FED-STD-228A
Method 2043.1
18 APRIL 2014
FLEXIBILITY, FIBROUS COVERINGS, LOW TEMPERATURE
1. SCOPE
1.1 This method is intended for use in determining the effect of bending at low temperatures on fibrous
coverings of wire and cable.
2. SPECIMEN
2.1 The specimen, from a single insulated conductor 0.500 inch in diameter and smaller, should be a
piece of the inspection unit of sufficient length to permit bending three complete turns around a mandrel
of the diameter specified in table I. The specimen from a single insulated conductor larger than 0.500
inch in diameter and any multiple conductor cable, should be a piece of the inspection unit of sufficient
length to permit bending one complete turn around a mandrel of the diameter specified in table I. Any
covering over the fibrous covering to be tested should be removed.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 Mandrel with a diameter equal to the over-all cable diameter multiplied by the factor specified in
table I.
3.1.2 Cold chamber as a refrigerator or other equipment capable of maintaining the specimen at the
required temperature within ± 1°C (2°F).
TABLE I. Multiplying factor for determining mandrel diameter
Cable diameter
0 to 0.5 inch 0.501 to 1.000 inch
1.001 to 1.500 inches Over 1.500
inches
Conductor size, AWG
Any size
Up to 4/0 4/0 and over Up to 4/0 4/0 and over Any size
(inch)
Insulation thickness:
10/64 and smaller
3
4
6
6
8
12
Over 10/64 to 20/64
4
5
7
7
10
12
Over 20/64
6
8
8
12
12
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, the specimen shall be subjected to a
temperature of -10° ± 1°C. (14° ± 2°F) for a period of 5 ± ¼ hour.
4.2 The specimen shall be free from mechanical damage and shall not be bent or flexed until it has
reached room temperature. It shall then be straightened and placed in the cold chamber for the required
time at the required temperature. At the end of the exposure period, the specimen shall be removed from
the cold chamber and bent immediately around a mandrel of the required size at a uniform rate of not less
than 10 nor more than 12 turns per minute. The specimen shall be clamped in the bent position and
inspected visually for breaking of the yarn in the fibrous covering and flaking of the finishing material from
the cable. Cracking is not necessarily flaking of the finish.
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