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Electrical Metallic Tubing –
Steel

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UL Standard for Safety for Electrical Metallic Tubing – Steel, UL 797

Ninth Edition, Dated November 30, 2007

Summary of Topics

This is the Ninth Edition of UL 797, the common ANCE, CSA, and UL (trinational) standard for
Electrical Metallic Tubing – Steel, covering requirements for Mexico, Canada, and the United
States.

The revised requirements are substantially in accordance with UL’s Proposal(s) on this subject dated July
13, 2007.

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This Standard consists of pages dated as shown in the following checklist:

Page Date

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1-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . November 30, 2007

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No Text on This Page

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 National Association of Standardization and Certification of the
Electrical Sector
NMX-J-536-ANCE-2007
Second Edition

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Canadian Standards Association
CSA C22.2 No. 83.1-07
Second Edition

Underwriters Laboratories Inc.

UL 797
Ninth Edition

Electrical Metallic Tubing – Steel

November 30, 2007

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Commitment for Amendments

This standard is issued jointly by the Association of Standardization and Certification (ANCE), the
Canadian Standards Association (CSA) and Underwriters Laboratories Inc. (UL). Comments or

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proposals for revisions on any part of the standard may be submitted to ANCE, CSA, or UL at any time.
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Copyright © 2007 ANCE

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ISBN 978-1-55436-521-0
© 2007
Canadian Standards Association

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Proposals should be submitted via a Proposal Request in UL’s On-Line Collaborative Standards
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The most recent designation of ANSI/UL 797 as an American National Standard (ANSI) occurred on
November 27, 2007. The ANSI approval for this standard does not include the Cover Page, Transmittal
Pages, Title Page, or Preface.

This ANSI/UL Standard for Safety, which consists of the Ninth edition is under continuous maintenance,
whereby each revision is ANSI approved upon publication.

The Department of Defense (DoD) has adopted UL 797 on January 25, 1982. The publication of
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CONTENTS

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

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1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4 Units of measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.1 Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.2 Finished tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
5.3 Protective coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
5.4 Elbows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5.5 Expanded-end integral couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6 Test requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.1 Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.2 Protective coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
7 Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Annex A (normative)

A.1 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Annex B (informative)

B.1 Dimensions of EMT – Steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Annex C (informative)

C.1 Coating tests overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Annex D (informative)

D.1 Examination of finished product by manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Annex E (informative)

E.1 Alternative National Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

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Preface

This is the common ANCE, CSA, and UL standard for electrical metallic tubing – steel. It is the second
edition of NMX-J-536-ANCE-2007, the second edition of CSA C22.2 No. 83.1, and the ninth edition of UL

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797. This edition of CSA C22.2 No. 83.1 supersedes the previous edition published in 2004. This edition
of UL 797 supersedes the previous edition published June 30, 2004.

This common standard was prepared by the Association of Standardization and Certification (ANCE),
Canadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL), and the conduit
manufacturing industry. The efforts and support of the Technical Harmonization Subcommittee for Conduit
and Tubing, of the Council of the Harmonization of Electrotechnical Standards for the Nations of the
Americas (CANENA) are gratefully acknowledged.

This standard is considered suitable for use for conformity assessment within the stated scope of the
standard.

This standard was reviewed by the CSA Subcommittee on Metal Conduit and Tubing, under the
jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering
Committee on Requirements for Electrical Safety, and has been formally approved by the Technical
Committee.

This standard will be submitted to the Standards Council of Canada for approval as a National Standard
of Canada.

This standard has been approved by the American National Standards Institute as an American National
Standard.

Where reference is made to a specific number of samples to be tested, the specified number is to be
considered a minimum quantity.

Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains
the responsibility of the users of the standard to judge its suitability for their particular purpose.

Level of harmonization

This standard uses an IEC format, but is not based on, nor is it to be considered equivalent to an IEC
standard. This standard is published as an equivalent standard for ANCE, CSA, and UL. An equivalent
standard is a standard that is substantially the same in technical content, except as follows: Technical
deviations are allowed for codes and governmental regulations and those recognized as being in
accordance with NAFTA Article 905, for example, because of fundamental, climatic, geographical,
technological or infrastructural factors, scientific justification, or the level of protection that the country
considers appropriate. Presentation is to be word for word except for editorial changes.

Reasons for differences from IEC

The Technical Harmonization Subcommittee identified several IEC standards that address electrical
conduit and tubing included in the scope of this standard. The IEC standards for electrical conduit and
tubing are recognized as being generally system-specific, containing the requirements for the relevant
conduits, tubing, and associated fittings in several discrete IEC standards.

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The THSC determined the safe use of electrical conduit and tubing is dependent on the design and
performance of the conduit and tubing systems with which they are intended to be installed. Significant
investigation is required to assess safety and system compatibility issues that may lead to harmonization
of traditional North American electrical conduit and tubing and associated fittings with those presently

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addressed in the known IEC standards. The THSC agreed such future investigation might be facilitated
by completion of harmonization of the North American standards for electrical conduit and tubing and their
fittings.

Interpretations

The interpretation by the standards development organization of an identical or equivalent standard is to

be based on the literal text to determine compliance with the standard in accordance with the procedural
rules of the standards development organization. If more than one interpretation of the literal text has been
identified, a revision is to be proposed as soon as possible to each of the standards development
organizations to more accurately reflect the intent.

ANCE effective date

The effective date for ANCE will be announced through the Diario Oficial de la Federación (Official
Gazette) and is indicated on the cover page.

CSA effective date

The effective date for CSA International will be announced through CSA Informs or a CSA Certification
Notice.

UL effective date

As of November 30, 2007 all products Listed or Recognized by UL must comply with the requirements in
this standard.

A UL effective date is established by Underwriters Laboratories Inc. and is not part of the ANSI approved
standard.

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Electrical Metallic Tubing – Steel

1 Scope

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1.1 These requirements cover electrical metallic tubing – steel (EMT) and elbows for use as a metal
raceway for installation of wires and cables in accordance with CSA C22.1, Canadian Electrical Code,
Part 1, NOM-001-SEDE, Standard for Electrical Installations, and NFPA 70, National Electrical Code (see
Reference Item No. 1, Annex A). EMT is provided with a zinc, zinc-based, nonmetallic, or other alternate
corrosion-resistant exterior coating and an organic or zinc interior coating. It is the users’ responsibility to
determine the appropriate product for their application.

1.2 Aluminum electrical metallic tubing is covered by the standards listed in Reference Item No. 2, Annex
A.

2 Normative references

2.1 Products covered by this standard shall comply with the reference installation codes and standards
as appropriate for the country where the product is to be used. When the product is intended for use in
more than one country, the product shall comply with the installation codes and standards for all countries
where it is intended to be used. A ″Reference Item No.″ is provided at the point of use for each reference
in this standard. See Annex A for a list of reference publications and the correlating list of reference item
numbers to applicable country publications.

2.2 For undated references to standards, such reference shall be considered to refer to the latest edition
and all revisions to that edition up to the time when this standard was approved. For dated references to
standards, such reference shall be considered to refer to the dated edition and all revisions published to
that edition up to the time the standard was approved.

