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IS 10810-4 (1984): Methods of test for cables, Part 4:

Persulphate test of conductor [ETD 9: Power Cables]

! $ ' +-
Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

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BharthariNtiatakam

Knowledge is such a treasure which cannot be stolen

UDC

621.31555 : 6693 - 426

: 6201

[ 669686 ]

IS : 10810 ( Part 4) - 1984

( Reaffirmed 2001 )

Indian Standard
1

Is1

METHODS

.I

PART

OF TEST FOR CABLES

PERSULPHATE

1. Scope -Covers
two methods for determination
for conductors
used in electrical
cables.
2. Significance -Copper

wires

are tinned

TEST OF CONDUCTOR

of exposed

for the following

copper

in case of tinned

copper wire

reasons:

a) To act as a barrier between bare copper conductor

and elastomeric
insulations
degradation
of the latter due~to catalytic effect of copper on elastomers.
b) TO avoid
material.

formation

of oxide on the copper

During tinning there is possibility

of formation
the purpose of application
of tin.
The persulphate
the conductors.

conductor

which

reduces

to avoid

the solderability

of pinholes on the conductor,

test ascertains
the continuity

of the

thereby defeating
of tin coating on

3. Terminology
3.1

a) Mefhod A -The
continuity
of tin coating is examined by comparing
tion in which the sample
has been immersed with an equal volume
colour reagent for depth of colours.

the persulphate
SOIUof reference standard

b) Method 6 -The
mass of copper
dissolved
is expressed
metre of wire immersed in the persulphate
solution.

of copper

as grams

per square

4. Apparatus
4.1 Porcelain

or Gfass Beaker -

4.2 Nesslers

Tube -

4.3 Pipeffe

Capacity

Graduated -

4.4 Balance 4.5 Volumetric

Capacity

Accuracy

250 ml.

100 ml.

Capacity

100 ml.

01 mg.

Flask-Capacity

1 000 ml.

5. Material
grade crystalline
ammonium persujphate
5.1 Persulphafe Solufion - Dissolve IO g of fresh analytical
[ ( NH4 )&S208] in distilled
water, add 20 ml of ammonia solution (specific
gravity 088 at 27C ) and
make up to one litre with distilled water..
The
subjected

ammonium
persulphate
solution
to temperature above 35C.

5.2 Sfandard

should

be freshly

prepared

each day and should. not be

Co/our Reagent

a) For Method A-Dissolve

add 50 ml of chemically
to one litre.

0.200 g of pure copper sulphate ( CuSO4 5HzO ) in distilled

water,
pvre solution of ammonia (specific
gravity 088 at 27C ) and dilute

b) For Method B - Dissolve

3.927 g of pure copper sulphate
(CuSO4 5HsO) in distilled
water
with 50 ml of ammonia solution ( specific gravity O-88 at 27C ) and make up to one litre with
distilled
water. One millilitre
of this solution is equivalent
to 0001 g of copper.
6. Test Specimen
6.1 A test sample of

length

( L)

equal to y

+ 80 mm (where

d is the nominal

wire

diameter

in

mm ) in case of Method A and a test sample of the length given in col 4 of Table 1 in case ot
Method B is cut from the insulated
core or from each core of finished cable and the insulation
is
removed by any method which does not cause any injury to the tin coating, for example, the insu.
lation may be loosened from the conductor by drawing a solvent and/or oil in the interstitial
space5
of the conductor.

Adopted

14 March 1984

@June

Gr 2

1985, ISI
I

INDIAN
MANAK

STANDARDS
BHAVAN,

INSTITUTION

9 BAHADUR
SHAH
NEW DELHI 110002

ZAFAR

MARG

IS:10810(Part4)-1984
6.2 Two groups of specimens
of continuous
length (L) as mentioned in 6.1 in case of Method A
and two groups of specimens
of continuous
length, each group comprising
the number of single
wires given in col 5 of Table 1 in case of Method B, are taken from the test samples and marked
40 mm from each end by means of a grease penctl or in some other manner which does not cause
damage to the tin coating.
The groups are composed of wires selected at random from the various
cores of the cables.
6.3 Each group of test specimens is wound into one helix upon a smooth mandrel, in such a manner
as to ensure that no twisting moment is imparted to the wires. Those portions of the test specimens
which are necessary to lead up to the 40 mm ends and provide for their projections
above the surface
of the testing solution
in which the specimens
are to be immersed are not formed to the mandrel
but suitably
bent for the purpose in such a way that the radius of the bends is not less than half
the diameter of the mandrel used to produce the helix.
The diameter of the mandrel is given below.

Diameter
I
Over

of Wire
h-----__---7
Up to and Including

mm

of Mandrel

mm

mm

020

15

0 20

030

18

0 30

050

22

050

070

29

0.70

090

33

090

I*10

38

110

1.40

51

1.40

180

56

180

2.00

64

200

230

70

2.30

76

6.4 The helix

the wire.

