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Quality Assurance checks for LT PVC Control Cable

1. PVC Power and Control Cable are to be tested for final test Routine and

Acceptance test at shop prior to dispatch.

2. The final Routine test to be carried out on completed cable in line with IS-1554

shall be as follows:

i. High voltage test

ii Conductor Resistance measurement

3. The final Acceptance test in line with IS-1554 to be carried out on cable

samples taken from end with sampling plan as specified in IS or agreedunder contract shall be as follows:

i Overall dimension, conductor size, number of stands, lay length,

direction of lay, thickness of insulation, core identification, inner sheathand outer sheath thickness.

ii. In case of armoring the no of armor wire/ strip, size and coverage to be

measured. Armor wire sample to be checked for tensile, Elongation,wrapping/ torsion and adhesion test. Samples to be also checked for mass

of zinc coating.

iii. Conductor Resistance measurementiv. Annealing test as per IS-8130 (for reference)

v .Insulation resistance (volume resistivity)

Only one sample of any size from the offered lot of PVC insulation andSheath to tested for:

i. Thermal stability test.ii. Oxygen index on Outer sheath as per ASTM-D-2863

iii. Smoke density on outer sheath as per ASTM D-2843

iv. Acid gas generation test on outer sheath as per IEC-754v. Fire resistance test as per SS 4241475

vi. One length of cable to checked for length measurement and while

measurement of length visual defects if any, sequential marking,

embossing are to be checked.

One sample of any size from the complete order may be selected for :

i. Tensile and elongation of PVC insulation and outer sheath after ageingii. Flamability test as per IEC-332-3 -B

4. The cable drums are to be provided in good conditions with proper identificationsuitable for transportation and storage / handling till lying of cable. In case

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of wooden drums necessary ant termite treatment to be provided. The cables

are to be sealed at both ends prior to dispatch.

5. The manufacturing of Cables are to be carried out as per Quality program ofmanufacturer which shall atleast meet the following incoming and process

checks:

iii. Conductor material, resistivity, dimension, joints and laylength shall

confirm to requirements specified in IS-8130. The annealing process

shall be controlled to meet the required strength and finish.iv. PVC insulation, inner and outer sheath material properties including

FRLS for outer sheath shall meet the requirement of standard

specified/ as per IS-5831 and standards for FRLS specified in this

specification.v. The insulated core shall be checked for finish, color and to be tested for

spark test preferably using on line testers with counter/ identification

system

vi. Armor wire/ strip samples to be checked for size, tensile, elongation,wrapping/torsion and galvanization check as per IS-3975. The

coverage of armor and absence of overlap to be checked duringarmoring process.

vii. The extruders used shall have temperature controllers to give smooth

finish and free from defects.viii. The outer sheathing color, finish, diameter needs to be controlled. The

sequential marking shall be legible and be indented for longer

retention.

ix. Checks on wooden / steel drums as per requirement of standard / as perIS- 10418.

6. The cables are to be manufactured to meet the schedule and deliveries and shallhave facility to test high voltage safely on minimum 10 drum at a time.