W-C-375E
TABLE IV. Qualification inspection - Continued.
11 X - Indicates test required.
21 Circuit breakers whose automatic operation does not depend on the heating effect of current and is not affected by changes in ambient temperature.
31 Circuit breakers whose automatic operation depends on the heating effect of current and is affected by changes in ambient temperature.
41 If a circuit breaker includes any thermal compensation in its tripping mechanism, and if the manufacturer desires to have the circuit breaker marked "40°C", it shall be subjected to the tests for a compensated thermal breaker.
51 Circuit breakers whose automatic operation depends on the heating effect of current, and which incorporate means for counteracting the effects of change in ambient temperature.
61 Group I tests apply to all circuit breaker designs, secondary sample group II tests apply to circuit breaker designs with high interrupting capacity ratings (see 4.5.1.1), and group III tests apply to fused circuit breakers (see 4.5.1.2).
71 Tests made only on circuit breakers rated at 50 amperes or less, rated 120 or 120-240 volts or less.
81 This test may be performed after the temperature and 100 percent calibration tests at 25°C.
91 "O" operation (see 6.7.2), conducted slightly above crossover to ensure operation of current limiters or fuses.
Cotton and cheesecloth (see UL 489) indicators shall be sued when crossover current is less than short circuit current.
101 With dummy fuses, "O" and "CO" (see 6.5) operation, no cheesecloth or cotton indicators used.
111 No cheesecloth or cotton indicators used in circuit breaker area. Cotton used to cover openings in current limiter area.
4.5.3 Retention of qualification. To retain qualification, the contractor shall utilize the applicable procedure as follows:
a. Those suppliers that used the inspection requirements of 4.5.1, and when applicable, 4.5.1.1, or 4.5.1.2 to obtain qualification shall provide verification to the qualifying activity for the following items every 12 months:
Verification that the conformance inspections have been performed on inspection lots supplied to the requirements of this specification. If test results indicate nonconformance with specification requirements, and corrective action acceptable to the qualifying activity has not been taken, action may be taken to remove the failing product from the QPL.
In the event that no production has occurred in this period, the contractor shall still verify to the qualifying activity that the capacity to manufacture and test QPL circuit breakers still exists and that the contractor wants to remain on the QPL.
10
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business