3 Definitions

3.1 The following definitions apply in this standard.

3.2 Coating(s), alternate corrosion-resistant. A primary coating(s) other than one consisting solely of
zinc, which upon evaluation has demonstrated the ability to provide the level of corrosion resistance
required on the exterior of tubing. See Clause 6.2.4.

Note: Coating(s) may include zinc.

3.3 Coating(s), organic. An interior coating(s), other than one consisting solely of zinc, which, upon
evaluation, has demonstrated the ability to provide the level of corrosion resistance necessary where
the coating is not subject to physical damage. See Clause 6.2.3.

Note: Coating(s) may include zinc.

3.4 Coating(s), zinc. A primary coating consisting solely of zinc, which, upon evaluation, has
demonstrated the ability to provide the level of corrosion resistance required on the exterior of the
tubing. See Clause 6.2.2.

3.5 Elbow. A manufactured curved section of EMT.

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3.6 Electrical metallic tubing – steel (EMT). An unthreaded steel raceway of circular cross-section
designed for the physical protection and routing of wire conductors and for use as an equipment
grounding conductor when installed utilizing appropriate fittings.

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3.7 Primary coating. A coating on the outside of the tubing for protection against corrosion. See
Clause 5.3.1.1.

3.8 Supplementary coating. A coating on the outside of the tubing in addition to the primary coating,
for protection against severe corrosive conditions. See Clause 5.3.5.

4 Units of measurement

4.1 In Canada and Mexico, the values given in SI (metric) units shall be normative. Any other values
given shall be for information purposes only.

In the United States, the values stated in either SI units or inch-pound units shall be regarded separately
as standard. The values stated in each system may not be exact equivalents; therefore, each system shall
be used independently of the other. Combining values from the two systems can result in nonconformance
with the standard.

5 Construction

5.1 Tube

5.1.1 Each tube shall be of steel, shall be straight, and shall have a circular cross-section. All seams shall
be thoroughly welded.

5.1.2 A welded seam shall not have metal trimmings, sharp edges, or sharp projections on the interior
or exterior surfaces of the tube. A slight bead on the interior wall at the weld line shall be allowed if the
bead is not sharp and if the bead does not exceed 0.38 mm (0.015 in) in height for the trade size 16 – 53
(1/2 – 2) or 0.51 mm (0.020 in) in height for the trade size 63 – 103 (2-1/2 – 4).

5.1.3 Before the protective coating is applied, the interior and exterior surfaces of each tube shall be free
from scale, flash, or any other protrusion, other than as specified in Clause 5.1.2.

5.1.4 The end of the tubing shall be cut off squarely and shall be without any burrs and sharp edges.

5.1.5 Electrical metallic tubing shall not be threaded unless the integral fittings mentioned in Clause 5.5
are steel, and the thread is not of the standard pipe-thread dimensions.

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5.2 Finished tubing

5.2.1 The outside diameter and the minimum weight of finished electrical metallic tubing shall be as
indicated in Table 5.1. The standard length of electrical metallic tubing shall be 3.05 m (10 ft) ±6 mm (±1/4

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in). Each length of EMT shall be examined visually on both exterior and interior surfaces to determine the
absence or presence of poor coatings, hard scale, burrs or fins, or other defects. See Annex D.

5.2.2 Lengths, other than standard lengths, shall have a minimum acceptable weight proportional to the
weights specified in Table 5.1. The length tolerances in Clause 5.2.1 shall be applicable for non-standard
lengths.

Table 5.1
Dimensions and Weights

Metric designator Outside diameter, Minimum Trade size Outside diameter, Minimum
mm acceptable weight, in acceptable weight,
kg/m lbs/ft
16 17.93 ± 0.13 0.424 1/2 0.706 ± 0.005 0.285
21 23.42 ± 0.13 0.647 3/4 0.922 ± 0.005 0.435
27 29.54 ± 0.13 0.952 1 1.163 ± 0.005 0.640
35 38.35 ± 0.13 1.414 1-1/4 1.510 ± 0.005 0.950
41 44.20 ± 0.13 1.637 1-1/2 1.740 ± 0.005 1.10
53 55.80 ± 0.13 2.083 2 2.197 ± 0.005 1.40
63 73.03 ± 0.25 3.051 2-1/2 2.875 ± 0.010 2.05
78 88.90 ± 0.38 3.720 3 3.500 ± 0.015 2.50
91 101.60 ± 0.50 4.837 3-1/2 4.000 ± 0.020 3.25
103 114.30 ± 0.50 5.506 4 4.500 ± 0. 020 3.70

5.2.3 Other dimensions of EMT complying with the requirements in this standard are provided in Annex
B for information only.

5.3 Protective coatings

5.3.1 General

5.3.1.1 The exterior surface of EMT shall be protected against corrosion by a coating solely of zinc, as
described in Clause 5.3.2, or an alternate corrosion-resistant coating, as described in Clause 5.3.3. The
interior surface of the tubing shall be protected against corrosion by a coating of zinc or an organic
coating, as described in Clauses 5.3.2 and 5.3.4 respectively. See Annex C for an overview.

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5.3.2 Zinc coating

5.3.2.1 A protective coating of zinc shall cover completely, shall adhere firmly at all points, shall be
smooth and free from blisters and other defects that can lessen the protective value of the coating, shall

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be in metal-to-metal contact with the steel, and shall comply with Clause 6.2.2.

5.3.3 Alternate corrosion-resistant coating

5.3.3.1 An alternate corrosion-resistant coating shall cover completely, shall adhere firmly at all points,
and shall be smooth and free from blisters and other defects that can lessen the protective value of the
coating.

5.3.3.2 An alternate corrosion-resistant coating shall comply with the requirements of Clause 6.2.4. The
tubing or elbow shall be subjected to the assembly, bending, resistance, pull, and fault current tests in
accordance with Reference Item No. 3, Annex A, with both set-screw and compression type couplings,
without removal of the alternate corrosion-resistant coating.

5.3.3.3 Tubing provided with a nonmetallic alternate corrosion-resistant coating that is not marked with a
temperature designation, or is marked ″90°C″ (“200°F”), is for use in ambient temperatures that do not
exceed 90°C (200°F). It is not prohibited that tubing provided with a nonmetallic alternate
corrosion-resistant coating that is for use at temperatures in excess of 90°C (200°F) be marked with a
rating that has been evaluated in accordance with Clause 6.2.4.4.1.

5.3.3.4 Tubing provided with a nonmetallic alternate corrosion-resistant coating that is not marked with a
temperature designation, or is marked ″0°C″ (“32°F”), is for use in ambient temperatures not below 0°C
(32°F). It is not prohibited that tubing provided with a nonmetallic alternate corrosion-resistant coating that
is for use at temperatures below 0°C (32°F) be marked with a rating that has been evaluated in
accordance with Clauses 6.2.1.3 and 6.2.4.10.

5.3.4 Organic coating

5.3.4.1 An organic coating shall cover evenly the surface to which it is applied, shall be of uniform quality
throughout, shall have a smooth and even appearance, and shall comply with Clause 6.2.3 and the
bending requirements of Clause 6.2.1.1.

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5.3.5 Supplementary coating

5.3.5.1 The use of one or more supplementary coatings is not prohibited. The supplementary coating or
coatings are not required to meet the requirements for primary corrosion-resistant coatings. Tubing or

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elbows that are provided with supplementary coatings that have not been evaluated for their corrosion
resistance characteristics shall be marked in accordance with Clause 7.7.

