Wiring Without Connectors.

SB 740-91-01

injury occurs, call for a physician and ambulance immediately and employ artificial respiration if necessary.

Testing of circuits with squibs and other detonators installed is hazardous Do not test circuits with squibs and other

detonators to this procedure.

4Wiring Without Connectors.

a. Continuity.

(1) Determine continuity of wiring by measuring the dc resistance of each conductor, including shielding where

accessible The test current must not reach damaging level current.

(2) Test for the absence of shorts between each wire in a bundle and all other wires and shields in the bundle.

(3) Do not measure resistance of thermocouple and other calibrated resistance wiring.

(4) Allowance may be made to compensate for the electrical characteristics of test instrumentation and wiring.

(5) Reject wiring which exceeds the resistance values given in the following table.

Maximum Resistance

Add (for wire length

(for wire length

over 100 ft, 60-

Wire Size

0-100 ft)

ohms1000F), ohm/ft

#26 through #24

0.10

#22 and larger

0.02

Shielding

0.10

b. Withstand Voltage.

(1) Conduct withstand voltage test on all wiring by applying 1500 volts rms, 60 Hz for 5 seconds, minimum, between

each wire and all other wires and shields in the wire bundle electrically connected together as a group.

(2) Conduct withstand voltage test on all ungrounded shields by applying 1000 volts rms, 60 Hz for 5 seconds,

minimum, between each ungrounded shield and all other shields electrically connected together as a group.

(3) Sequence:

(a) Preferred--conduct withstand voltage and insulation resistance tests simultaneously using equipment having

in-phase current measurement capability.

(b) Alternate--when equipment having in-phase current measurement capability is not available, conduct

withstand voltage test before conducting insulation resistance test.

engineering drawing.

B-10