Selectividad Eaton NEMA
Selectividad Eaton NEMA
Contents Introduction
Introduction . . . . . . . . . . . . . . . . . . . . . . . Page 2 The purpose of this publication is to explain the proper
UL Issues . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 application of series ratings in Eaton’s panelboards
and switchboards.
Code Issues . . . . . . . . . . . . . . . . . . . . . . . Page 3
Applying Series Ratings . . . . . . . . . . . . . Page 4 Industry standards and NFPA® 70—the National Electrical
Code® (NEC®) require protection of the entire electrical
Example 1 . . . . . . . . . . . . . . . . . . . . . Page 4 distribution system from damage due to short-circuit
Example 2 . . . . . . . . . . . . . . . . . . . . . Page 4 faults. NEC Article 110.10 states “The overcurrent protective
Example 3 . . . . . . . . . . . . . . . . . . . . . Page 4 devices… shall be selected and coordinated to permit the
circuit-protective devices used to clear a fault to do so
Other Applications of Series Ratings . . . Page 4 without extensive damage to the electrical components of
Series Rating Tables . . . . . . . . . . . . . . . . . Page 5 the circuit.” The entire distribution system is required to
Breaker to Breaker Ratings meet this standard. Series rated systems have become an
effective method of meeting these requirements.
Table 1 — 120/240 Volts . . . . . . . . . . Pages 5–8
Table 2 — 240 Volts . . . . . . . . . . . . . . Pages 9–11 There are three protection systems used to protect low voltage
power distribution conductors and equipment. They are:
Table 3 — 277 Volts . . . . . . . . . . . . . . Pages 11 & 12
Table 4 — 277/480 Volts . . . . . . . . . . Page 12 ■ Fully rated protection
Table 5 — 480 Volts . . . . . . . . . . . . . . Pages 13 & 14 ■ Fully rated, selectively coordinated protection
■ Series rated protection
Table 6 — 600 Volts. . . . . . . . . . . . . . Page 15
Fuse to Breaker Ratings Fully Rated Protection: Where all overcurrent devices are
Table 7 — 120/240 Volts . . . . . . . . . . Page 16 rated for the full prospective short-circuit current at their line
side terminals throughout the system.
Table 8 — 240 Volts . . . . . . . . . . . . . . Page 16
Table 9 — 277 Volts . . . . . . . . . . . . . . Page 17 Selectively Coordinated Protection: Is a fully rated system
where the overcurrent device closest to the fault will open
Table 10 — 277/480 Volts . . . . . . . . . Page 17 first, thus isolating the faulty circuit.
Table 11 — 480 Volts . . . . . . . . . . . . . Page 18
Series Rated Protection: A short-circuit interrupting rating
Table 12 — 600 Volts . . . . . . . . . . . . . Page 18 assigned to a combination of two or more overcurrent
Triple Ratings protective devices that are connected in series and which the
Table 13 — Main Fuse . . . . . . . . . . . Page 19 rating of the downstream device(s) in the combination is less
than the series rating.
Table 14 — Main Breaker . . . . . . . . Page 19
The short-circuit interrupting rating of the first device in the
series must be equal to or greater than the available fault
current. Downstream breakers, however, are not fully rated
for the system’s available fault current.
Series ratings are also known in the industry as integrated
ratings, series combination ratings, and series connected
ratings. The upstream overcurrent device in the series may
be either internally or externally feeding downstream
devices.
The latest revision of this document with up-to-date series
ratings may be found at either of the following links:
■ www.eaton.com/panelboards (>Instructions)
■ www.eaton.com/switchboards (>Instructions)
Switchboard
Series Rating
UL Issues
In a series rated system, the overcurrent devices in series CAUTION: Do not apply fuses using the up-over-down
in the protective scheme must have been tested and listed method for sizing a current-limiting fuse that protects a
by Underwriters Laboratories® (UL®), for series combination downstream molded-case circuit breaker with a specified
use in the system. rms symmetrical interrupting rating. The method can lead to
erroneous and unsafe conclusions and should not be used.