5.3.5.2 Supplementary nonmetallic coatings shall be evaluated with respect to:

a) flame propagation,

b) detrimental effects on the corrosion resistance provided by the primary protective coatings,

c) the fit of the couplings, and

d) electrical continuity with couplings.

See Reference Item No. 4, Annex A. The supplementary coating shall be provided in addition to the full
primary corrosion-resistant coating.

5.3.6 Surface treatment

5.3.6.1 When one or more surface treatments not exceeding 0.0038 mm (0.00015 in) are employed as a
top coat or conversion coating, the coatings shall not be required to meet the requirements for an alternate
corrosion-resistant coating or organic coating.

5.4 Elbows

5.4.1 Elbows shall be made from the same grade of tubing as that used for straight lengths of EMT and
shall be treated, coated, and otherwise produced according to the requirements for EMT. See Annex D.

5.4.2 An elbow may be provided with an integral coupling or other integral fitting on one or both ends.
Each fitting shall comply with Reference Item No. 5, Annex A.

5.4.3 No elbow shall be sharper than 90 degrees. Tolerances for elbows shall be plus or minus 2
degrees. For each size of tubing, the radius R and the length Ls of the straight portions at the ends of an
elbow shall not be smaller than indicated in Table 5.2. See Figure 1 for illustration.

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Table 5.2
Minimum Dimensions of Elbows

Metric Designator Radius R to Length Ls of Each Trade Size Radius R to Length Ls of Each

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Centerline of Straight End Centerline of Straight End
Tubing, Portion of Tubing, Tubing, Portion of Tubing,
mm mm in in
16 102 38 1/2 4 1-1/2
21 114 38 3/4 4-1/2 1-1/2
27 146 48 1 5-3/4 1-7/8
35 184 51 1-1/4 7-1/4 2
41 210 51 1-1/2 8-1/4 2
53 241 51 2 9-1/2 2
63 267 76 2-1/2 10-1/2 3
78 330 79 3 13 3-1/8
91 381 83 3-1/2 15 3-1/4
103 406 86 4 16 3-3/8

5.5 Expanded-end integral couplings

5.5.1 Electrical metallic tubing may be provided with an integral fitting such as an expanded end. Each
such fitting shall comply with the relevant standard for fittings for conduit, tubing, and cable in Reference
Item No. 6, Annex A.

6 Test requirements

6.1 Tube

6.1.1 At ambient temperature, one specimen of the smallest available trade size of EMT shall be capable
of being bent into a quarter of a circle, without the formation of any cracks in the metal, the opening of
seam or weld, or the appreciable distortion of the circular cross-section of the tube. Compliance of tubing
with this requirement regarding cracks and openings shall be determined, after bending, by subjecting the
tubing to a visual examination.

6.1.2 After being conditioned at a temperature of 0°C (32°F) for 60 min, one specimen of the smallest
available trade size of finished tube shall be capable of being bent into a quarter of a circle around a
mandrel. The same specimen may also be used to determine compliance with the coating test in Clause
6.2.1.3. Compliance shall be determined by bending the tube with the test apparatus as shown in Figure
2 with a radius as described in Table 5.2. The tube shall not develop a crack and the weld shall not open.
The test shall be conducted inside the cold chamber or shall begin within 15 s of removal from the cold
chamber. Tubing that is provided with a nonmetallic alternate corrosion-resistant coating and that is
marked with a temperature rating below ″0°C″ (″32°F″) shall be conditioned at the rated temperature. The
rated temperature shall be any temperature below 0°C (32°F) in 5°C (9°F) increments.

6.1.3 Compliance of trade sizes 16 (1/2), 21 (3/4), and 27 (1) EMT with the requirements in Clauses 6.1.1
and 6.1.2 shall be determined by bending the tube with the test apparatus as shown in Figure 2 with a
radius as described in Table 5.2. Compliance of EMT larger than trade size 27 (1) with the requirements
in Clauses 6.1.1 and 6.1.2 shall be determined by bending the tube with any suitable bending equipment
that has a radius as described in Table 5.2.

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6.2 Protective coatings

6.2.1 General

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6.2.1.1 The protective coating used on the interior or exterior of the tubing shall not crack or flake, as
visible using normal or corrected to normal vision, when a finished specimen of the smallest available
trade size produced by the manufacturer is tested at ambient temperature. Testing shall be performed by
bending the tubing into a semi-circle, the centerline of which has a radius as described in Table 5.2.

6.2.1.2 Compliance of trade sizes 16 (1/2), 21 (3/4), and 27 (1) EMT with the requirement in Clause
6.2.1.1 shall be determined by bending the tube with the test apparatus as shown in Figure 2. Compliance
of EMT larger than trade size 27 (1) with the requirement in Clause 6.2.1.1 shall be determined by bending
the tube with any suitable bending equipment.

6.2.1.3 One specimen of the smallest available trade size of finished tube shall be capable of being bent
into a quarter of a circle around a mandrel after being conditioned at a temperature of 0°C (32°F) for 60
min. Compliance shall be determined by bending the tube with the test apparatus as shown in Figure 2
with a radius as described in Table 5.2. The coatings shall not be damaged to the extent that bare metal
is exposed or that the coating separates from the metal. The test shall be conducted inside the cold
chamber or begun within 15 s of removal from the cold chamber. Tubing that is provided with a
nonmetallic alternate corrosion-resistant coating and that is marked with a temperature rating below ″0°C″
(″32°F″) shall be conditioned at the rated temperature. The rated temperature shall be any temperature
below 0°C (32°F) in 5°C (9°F) increments.

6.2.1.4 For identification of compounds, a nonmetallic material used as an alternate corrosion-resistant

or organic coating shall be subjected to the infrared spectroscopy (IR), thermogravimetric analysis (TGA),
and differential scanning calorimetry (DSC) tests specified in the applicable standard for polymeric
materials. See Reference Item No. 7, Annex A.

6.2.2 Zinc coating

6.2.2.1 A solution of copper sulfate for this test shall be made from distilled water and a reagent grade of
cupric sulfate (CuSO4). In a copper container or in a glass, polyethylene, or other chemically nonreactive
container in which a bright piece of copper is present, a quantity of the cupric sulfate shall be dissolved
in hot distilled water. The purpose is to obtain a solution that has a specific gravity slightly higher than
1.186 after the solution is cooled to a temperature of 18.3°C (65.0°F). Any free acid that might be present
shall be neutralized by the addition of approximately 1 gram of cupric oxide (CuO) or 1 gram of cupric
hydroxide (Cu(OH)2) per liter of solution. The solution shall then be diluted with distilled water to obtain a
specific gravity of exactly 1.186 at a temperature of 18.3°C (65.0°F). The solution shall then be filtered.

6.2.2.2 Several 150-mm (6-in) specimens shall be cut from a sample length of the finished zinc-coated
tubing. With prudent attention to the risks to health and to the risk of fire, the specimens shall be cleaned
with a suitable organic solvent. Each specimen shall be examined for evidence of damage to the zinc
coating, and only specimens that are not damaged shall be selected for use in the test. When a zinc
coating is used on the inside and outside of the tubing, half of the specimens shall be longitudinally cut
in half to expose the inside surface. If a zinc coating is used only on the outside of the tubing, none of the
specimens shall be cut longitudinally.