Diameter

is removed

from

the mandrel

by slipping

it off end-wise

without

further

distortion

of

6.5 A cleaning
operation
is carried out after the helix has been removed from the mandrel and
immediately
prior to its immersion in the test solution and the part to be immersed is not handled.
The method of cleaning
is by the immersion
of the test helix for a period of 10 s in a
suitable solvent, for example, chloroform
or methylated ether, contained in one vessel, followed by
a similar
period of immersion
in solvent contained
in a second vessel, the helix being agitated
during each immersion
and allowed to dry before
immersion
in the test solution.
Should
the
colouration
of the solvent due to dissolved
material become discernible,
the solvent is renewed,
care being taken to ensure that the vessel containing
the cleaner liquid is used for the second (and
final ) wash.
6.6 An alternative
method is to clean the wire before or after the test helix is wound, by rubbing
with a pad~of clean cotton wool soaked in the solvent.
If the insulating
material
is very hard to
remove, it may be removed by preliminary
treatment with hot solvent.
In no case, however, should
the test helix be straightened
and rewound, or subjected to any other serious mechanical
deformation
for the purpose of cleaning, and in all cases the double immersion
described above constitutes
the
final cleaning operation.
2

IS:10810 (Part 4)-1984

TABLE

TEST

SPECIMENS

FOR TINNING

( Clauses
Diameter
and Number of Wires
Comprising
the Conductor
--*
Diameter
Number

--

--Over

TEST

(FOR~METHOD

6)

6.1, 6.2 and 8.1 )

Length
of Test
Specimens

Length of Test Specimen

Between
Marks
------l
Total for
?or
Each
Specimens
Each Group

Number
of Test
Specimens

Up to and
Including
(7)
mm

(1)
mm

(2)
mm
020

10 or more

580

10

500

5 000

020

030

6 or more

1 080

1 000

5 000

030

075

3 or more

750

670

2010

075

320

3 or more

410

-3

330

990

075

3.20

1 080

1 000

1 000

7. Conditioning

(4)
mm

(3)

(6)
mm

(51

-The
test is carried out under normal room temperature
but immediately
of the helix the test solution
is ~brought to a temperature
of 27 f 2C.

the immersion

before,

8. Procedure
8.1

the helix is immersed for 10 min in a vessel containing

a) For Method A - After cleaning,
100 ml of the persulphate
solution
described in 5.1 in such a manner that the surface of
the -wire between the marks is exposed to the testing
solution
and the 40 mm ends
project
above the surface.
The helix is then removed, and the test solution
compared
with an equal volume of the reference standard colour reagent for depth of colours, both
being taken in similar Nesslers tube,
The colour comparison
should be made by viewing
the solutions
lengthwise
through the Nesslers tubes.
b) For Mefhod B - After cleaning,
persulphate solution described
the marks ( see ~01-6 of Table
project above the surface.
The volume

of the solution

For wiresup
For wires

the helix is immersed for 10 min in a vessel containing

the
in 5.1 in such a manner that the surface of the wire between
1 ) is exposed to ttre testing solution
and the 40 mm ends

is as follows:

to and including
above

1.80 mm dia

75 ml
200 ml

1.80 mm dia

The mass of copper

dissolved
from the wire by the persulphate
calorimetrically
by comparison
with the standard colour reagent described
9. Tabulation
9.1 For Method

is determined

of Observations
A

Groups of Specimen

9.2 For Method

solution
in 5.2(b).

Co/our of the Test Solution After Immersion

Darker/Lighter
than the Reference
Standard Co/our Reagent

Groups of Specimen

Standard Co/our Reagent Required

Match the Co/our, ml

1.

2.

to

is

IS:

10810 (Part

4)-

1984

10. Calculation
10.1 a) For Mefhod

A-Nil

b) For Method

B-

Surface

area of immersed

length,

mB = xDf

where
D = diameter
L = length
Mass of copper

of wire in m, and

of wire

dissolved

in m.
= -$&

g/m*

where

copper

W -

dissolved

in g.

11. Report
11.1 Persulphate

Test of Conductor

Cable Type
Batch No./Lot
Cable

No.

No./Drum

No.

Date of Testing
11.2 Results
Reference

Specification

II .2.1 For Method

Specimen

11.2.2 For Method

Specimen

11.3 Conclusion

A
No.

Coloor to Reference Standard Co/our Reagent

h---,-r-----7
Observed
Specified

B
No.

The sample

Mass of Copper Dissolved, g/m2

h-L------~
r-Observed
Specified

Diameter
of Wire
mm

meets/does

not meet the requirements

of the specification.

4
Printed at New lndla Printing Press, Khurja, India