All of Eaton’s series ratings are in full compliance with all
applicable requirements of the latest editions of UL 489,
891, and 67.
The UL Recognized Components Directory (the Yellow Book)
contains breaker manufacturers’ series connected listings.
These are intended only as a guideline for use by others who
are responsible for their own testing, labeling, and listing.
Therefore, the UL Recognized Components Directory can not
be used to interpret series-connected ratings in equipment.
Code Issues
Requirements of NFPA 70—the National Electrical Code for
series ratings may be met by equipment marked with ratings
adequate for the available fault current at the point of appli-
cation in the electrical system. Eaton’s panelboards and
switchboards are marked consistent with NEC Article 240.86
for tested combinations.
NEC 240.86 Motor Contribution. Series ratings shall not be
used where:
1. Motors are connected on the load side of the higher-
rated overcurrent device and on the line side of the
lower-rated device. Figure 1.
2. The sum of the full-load currents exceeds 1% of the Conclusion: This conclusion is wrong when the downstream
interrupting rating of the lower-rated breaker. service has a blow-open contact assembly, as does a
molded-case circuit breaker or similar device. It may be
Note: NEC 240.86 is additive and both conditions must be
met to apply. valid when the current-limiting fuse is sized to protect a
passive bus bar system.
Additionally, NEC Article 110.22 requires field marking The up-over-down method ignores dynamic impedance
on equipment where series ratings are used. This label is (the inherent current-limiting of the downstream molded-
supplied with Eaton panelboards and switchboards using case circuit breaker). Such impedance is developed directly
series combination ratings and reads “Caution—Series by the forces of the let-through current created when the
Combination System Rated _____ Amperes Available. contacts are blown open.
Identified Replacement Component Required.”
Some breakers rated 15 to 50 amperes, 120/240 volt
maximum have been investigated and found suitable for
use in panelboards from a different manufacturer. These are
identified as “Classified” breakers. DO NOT USE SERIES
RATINGS WITH “CLASSIFIED” BREAKERS! Series ratings
apply ONLY to those Eaton breakers listed and published in
this booklet.
Step 2. Select the appropriate table using the system voltage. 1. Go to the 480Y/277 volts table (Table 4).
Step 3. Use the appropriate “Series Equipment Rating” 2. Look under the 25 kA column. This rating is not shown.
column equal to, or greater than, the available fault Look to the columns to the right. This rating is shown
current, to determine the allowable UL recognized under the 35 kA column, and therefore is valid for
combinations of main (upstream) and branch (down- combinations with the 2- and 3-pole GHB breakers.
stream) overcurrent devices. Main devices are shown
3. Go to the 277 volts table (Table 3).
in bold/shaded areas. Respective branch breakers are
shown directly below their associated main device. 4. Look under the 25 kA column. This rating is not shown.
If a rating is not initially found in a column, first Look to the columns to the right. This rating is shown
look to the columns to the right for higher “Series under the 35 kA column, and therefore is valid
Equipment Ratings” within the same table. If still for combinations with the single-pole GHQ breaker.
not found, use ratings from table of a higher system
voltage (higher numbered table).
Other Applications of Series Ratings
Example 1: Series ratings can also be applied under the following
208Y/120 volt, 3-phase, 4-wire, AC system with available guidelines:
fault current of 26,438 amperes. Main (upstream) device
is a 3-pole, 225 ampere, EDS breaker. The branch (down- ■ Any FULLY RATED breaker can be applied upstream,
stream) breakers are single- and 2-pole, 20, 30, and downstream, or in the middle of any of the series ratings
60 amperes, 120 volt and 120/240 volt BAB breakers. stated in the tables
■ Any series rating stated in the tables may have additional
1. Go to the 120/240 volts table (Table 1). series rated branch breakers of the EXACT SAME TYPE
2. Look down under the 22 kA column. This rating is further downstream in that rating
not shown. COMBINING SERIES RATINGS are allowed under certain
3. Look to the columns to the right. This combination conditions. Main and branch ratings may be combined if:
rating is shown under the 42 kA column, and therefore ■ Breakers A, B, and C are in series respectively from
is valid. main to branch. Breakers A and B series rate together.