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6.2.2.3 The selected specimens shall be rinsed in water, and all surfaces shall be dried with clean
cheesecloth. As much of the water as possible shall be removed in the drying operation because water
slows the reaction between the zinc and the solution, thereby adversely affecting the test results. The
surface of the zinc shall be dry and clean before a specimen is immersed in the solution of copper sulfate.

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The specimens shall not be touched by the hands or anything else that can contaminate or damage the
surfaces.

6.2.2.4 A glass, polyethylene, or other chemically nonreactive beaker having a diameter equal to
approximately twice the diameter measured over the specimen shall be filled with the solution of copper
sulfate to a depth of not less than 76 mm (3 in). The temperature of the solution shall be maintained at
18.3 ±1.1°C (65.0 ±2.0°F). The specimen shall be immersed in the solution and supported on end in the
center of the beaker so that not less than 64 mm (2-1/2 in) of its length is immersed. The specimen shall
remain in the solution for 60 s, during which time it shall not be moved, nor shall the solution be stirred.

6.2.2.5 At the end of the 60 s period, the specimen shall be removed from the beaker, rinsed immediately
in running tap water, rubbed with clean cheesecloth until any loosely adhering deposits of copper are
removed, and then dried with clean cheesecloth. Again, hands and other damaging and contaminating
objects and substances shall not touch the surfaces that were immersed. The part of the specimen that
was immersed shall be examined, considering each broad surface separately and disregarding the
portions of the specimen within 13 mm (1/2 in) of the cut ends on sizes 12 – 53 (3/8 – 2) and 25 mm (1
in) for sizes 63 – 103 (2-1/2 – 4) and within 3 mm (1/8 in) of any longitudinal edges cut in the process of
preparing the specimen.

6.2.2.6 A record shall be made when the immersed part of the specimen has any deposit of bright,
firmly-adhering copper exclusive of the 13 mm (1/2 in) cut-end portions and any 3 mm (1/8 in) longitudinal
cut-edge portions.

6.2.2.7 When bright adhering copper is not found, the process of immersing, washing, rubbing, drying,
examining, and recording shall be repeated up to the required number of immersions, or until the
presence of copper is noted, whichever comes first, using the same specimen and beaker of solution.
After the dips are completed on any one specimen, the portion of the solution of copper sulfate used shall
be discarded. A fresh portion of the solution shall be employed for each of any succeeding specimens.

6.2.2.8 A protective zinc coating that provides the sole means of primary corrosion resistance on the
exterior of the tubing shall be such that a specimen of the finished tubing does not show a bright, adherent
deposit of copper after four 60-s immersions in a copper sulfate solution.

6.2.2.9 A protective zinc coating that provides the sole means of primary corrosion resistance on the
interior of the tubing shall be such that a specimen of the finished tubing does not show a bright, adherent
deposit of copper after one 60-s immersion in a copper sulfate solution.

6.2.2.10 When it is desired to show the character of the bright metallic copper deposit on an exposed
steel surface, prepare a reference standard for comparison as follows. Partially submerge a zinc-coated
specimen in strong hydrochloric acid until a violent action ceases. Immediately remove the specimen,
wash, and wipe it dry. Then dip the specimen, with an area of bare surface thus exposed, including a
portion with zinc coating intact, for a few seconds in the copper sulfate solution at a temperature of 16 –
20°C (61 – 66°F), remove it, wash it, and wipe it dry. Prepare this copper-coated reference standard at
the time of testing.

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6.2.2.11 For an alternate test method to the one described in Clauses 6.2.2.1 – 6.2.2.10, see Reference
Item No. 8, Annex A.

6.2.3 Organic coatings

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6.2.3.1 Elasticity test

6.2.3.1.1 The organic coating used to protect the interior of the tubing, when applied to a sheet-steel test
piece and baked in an oven for 5 h, shall withstand without damage 10 successive bends of the test piece
back and forth through an angle of 180 degrees against an edge having a radius of 1.6 mm (1/16 in).

6.2.3.1.2 The apparatus shall consist of flat test pieces of sheet steel 75 by 125 mm (3 by 5 in) long and
approximately 0.25 mm (0.010 in) thick, an oven for baking the test pieces, and a vise with jaws at least
75 mm (3 in) wide for holding the test pieces during the bending test. The 75-mm (3-in) edge of each jaw
shall be rounded to a radius of 1.6 mm (1/16 in).

6.2.3.1.3 Two test pieces shall be cleaned with a suitable organic solvent to remove any grease and
foreign material and shall then be dipped in the organic coating. After air drying for 30 min, the test pieces
shall be suspended by means of short wires in the oven. The test pieces shall be baked for 5 h at the
normal baking temperature for the coating in question, but if the normal baking temperature is lower than
135°C (275°F) or if the coating is regularly air dried, the oven temperature shall be maintained at 135 –
150°C (275 – 302°F).

6.2.3.1.4 At the end of the 5 h, the test pieces shall be removed from the oven and cooled in still air to
room temperature. Each flat test piece shall be secured in the vise, gripped at its free end, and then bent
for 90 degrees against one of the 75-mm (3-in) edges of the vise jaws. Each test piece shall then be bent
back past its original position, through 180 degrees, so that it ends bent 90 degrees against the other
75-mm (3-in) edge of the vise jaws. It shall then be bent for 90 degrees in the opposite direction, ending
with the test piece in its original position. This cycle shall be repeated 5 times. The organic coating shall
not be accepted if the coating on any test piece cracks, flakes off, or is damaged otherwise.

6.2.3.2 Warm humid air test

6.2.3.2.1 The test apparatus shall be an insulated specimen chamber with inside dimensions
approximately 119 by 71 by 71 cm (47 by 28 by 28 in). It shall contain a temperature-controlled water
reservoir, pump, and spray chamber for humidifying the air, an air-circulating fan, provision for heating the
air, specimen supports, and the necessary means of control.

6.2.3.2.2 The dry bulb temperature of the test chamber shall be maintained at 60 ±1°C (140 ±2°F) and at
98 ±2% relative humidity throughout the test. The specimens shall be supported in racks at an angle of
15 degrees from the vertical.

6.2.3.2.3 The test shall be conducted for a period of 60 d, at the end of which there shall not be any
corrosion of the metal.

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6.2.4 Alternate corrosion-resistant coatings

6.2.4.1 A coating other than one consisting solely of zinc, which is to be evaluated for its ability to provide
corrosion resistance on the exterior of tubing, shall, in addition to the requirements in Clauses 6.2.4.2 –

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6.2.4.7.3, be evaluated with respect to flame propagation. See Clause 6.2.4.11. Additionally the tubing or
elbow shall be subjected to the assembly, bending, resistance, pull, and fault current tests in accordance
with Reference Item No. 9, Annex A, with both set-screw and compression-type couplings.

6.2.4.2 The coating shall comply with the salt-spray (fog), moist carbon dioxide-sulfur dioxide-air, and
ultraviolet light and water tests after being conditioned in accordance with Clause 6.2.4.4. Corrosion within
13 mm (1/2 in) of cut edges shall be disregarded.

