FED-STD-228A
Method 6131.1
18 APRIL 2014
VOLTAGE WITHSTAND, INSULATION, FLEXING, LOW TEMPERATURE
1. SCOPE
1.1 This method is intended for use in determining the ability of insulated wire and cable to withstand a
limited amount of flexing at low temperature without breakdown of the insulation. It is particularly
applicable to varnished cloth and rubber insulated wire and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 13 feet in length.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 A mandrel having the diameter indicated in table I.
TABLE I.
Thickness of con-
Mandrel diameter as multiple
of over-all cable diameter
ductor insulation
(64ths inch)
Up to 500,000
500,000
circular mil
circular mil
conductor
conductor
and over
10 to 12 - - - - - -
8
10
13 to 20 - - - - - -
10
12
20 and over - - -
12
12
3.1.2 A cold chamber as a refrigerator or other equipment capable of maintaining the specimens at the
required temperature within ± 2°C (4°F).
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, the specimen shall be subjected to a
temperature of -12° ± 2°C (14 ± 4°F) for a period of not less than 5 hours.
4.2 Unless otherwise specified in the detail specification, the test voltage shall be applied for a period of
2 hours from the time the specified voltage is reached.
4.3 The test voltage shall be as specified in the detail specification.
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