Breakers A and C series rate at the same interrupting level
Example 2: (or higher). It is allowable to use A, B, and C together at
480Y/277 volt, 3-phase, 4-wire, AC system with available the A-B series rating
fault current of 62,097 amperes. Main (upstream) device is a
It is improper to combine series ratings under the following
3-pole 250 ampere, HJD breaker. The branch (downstream)
condition:
breakers are 2- and 3-pole, 60, 70, and 100 ampere
EHD breakers. ■ Breakers A, B, and C are in series respectively from main
to branch. Breakers A and B series rate together. Breakers
1. Go to the 480Y/277 volts table (Table 4).
B and C series rate at the Breaker B interrupting rating
2. Look down under the 65 kA column. This rating is level. It is not allowable to use A, B, and C together at
not shown. the A-B series rating. However, combining multiple over-
current devices as in this example, can be accomplished
3. Look to the columns to the right. This rating is not if all devices in the series combination have been tested
shown. together and listed in triple rating Table 13
4. Look at the table with the next higher system voltage. Note: The information contained in this manual also applies to
(480 volts, Table 5). specifying the upstream overcurrent protective device for use with
through-feed and sub-feed panelboards without an integral main.
5. This combination rating is shown under the 65 kA
column, and therefore is valid.
Switchboard
Series Rating
225 EDB, EDS, ED, FD, FDE HFDE, EDH, EDC, HFD, FDC, FDC,
PDD2xF 1 PDD2xG 1 PDD2xG, 1 PDG2xM 1 PDD2xM, 1 PDG2xM 1 PDG2xP 1 FDCE,
PDG2xG 1 PDD2xP 1 PDG2xP 1
BAB 2 BAB BAB 2 QBGF BAB 2 BAB 2 BAB BAB 2 GB, GHB
BABRP BABRP BABRP QPGF HQP 2 BABRP HQP HQP 2 GHQ
BABRSP BABRSP BABRSP QBAF QBHW 2 BABRSP QBGF QBHW 2 (15–20 A) 6
HQP 2 HQP 2 HQP QBAG QPHW 2 HQP 2 QBAF QPHW 2 GHQRSP
QBGF QBGF (2-pole only) QBHGF QBGF QBAG EHD
QPGF QPGF QBGF QBGFT QPGF QBHW FD, FDE
QBHGF QBHGF QPGF QPGFT QBAF QPHW (15–150 A)
QPHGF QPHGF QBAF QBHGFT QBAG QBHGF HFD, HFDE
QBHW QBHW QBAG QBCAF QBGFT GB, GHB (15–150 A)