6.2.4.3 Preparation of specimens

6.2.4.3.1 Thirty 152 – 203 mm (6 – 8 in) long specimens, provided with the corrosion-resistant coating, of
trade size 2 (53), or the closest trade size manufactured, shall be tested.

6.2.4.3.2 Half of the specimens to be exposed shall be scribed using a rotary tool operating at a speed
of 15,000 – 30,000 rpm. The specimens shall be scribed in accordance with Figure 3 using a 1.14 mm
(0.045 in) thick fiberglass reinforced cut-off wheel until bright base metal is exposed. The specimens shall
be free of grease or dirt. The coating thickness of each specimen shall be measured prior to exposing it
to the test environments.

6.2.4.4 Air oven conditioning exposure

6.2.4.4.1 Six scribed and six unscribed specimens of each coating shall be conditioned for 240 h at a
temperature of 100 ±1°C (212 ±2°F) in an air-circulating oven. Tubing that is marked with a temperature
rating above 90°C (200°F) shall be conditioned at the rated temperature plus 10°C (18°F), for which the
rated temperature shall be any temperature in excess of 90°C (200°F) at 25°C (45°F) increments. These
specimens shall be used for the resistance to salt spray (fog) (Clauses 6.2.4.6.1 and 6.2.4.6.2) and the
resistance to moist carbon dioxide-sulfur dioxide-air (Clauses 6.2.4.7.1 – 6.2.4.7.3) tests.

6.2.4.5 Resistance to ultraviolet light and water

6.2.4.5.1 Three scribed and three unscribed specimens shall be exposed to ultraviolet light and water by
either of the methods specified in Clause 6.2.4.5.3 or 6.2.4.5.4.

6.2.4.5.2 As a result of the exposure, the unscribed specimens shall not show any base metal corrosion
or any blisters. For the scribed specimens, the average creeping distance of red rust from the scribe shall
not be greater than Rating No. 6 (1.6 – 3.2 mm (1/16 – 1/8 in)) as designated in Reference Item No. 10,
Annex A, with maximum isolated spot not exceeding 9.5 mm (3/8 in). There shall not be any visual
evidence of pitting of the substrate and only the beginning of a buildup of red rust beneath the coating
uplifted from the scribe.

6.2.4.5.3 For twin enclosed carbon-arc, the specimens shall be exposed for 360 h to light and water in
accordance with Reference Item No. 11, Annex A, using the apparatus designated as type DH. Method
1, continuous exposure to light and intermittent exposure to water spray, with a programmed cycle of 120
min consisting of a 102-min light exposure and an 18-min exposure to water spray with light, shall be
used. The apparatus shall operate with a black-panel temperature of 63 ±3°C (145 ±5°F).

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6.2.4.5.4 For xenon-arc, the specimens shall be exposed for 500 h to light and water in accordance with
Reference Item No. 12, Annex A, using the apparatus designated as type BH. Test Method A, continuous
exposure to light and intermittent exposure to water spray, with a programmed cycle of 120 min consisting
of a 102-min light exposure and an 18-min exposure to water spray with light, shall be used. The

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apparatus shall operate with a 6500 W, water-cooled xenon-arc lamp, borosilicate glass inner and outer
optical filters, a spectral irradiance of 0.35 W/m2/nm at 340 nm, and a black-panel temperature of 63 ±3°C
(145 ±5°F).

6.2.4.6 Resistance to salt spray (fog)

6.2.4.6.1 Six as-received and six air-oven conditioned specimens shall be exposed to the salt spray (fog)
for 600 h in accordance with Reference Item No. 13, Annex A. Three of the as-received and three of the
air-oven conditioned specimens shall be scribed as described in Clause 6.2.4.3.2.

6.2.4.6.2 As a result of the conditioning, the unscribed specimens shall not show more than a light
corrosion beneath the coating system, with no visible pitting of the substrate and only the beginning of a
buildup or weeping of red rust. For the scribed specimens, the average creeping distance of red rust from
the scribe shall not be greater than Rating No. 5 (3.2 – 4.8 mm (1/8 – 3/16 in)) as designated in Reference
Item No. 14, Annex A, with maximum isolated spot not exceeding 9.5 mm (3/8 in). There shall not be any
separation of the coating from the substrate as a result of the exposure.

6.2.4.7 Resistance to moist carbon dioxide-sulfur dioxide-air

6.2.4.7.1 Six as-received and six air-oven conditioned specimens shall be exposed to the moist carbon
dioxide-sulfur dioxide-air for 1200 h. The apparatus used for this exposure shall consist of a chamber
having a volume of at least 0.085 m3 (3 ft3) with a water jacket and thermostatically controlled heater to
maintain a temperature of 35 ±2°C (95 ±3°F). Three of the as-received and three of the air-oven
conditioned specimens shall be scribed as described in Clause 6.2.4.3.2.

6.2.4.7.2 As a result of the conditioning, the unscribed specimens shall not show more than a light
corrosion beneath the coating system, with no visible pitting of the substrate and only the beginning of a
buildup or weeping of red rust. For the scribed specimens, the average creeping distance of red rust from
the scribe shall not be greater than Rating No. 6 (1.6 – 3.2 mm (1/16 – 1/8 in)) as designated in Reference
Item No. 15, Annex A, with maximum isolated spot not exceeding 9.5 mm (3/8 in). There shall not be any
separation of the coating from the substrate as a result of the exposure.

6.2.4.7.3 The carbon dioxide and sulfur dioxide shall be supplied to the test chamber from commercial
cylinders containing the gases under pressure. An amount of carbon dioxide equivalent to 1 percent of
the volume of the test chamber and an equal volume of sulfur dioxide shall be introduced into the chamber
each working day. Prior to introducing the new charge of gas each day, the remaining gas-air mixture from
the previous day shall be purged from the chamber. A small amount of water shall be maintained at the
bottom of the chamber for humidity. This water shall not be changed during the exposure. The specimens
shall be supported in plastic racks at an angle of 15 degrees from the vertical.

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6.2.4.8 Tensile strength

6.2.4.8.1 PVC alternate corrosion-resistant coatings shall have a minimum tensile strength of 13.79 MPa
(2000 psi) when tested in accordance with Reference Item No. 16, Annex A. Other materials shall be

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subject to special investigation.

6.2.4.9 Adhesion

6.2.4.9.1 The adhesion of an alternate corrosion-resistant coating that is 0.51 – 1.27 mm (0.020 – 0.050
in) thick shall be greater than the strength of the alternate corrosion-resistant coating itself. This shall be
determined by making two 38-mm (1-1/2-in) circumferential cuts 13 mm (1/2 in) apart through the
alternate corrosion-resistant coating to the substrate. A third cut shall be made perpendicular to, and
crossing, the circumferential cuts. The edge of the alternate corrosion-resistant coating shall be carefully
lifted with a knife to form a tab. This tab shall be pulled perpendicular to the tubing with a pair of pliers.
The tab shall tear rather than any additional alternate corrosion-resistant coating separating from the
substrate.

6.2.4.9.2 The adhesion of an alternate corrosion-resistant coating that is 0.127 mm (0.005 in) thick or less
shall be determined in accordance with the relevant standard referenced in Reference Item No. 17, Annex
A.

