TEST PROCEDURE 033 ELECTRICAL CABLE/WIRING HARNESSES

SB 740-91-01

TEST PROCEDURE 033

ELECTRICAL CABLE/WIRING HARNESSES

1General.

Only calibrated instruments meeting the requirements of this section shall be used for testing. The accuracy of the test

instrument shall be i5 percent or better. Unless atmospheric conditions of tests are specified in the individual test

procedure, all measurements and tests (see data sheet, figure B-2) are to be made under the following conditions

25 + 5C (770 90F)

Temperature:

Air Pressure:

27 to 31 inches of mercury

Relative Humidity:

30 to 60 percent

2Definitions.

The following definitions are for clarification of this specification:

Continuity is the verification of interconnected end points of an electrical conductor, except when the actual maximum

electrical resistance is specified on the engineering drawing; then it becomes a resistance measurement between the two

end points of the conductor.

Withstand voltage tests are those made to determine the ability of insulating materials and spacing to withstand

overvoltage without flashover or breakdown.

Wire bundle is a number of wires or wire groups routed together and bound by bundle ties.

Wire group is a number of wires tied together and routed to a single item or set of equipment.

Wiring is a term which designates wires, harness and cable, and their associated hardware, in any stage of assembly or

installation.

Insulation resistance is the resistance of an insulated conductor offered by its insulation to an impressed direct voltage.

Shield is a braided metallic conductor applied over the basic wire or cable to isolate the conductor from extraneous

electrical and magnetic fields.

3Precautions.

All personnel involved in the testing of electrical cables, wiring, and harnesses shall be properly instructed to operate the

test equipment and adequately trained to carry out the test procedure. The test in this procedure shall not be made in

explosion hazardous areas which either contain or have contained explosive material, except when the test can be

performed with an explosion-safe type tester.

Most of the equipment used in the testing of electrical wiring involves the use of hazardous voltage and current. Safety

precaution must be taken against electrical shock in operating such electrical test equipment. Whenever an electrical

shock

B-9