QPHW QPHW QBHW QPHGF QBCAF GHQ EGS
QBAF QBAF QBHGF QPHGFT QB–AFGF (15–20 A) 6 EGH
QBAG QBAG QBGFT (15–20 A) 5 GHQRSP HGHB
QBGFT QBGFT QPGFT QB–CAF EHD PDG2yF
QPGFT QPGFT QBHGFT (15–20 A) 5 FD, EGS (15–100 A) 3
QBHGFT QBHGFT QBCAF QB–EP QBGFT PDG2yG
QPHGFT QPHGFT QPHW (15–20 A) 5 QBHGFT (15–150 A) 3
QB–AFGF QBCAF QPHGF QB–GF QBCAF
(15–20 A) 5 QB–AFGF (15–20 A) 5 QPHGF
QB–CAF (15–20 A) 5 QBH–AFGF PDG2yF
(15–20 A) 5 QB–CAF (15–20 A) 5 (15–100 A) 3
QB–EP (15–20 A) 5 QBH–CAF PDG2yG
(15–20 A) 5 QB–EP (15–20 A) 5 (15–150 A) 3
QB–GF (15–20 A) 5 QBH–EP
(15–20 A) 5 QB–GF (15–20 A) 5
QBH–AFGF (15–20 A) 5 QBH–GF
(15–20 A) 5 QBH–AFGF (15–20 A) 5
QBH–CAF (15–20 A) 5 ED, CVH HFDE,
(15–20 A) 5 QBH–CAF PDD2xG 1 PDG2xM 1
QBH–EP (15–20 A) 5
(15–20 A) 5 QBH–EP QB–AFGF BAB 2 BAB
QBH–GF (15–20 A) 5 (15–20 A) 5 HQP 2 HQP
(15–20 A) 5 QBH–GF QB–CAF QBGF QBGF
(15–20 A) 5 (15–20 A) 5 QPGF QBAF
QB–EP QBAF QBAG
(15–20 A) 5 QBAG QBHW
QB–GF QBCAF QPHW
(15–20 A) 5 QBHGF
QBH–AFGF GHB, EHD
(15–20 A) 5 FD (15–150 A)
QBH–CAF QBGFT
(15–20 A) 5 QBHGFT
QBH–EP EGS
(15–20 A) 5 FDE (15–150 A)
QBH–GF QPGF
(15–20 A) 5 QPHGF
QBCAF
QPGFT
QPHGFT
PDG2yF
(15–100 A) 3
PDG2yG
(15–150 A) 3
1 Where x = 2 or 3.
2 Single-pole version is restricted to 15–70 A.
3 Where y = 1 or 2.
4 Not valid with CHKD or PDF3xM.
5 Type ETN02 only.
6 1 pole only.
Switchboard
Series Rating
Switchboard
Series Rating
Switchboard
Series Rating
100 FCL
GHB
GHQ (15–20 A) 6, GHQRSP
EHD
FD (15–100 A)
HFD (15–100 A)
PDG2yF (15–100 A) 1
PDG2yG (15–100 A) 1
PDG2yM (15–100 A) 1
125 EGS EGH
GHB GHB
GHQ (15–20 A) 6 GHQ (15–20 A) 6
225 FD, FDE, HFD, HFDE, FDC, FDCE,
PDG2xG 2 PDG2xM 2 PDG2xP 2
GHB GHB GHB
GHQ (15–20 A) 6 GHQ (15–20 A) 6 EHD
GHQRSP GHQRSP FD (15–150 A)
GHBGFEP 3 GHBGFEP HFD (15–150 A)
EHD PDG2yF (15–100 A) 1
FD (15–150 A) PDG2yG (15–150 A) 1
PDG2yF (15–100 A) 1 PDG2yM (15–150 A) 1
PDG2yG (15–150 A) 1
1 Where y = 1 or 2.
2 Where x = 2 or 3.
3 Not valid with FDE.
4 Not valid with JDB.
5 Valid on 2- and 3-pole breakers only. Not valid for single-pole.
6 1 pole only.