6.2.4.9.3 The adhesion of an alternate corrosion-resistant coating, other than as specified in Clause
6.2.4.9.1 or 6.2.4.9.2, shall be determined by special investigation.

6.2.4.10 Cold impact

6.2.4.10.1 Ten 152 – 203 mm (6 – 8 in) specimens of finished tubing provided with a nonmetallic alternate
corrosion-resistant coating shall be conditioned at a temperature of 0°C (32°F) for a period of 60 min.
Tubing that is marked with a temperature rating below 0°C (32°F) shall be conditioned at the rated
temperature, for which the rated temperature shall be any temperature below 0°C (32°F) in 5°C (9°F)
increments. The specimens shall then be subjected to an impact of 12.2 J (9 ft-lb) in accordance with
Clause 6.2.4.10.2. The coating shall not separate from the metal nor be damaged to the extent that bare
metal is exposed.

6.2.4.10.2 The impact test described in Clause 6.2.4.10.1 shall be performed using the Tup B falling mass
and the apparatus and method specified in Reference Item No. 18, Annex A. The test shall be conducted
inside the cold chamber or within 15 s of removal from the cold chamber.

6.2.4.10.3 Alternatively, a combination of any height and weight that results in the same impact force
specified in Clause 6.2.4.10.1 may be used when the impact face remains unchanged.

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6.2.4.11 Flammability

6.2.4.11.1 Vertical specimens of finished tubing provided with a nonmetallic alternate corrosion-resistant
coating shall not flame for longer than 5 s following any of three 60-s applications of flame, the period

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between applications being 30 s. A specimen shall not:

a) Emit flaming or glowing particles or flaming drops at any time that ignite the cotton on the
burner, wedge, or floor of the enclosure (flameless charring of the cotton shall be ignored),

b) Continue to flame longer than 5 s after any application of the gas flame, or

c) Have the coating consumed during or after any application of the gas flame.

6.2.4.11.2 This test shall be performed on 3 unaged specimens tested separately, with each positioned
in a 3-sided metal enclosure in an exhaust hood or cabinet. The metal enclosure shall be 305 mm (12 in)
wide, 355 mm (14 in) deep, and 610 mm (24 in) high, and the top and front shall be open. A 457-mm
(18-in) specimen of finished tubing shall be secured with its longitudinal axis vertical in the center of the
enclosure. A flat, horizontal layer of untreated surgical cotton 6 – 25 mm (1/4 – 1 in) thick shall cover the
floor of the enclosure. The upper surface of the cotton shall be 229 – 241 mm (9 – 9-1/2 in) below point
B, which is the point at which the tip of the blue inner cone of the test flame touches the specimen. (This
is shown in Figure 4.)

6.2.4.11.3 The burner shall conform to Reference Item No. 19, Annex A, having a bore of 9.5 ±0.3 mm
and a length of 100 ±10 mm from the top of the air inlet openings to the top of the mixing tube, or shall
be an equivalent that meets the calibration requirements of Reference Item No. 20, Annex A. While the
barrel is vertical and the burner is well away from the specimen, the overall height of the flame shall be
adjusted to approximately 100 – 125 mm (4 – 5 in). The blue inner cone shall be 38 mm (1-1/2 in) high
and the temperature at its tip shall be 816°C (1500°F) or higher as measured using a chromel-alumel
(nickel-chromium and nickel-manganese-aluminum) thermocouple. Without disturbing the adjustments for
the height of the flame, the valve supplying gas to the burner flame and the separate valve supplying gas
to any pilot flame shall be closed.

6.2.4.11.4 The gas supply used to supply the burner of Clause 6.2.4.11.3 shall be bottled, technical grade
methane or natural gas, approximately 37 MJ/m3 (1000 Btu/ft3) at normal pressure, with a suitable
regulator and meter for uniform gas flow.

6.2.4.11.5 A wedge, as shown in Figure 5, to which the base of the burner can be secured, shall be
provided for tilting the barrel 20 degrees from the vertical while the longitudinal axis of the barrel remains
in a vertical plane. The burner shall be secured to the wedge and the assembly shall be placed in an
adjustable support jig. A layer of untreated surgical cotton 6 – 25 mm (1/4 – 1 in) thick shall be placed on
the wedge and around the base of the burner. The jig shall be adjusted toward one side or the other of
the enclosure to place the longitudinal axis of the barrel in the vertical plane that contains the longitudinal
axis of the specimen. The plane shall be parallel to the sides of the enclosure. The jig shall be adjusted
toward the rear or front of the enclosure to position the point A, which is the intersection of the longitudinal
axis of the barrel with the plane of the tip of the barrel, 38 mm (1-1/2 in) from the point B at which the
extended longitudinal axis of the barrel meets the outer surface of the specimen. Point B is the point at
which the tip of the blue inner cone touches the center of the front of the specimen. The specimen shall
be adjusted vertically to keep point B from being any closer than 76 mm (3 in) to the lower clamp or other
support for the specimen.

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6.2.4.11.6 In the absence of a gas pilot light on the burner, the support for the burner and wedge shall be
arranged to enable the burner to be quickly removed from and precisely returned to the position described
in Clause 6.2.4.11.5 without disturbing the layer of cotton on the floor of the enclosure or the cotton on
the wedge and around the base of the burner.

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6.2.4.11.7 In instances where the burner has a gas pilot light, the valve supplying gas to the pilot shall be
opened and the pilot lit. Where the burner does not have a gas pilot light, the burner shall be supported
as indicated in Clause 6.2.4.11.6 in a position away from the specimen and then lit. This operation, and
the remainder of the test, shall be conducted under a forced-draft exhaust hood or cabinet operating to
remove smoke and fumes without drafts that affect the flame.

6.2.4.11.8 When the burner has a gas pilot light, the valve supplying gas to the burner shall be opened
to apply the flame to the specimen automatically. This valve shall be held open for 60 s and then closed
for 30 s. This procedure shall be repeated twice for a total of 3 applications of flame to the specimen.

7 Markings

Advisory Note: In Canada, there are two official languages, English and French. Annex E provides translations of
the markings specified in this Standard. All markings required by this Standard may be in other languages to
conform with the language requirements where the product is to be used.

7.1 Each finished straight length of EMT and each factory elbow shall be marked with the manufacturer’s
name, the trade name for the product, or both, or any other distinctive marking by means of which the
organization responsible for the product can readily be identified.

7.2 In the United States, when the tubing and elbows are produced in more than one factory, each
finished length of tubing and each elbow shall have a distinctive marking by means of which it can be
identified as the product of a particular factory. This marking may be in code.

In Canada and Mexico, this requirement does not apply.

7.3 Each straight length of tubing and each elbow shall be legibly marked ″Electrical Metallic Tubing″ or
″EMT″ by a durable means such as by die stamping, ink stamping with etching ink, or paint. This marking
shall be in letters at least 3 mm (1/8 in) high.

7.4 Each finished length of tubing or elbow shall be legibly and durably marked ″Consult manufacturer
for proper installation″ or equivalent wording.

