SPECIFICATION 55PC, ISSUE 8

Page 15 of 18

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4.6.13

Shrinkage

A 12-inch (305-mm) specimen of the finished wire shall be cut so that the insulation and

conductor are flush at both ends. The specimen shall be placed in an air-circulating oven and

maintained for a period of 1 hour at the temperature specified in the applicable SCD. The

velocity of air past the specimen location in the oven shall be between 100 and 200 feet

(30 and 61 m) per minute as determined at room temperature. At the end of the 1-hour period,

the specimen shall be removed from the oven and allowed to return to room temperature.

Shrinkage of the insulation shall be measured as the greatest distance which any layer of the

insulation has receded from either end of the conductor; that is, the measurement obtained at

the end showing the greater shrinkage shall be considered the shrinkage of the specimen.

4.6.14

Voltage Withstand (Post Environmental)

The uninsulated ends of the specimen shall be attached to an electric lead. The specimen shall

be immersed in a 5-percent, by weight, solution of sodium chloride in water at 20 to 25°C,

except that the uninsulated ends and 1.5 inches (38 mm) of insulated wire or cable at each end

of the specimen shall protrude above the surface of the solution. Immediately following

specimen immersion, the voltage specified in the applicable SCD shall be applied at 60 Hz

between all the conductors and shields, tied together, as applicable, and the water bath which

shall be grounded. The voltage shall be gradually increased at a uniform rate from zero to the

specified voltage in 0.5 minute, maintained at that voltage for a period of 5 minutes for

finished wire specimens and 1 minute for finished cable specimens, and gradually reduced to

zero in 0.5 minute.

4.6.15

Weight

The weight of each lot of finished wire or cable shall be determined by Procedure I (4.6.15.1).

Lots failing to meet the weight requirement of the applicable SCD when tested in accordance

with Procedure I shall be subjected to Procedure II (4.6.15.2). All spools or reels failing to

meet the requirements of the applicable SCD when tested to Procedure II shall be rejected.

4.6.15.1

Procedure I

A length of wire or cable, sufficient to produce a measured weight to at least 3 significant

figures, shall be weighed and converted to the weight per unit length shown on the applicable

SCD.

4.6.15.2

Procedure II

The net weight of the finished wire or cable on each spool or reel shall be obtained by

subtracting the tare weight of the spool or reel from the gross weight of the spool or reel

containing the finished wire or cable. The net weight of wire or cable on each spool or reel

shall be divided by the accurately determined length of finished wire or cable on that spool or

reel and the resultant figure converted to the weight per unit length shown on the applicable

SCD. When wood or other moisture absorbent materials are used for spool or reel

construction, weight determinations shall be made under substantially uniform conditions of

relative humidity.