Switchboard
Series Rating
Switchboard
Series Rating
100 R
BAB
HQP
QBHW
QPHW
GB
GHB
200 J T R J T
QB–AFGF (15–20 A) 1 QB–AFGF (15–20 A) 1 GB BAB BAB
QB–CAF (15–20 A) 1 QB–CAF (15–20 A) 1 GHB HQP HQP
QB–EP (15–20 A) 1 QB–EP (15–20 A) 1 QBHW QBHW
QB–GF (15–20 A) 1 QB–GF (15–20 A) 1 QPHW QPHW
QBH–AFGF (15–20 A) 1 QBH–AFGF (15–20 A) 1
QBH–CAF (15–20 A) 1 QBH–CAF (15–20 A) 1
QBH–EP (15–20 A) 1 QBH–EP (15–20 A) 1
QBH–GF (15–20 A) 1 QBH–GF (15–20 A) 1
400 J T J T
BAB BAB GB GB
HQP HQP GHB GHB
QBHW QBHW
QPHW QPHW
1 Type ETN02 only.
100 R
BAB-H
HQP-H
QBHW-H
QPHW-H
GHB
200 J T R
BAB-H BAB-H GHB 1
HQP-H HQP-H
QBHW-H QBHW-H
QPHW-H QPHW-H
400 J T
GHB GHB
6000 L
EHD
FDB
FD, FDE (15–150 A)
JD, JDB
DK, KD, KDB
PDG2xF (15–100 A) 2
PDG2xG (15–150 A) 2
PDG3xG 2
PDD3xG 2
1 Valid on 2- and 3-pole breakers only. Not valid for single-pole.
2 Where x = 2 or 3.
Switchboard
Series Rating
100 J T R
GHBS GHBS GHB
GHQ (15–20 A) 2 GHQ (15–20 A) 2 GHQ (15–20 A) 2
GHQRSP GHQRSP
200 J T J T R
GHBS GHBS EHD EHD GHB
GHQ (15–20 A) 2 GHQ (15–20 A) 2 FD, FDE FD, FDE
GHQRSP GHQRSP (15–150 A) (15–150 A)
HFD, HFDE HFD, HFDE
(15–150 A) (15–150 A)
FDC, FDCE FDC, FDCE
(15–150 A) (15–150 A)
PDG2xF PDG2xF
(15–100 A) 1 (15–100 A) 1
PDG2xG PDG2xG
(15–150 A) 1 (15–150 A) 1
PDG2xM PDG2xM
(15–150 A) 1 (15–150 A) 1
PDG2xP PDG2xP
(15–150 A) 1 (15–150 A) 1
400 J T
GHB GHB
1 Where x = 2 or 3.
2 1 pole only.
100 J T R
GHBS GHBS GHB
200 J T R
GHBS GHBS GHB
400 J T
GHB GHB
600 J T
EHD GHB
FD, FDE EHD
(15–150 A) FD, FDE
HFD, HFDE (15–150 A)
(15–150 A) HFD, HFDE
FDC, FDCE (15–150 A)
(15–150 A) FDC, FDCE
PDG2xF (15–150 A)
(15–100 A) 1 JD
PDG2xG HJD
(15–150 A) 1 JDC
PDG2xM PDG2xF
(15–150 A) 1 (15–100 A) 1
PDG2xP PDG2xG
(15–150 A) 1 (15–150 A) 1
PDG2xM
(15–150 A) 1
PDG2xP
(15–150 A) 1
1 Where x = 2 or 3.
100 R
EHD
PDG2xF (15–100 A) 1
200 J T
EHD EHD
PDG2xF (15–100 A) 1 PDG2xF (15–100 A) 1
1 Where x = 2 or 3.
100 R
FD, FDE (15–150 A)
HFD, HFDE (15–150 A)
FDC (15–150 A)
PDG2xG (15–150 A) 1
PDG2xM (15–150 A) 1
PDG2xP (15–150 A) 1
200 J T R
FD, FDE (15–150 A) FD, FDE (15–150 A) JD
HFD, HFDE (15–150 A) HFD, HFDE (15–150 A) HJD
FDC (15–150 A) FDC (15–150 A) JDC
PDG2xG (15–150 A) 1 PDG2xG (15–150 A) 1
PDG2xM (15–150 A) 1 PDG2xM (15–150 A) 1
PDG2xP (15–150 A) 1 PDG2xP (15–150 A) 1
400 J T R
JD JD KD
HJD HJD HKD
JDC JDC KDC
PDG3xG 1
PDG3xM 1
PDG3xP 1
600 J T
KD KD
HKD HKD
KDC KDC
PDG3xG 1 PDG3xG 1
PDG3xM 1 PDG3xM 1
PDG3xP 1 PDG3xP 1
1 Where x = 2 or 3.
Switchboard
Series Rating
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Publication No. 1C96944H02 / Z23801
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