7.5 Tubing provided with a nonmetallic alternate corrosion-resistant coating shall be allowed to be
marked with a maximum use temperature of ″90°C″ (″200°F″). Tubing tested for use at maximum ambient
temperature higher than 90°C (200°F) shall be marked ″____°C″ (″____°F″) with the rated temperature
as evaluated in Clause 6.2.4.4.1. The tubing shall be marked at a minimum of once every 3.05 m (10 ft)
and no less than once every piece.

7.6 Tubing provided with a nonmetallic alternate corrosion-resistant coating shall be allowed to be
marked with a minimum use temperature of ″0°C″ (″32°F″). Tubing tested for use at a minimum ambient
temperature below 0°C (32°F) shall be marked ″____°C″ (″____°F″) with the rated temperature as
evaluated in Clause 6.2.1.3. The tubing shall be marked at a minimum of once every 3.05 m (10 ft) and
no less than once every piece.

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7.7 Tubing or elbows provided with a supplementary coating or coatings that have not been evaluated for
furnishing corrosion protection for the tube shall be marked ″Corrosion protection properties of the
_____________ coating were not investigated″ or equivalent wording. The blank shall be filled in with the
type of supplementary coating.

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This is generated text for figtxt.

Figure 1
EMT elbows
(See Clause 5.4.3)

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Figure 2
Test apparatus for bending EMT
(See Clauses 6.1.2, 6.1.3, 6.2.1.2, and 6.2.1.3)

MR. H KHALIL || Purchased On : 2/28/2010 11:17:05 PM || Order Number : 100228103 || Document : 1 of 1 || ALL RIGHTS RESERVED
Figure 3
Scribe pattern
(See Clause 6.2.4.3.2)

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Figure 4
Essential dimensions for flame test
(See Clause 6.2.4.11.2)

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Figure 5
Dimensions of wedge in mm (inches)
(See Clause 6.2.4.11.5)

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Annex A (normative)

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A.1 Normative references

(See Clause 2.1)

Reference item Clause where United States Canada Mexico

no. referenced
1 1.1 NFPA 70-2005,National CSA C22.1-06, Part 1, NOM-001-SEDE, Standard
Electrical Code Canadian Electrical for Electrical Installations
Code
2 1.2 UL 797A Electrical CSA C22.2 No. NMX-576-ANCE-2005,
Metallic Tubing – 83-M1985 (R2003), Aluminum Rigid Conduit
Aluminum Electrical Metallic Tubing for Electrical Conductor
Protection and Fittings
3 5.3.3.2 UL 514B Conduit, C22.2 No. 18.3-04, NMX-J-017-ANCE-2005,
Tubing and Cable Conduit, Tubing and Conduit, Tubing and Cable
Fittings Cable Fittings Fittings – Specifications
and Test Methods
4 5.3.5.2 UL 746A Polymeric CAN/CSA C22.2 No. NMX-J-023/1-ANCE-2000,
Materials – Short Term 0.17-00 Electrical Products –
Property Evaluations, (R2004)Evaluation of Metallic Outlet Boxes Part
and UL 514B Conduit, Properties of Polymeric 1: Specifications and Test
Tubing and Cable Materials; and CSA Methods and NMX-J-017-
Fittings C22.2 No. 18.3-04, ANCE , Conduit, Tubing
Conduit, Tubing and and Cable Fittings –
Cable Fittings Specifications and Test
Methods
5 5.4.2 UL 514B Conduit, CSA C22.2 No. 18.3-04, NMX-J-017-ANCE-2005,
Tubing and Cable Conduit, Tubing and Conduit, Tubing and Cable
Fittings Cable Fittings Fittings – Specifications
and Test Methods
6 5.5.1 UL 514B Conduit, CSA C22.2 No. 18.3-04, NMX-J-017-ANCE-2005,
Tubing and Cable Conduit, Tubing and Conduit, Tubing and Cable
Fittings Cable Fittings Fittings – Specifications
and Test Methods
7 6.2.1.4 UL 746A Polymeric CAN/CSA C22.2 No. NMX-J-023/1-ANCE-2000,
Materials – Short Term 0.17-00 (R2004), Electrical Products –
Property Evaluations Evaluation of Properties Metallic Outlet Boxes Part
of Polymeric Materials 1: Specifications and Test
Methods
8 6.2.2.11 ASTM A 239-95 (2004), ASTM A 239-95 (2004), NMX-H-013-1984, Coating
Standard Practice for Standard Practice for – Zinc – Locating the
Locating the Thinnest Locating the Thinnest Thinnest Spot on
Spot in a Zinc Spot in a Zinc Galvanized Steel Articles –
(Galvanized) Coating (Galvanized) Coating on Test Method (Preece Test)
on Iron or Steel Articles Iron or Steel Articles
9 6.2.4.1 UL 514B Conduit, CSA C22.2 No. 18.3-04, NMX-J-017-ANCE-2005,
Tubing and Cable Conduit, Tubing and Conduit, Tubing and Cable
Fittings Cable Fittings Fittings – Specifications
and Test Methods

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Table Continued

Reference item Clause where United States Canada Mexico

no. referenced

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10 6.2.4.5.2 ASTM D 1654-05, ASTM D 1654-05, NMX-J-023/1-ANCE-2000,
Procedure A, Method 2, Procedure A, Method 2, Electrical Products –
Standard Test Method Standard Test Method Metallic Outlet Boxes Part
for Evaluation of for Evaluation of Painted 1: Specifications and Test
Painted or Coated or Coated Specimens Methods
Specimens Subjected Subjected to Corrosive
to Corrosive Environments
Environments
11 6.2.4.5.3 ASTM G 153-04, ASTM G 153-04, NMX-J-023/1-ANCE-2000,
Standard Practice for Standard Practice for Electrical Products –
Operating Enclosed Operating Enclosed Metallic Outlet Boxes Part
Carbon Arc Light Carbon Arc Light 1: Specifications and Test
Apparatus for Exposure Apparatus for Exposure Methods
of Nonmetallic Materials of Nonmetallic Materials
12 6.2.4.5.4 ASTM G 155-05, Cycle ASTM G 155-05, Cycle NMX-J-023/1-ANCE-2000,
1, Standard Practice for 1, Standard Practice for Electrical Products –
Operating Xenon Arc Operating Xenon Arc Metallic Outlet Boxes Part
Light Apparatus for Light Apparatus for 1: Specifications and Test
Exposure of Non- Exposure of Non-Metallic Methods
Metallic Materials Materials
13 6.2.4.6.1 ASTM B 117-03, ASTM B 117-03, NMX-D-022-1973, Method
Standard Practice for Standard Practice for of Test for Corrosion –
Operating Salt Spray Operating Salt Spray Resistance of Coated
(Fog) Apparatus (Fog) Apparatus Metal Parts Used in Motor
Vehicles Salt Spray (Fog)
Method
14 6.2.4.6.2 ASTM D 1654-05, ASTM D 1654-05, NMX-J-023/1-ANCE-2000,
Procedure A, Method 2, Procedure A, Method 2, Electrical Products –
Standard Test Method Standard Test Method Metallic Outlet Boxes Part
for Evaluation of for Evaluation of Painted 1: Specifications and Test
Painted or Coated or Coated Specimens Methods
Specimens Subjected Subjected to Corrosive
to Corrosive Environments
Environments
15 6.2.4.7.2 ASTM D 1654-05, ASTM D 1654-05, NMX-J-023/1-ANCE-2000,
Procedure A, Method 2, Procedure A, Method 2, Electrical Products –
Standard Test Method Standard Test Method Metallic Outlet Boxes Part
for Evaluation of for Evaluation of Painted 1: Specifications and Test
Painted or Coated or Coated Specimens Methods
Specimens Subjected Subjected to Corrosive
to Corrosive Environments
Environments
16 6.2.4.8.1 ASTM D 638-03, ASTM D 638-03, NMX-E-082-2002, Plastic
Standard Test Method Standard Test Method Industry-Tensile Strength
for Tensile Properties of for Tensile Properties of of Plastic Materials-Test
Plastics Plastics Methods
17 6.2.4.9.2 ASTM D 3359-02, ASTM D 3359-02, NMX-H-013-1984, Coating
Standard Test Methods Standard Test Methods – Zinc – Locating the
for Measuring Adhesion for Measuring Adhesion Thinnest Spot on
by Tape Test by Tape Test Galvanized Steel Articles –
Test Method (Preece Test)

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Table Continued

Reference item Clause where United States Canada Mexico

no. referenced

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18 6.2.4.10.2 ASTM D 2444-99 ASTM D 2444-99 NMX-E-012-SCFI-1999,
(R2005), Standard Test (R2005), Standard Test Plastics Industry – Pipes
Method for Method for and Connections – PVC
Determination of the Determination of the Pipes and Connections
Impact Resistance of Impact Resistance of without Plastification for
Thermoplastic Pipe and Thermoplastic Pipe and Electrical Installations –
Fittings by Means of a Fittings by Means of a Specifications
Tup (Falling Weight) Tup (Falling Weight)
19 6.2.4.11.3 ASTM D 5025-05, ASTM D 5025-05, NMX-J-192-ANCE-1999,
Standard Specification Standard Specification of Electrical Products – Wires
of Laboratory Burner Laboratory Burner Used and Cables – Flame Test
Used for Small-Scale for Small-Scale Burning on Electrical Cables – Test
Burning Tests on Tests on Plastic Methods
Plastic Materials Materials
20 6.2.4.11.3 ASTM D 5207-03, ASTM D 5207-03, NMX-J-192-ANCE-1999,
Standard Practice for Standard Practice for Electrical Products – Wires
Confirmation of 20-mm Confirmation of 20-mm and Cables – Flame Test
(50-W) and 125-mm (50-W) and 125-mm on Electrical Cables – Test
(500-W) Test Flames (500-W) Test Flames for Methods
for Small-Scale Burning Small-Scale Burning
Tests on Plastic Tests on Plastic
Materials Materials

ASME: American Society of Mechanical Engineers

ASTM: American Society for Testing and Materials

NFPA: National Fire Protection Association

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Annex B (informative)

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B.1 Dimensions of EMT – Steel

(See Clause 5.2.3)

(For information only)

Metric Internal Wall Wall Trade size Internal Wall Wall

designators diameter, thickness, US thickness, diameter, thickness, US thickness,
and Canada, Mexico, and Canada, Mexico,
mm mm mm in in in
16 15.80 1.07 1.1 1/2 0.622 0.042 0.042
21 20.93 1.24 1.2 3/4 0.824 0.049 0.049
27 26.64 1.45 1.5 1 1.049 0.057 0.060
35 35.05 1.65 1.5 1-1/4 1.380 0.065 0.060
41 40.89 1.65 1.5 1-1/2 1.610 0.065 0.060
53 52.50 1.65 1.5 2 2.067 0.065 0.060
63 69.37 1.83 1.8 2-1/2 2.731 0.072 0.072
78 85.24 1.83 1.8 3 3.356 0.072 0.072
91 97.38 2.11 2.1 3-1/2 3.834 0.083 0.083
103 110.08 2.11 2.1 4 4.334 0.083 0.083

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Annex C (informative)

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C.1 Coating tests overview

(See Clause 5.3.1.1)

Coatings Tests Clause

Zinc Bend Test 6.2.1.1
Cold Bend 6.2.1.3
Zinc Coating Test 6.2.2
Alternate Corrosion-Resistant Bend Test 6.2.1.1
Cold Bend 6.2.1.3
Ultraviolet Light and Water 6.2.4.5
Salt Spray (Fog) 6.2.4.6
Moist Carbon Dioxide-Sulfur Dioxide-Air 6.2.4.7
Tensile 6.2.4.8
Adhesion 6.2.4.9
Flame Propagation 6.2.4.11
Alternate Corrosion-Resistant Electrical Continuity 5.3.3.2
Nonmetallic; in addition to the above
Assembly, Bending, Resistance, Pull, 5.3.3.2
and Fault Current
Identification of Compounds 6.2.1.4
Cold Impact 6.2.4.10
Organic Bend Test 6.2.1.1
Cold Bend 6.2.1.3
Identification of Compounds 6.2.1.4
Elasticity 6.2.3.1
Warm Humid Air Test 6.2.3.2
Supplementary Coatings Detrimental Effects to Primary 5.3.5.2
Corrosion-Resistant Coating
Fit of Couplings 5.3.5.2
Electrical Continuity 5.3.5.2
Flame Propagation 6.2.4.11
Surface Treatment N/A if less than 0.038 mm (0.00015 in) 5.3.6.1
thickness

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Annex D (informative)

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D.1 Examination of finished product by manufacturer

(See Clauses 5.2.1 and 5.4.1)

Note: This annex is not a mandatory part of this Standard but is written in mandatory language to accommodate
its adoption by anyone wishing to do so.

D.1.1 Each length of EMT shall be examined visually on both the exterior and interior surfaces to
determine the absence or presence of poor coatings, hard scale, burrs or fins, or other defects.

D.1.2 The examination of interior surfaces of electrical metallic tubing shall be made by looking through
the product (first from one end and then from the other) at an artificial light.

D.1.3 The interior of the product shall have a smooth, continuous zinc or organic coating giving a uniform
appearance throughout the entire length. The presence of occasional slight roughness, presumably
because of an uneven flow of the coating, shall be allowed. The entire absence of such rough patches
and a perfectly smooth finish on the interior surface is the best evidence of acceptable cleaning, corrosion
protection, and complete absence of scale, burrs or fins, dirt, defects, and foreign substances from the
finished tubing and elbows.

D.1.4 Elbows shall be examined as described in Clause 5.4.1 as straight lengths before the lengths are
bent. In addition, elbows shall be monitored while being bent for evidence of flaking and other damage.

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Annex E (informative)

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E.1 Alternative National Markings

(See Clause 7)

E1.1 Products intended for use in specific national applications may bear the following alternative
markings to those specified in Clause 7 of the Standard.

Table E1
Alternative National Markings

Clause English Spanish French

7.3 Electrical Metallic Tubing Tubo metálico rígido de acero Tube électrique métallique
tipo ligero
7.4 Consult manufacturer for proper Consultar con el fabricante sobre Consulter les directives d’installation
installation los requisitos de instalación du fabricant
7.7 Corrosion protection properties of Las propiedades de la cubierta Le degré de protection contre la
the ____ coating were not de____ para la protección contra corrosion du revêtement ____ n’a
investigated la corrosión no ha sido sometidas pas été étudié
a pruebas

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No Text on This Page

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