W-C-375-SUP-2 Circuit Breakers, Molded Case; Branch Circuit and ServiceThis specification covers the general requirements and test procedures for molded case circuit breakers which fall within the general parameters specified in table XVI which are specifically designed to provide service-entrance, feeder, meter-service, or branch circuit protection and rated at not more than 4,000 amperes and 600 volts ac, 60 hertz Hz see 3.1 and 6.1.

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W-C-375E

b.    Those suppliers that used the Underwriters Laboratories Listed (UL Listed) mark to obtain qualification shall submit certification that the qualified circuit breakers retain the UL Listed mark, at 12-month intervals, to the qualifying activity.  The letter of certification shall include the UL file number, the Government PIN, and the manufacturer's PIN for each circuit breaker which is qualified.  The manufacturer shall also certify that they will notify the qualifying activity of any problem which threatens loss of the UL Listed mark within 30 days after recognition of the problem.  The initial reporting date shall be established by the qualifying activity. Failure to submit the certification within 30 days after the end of each 12-month period may result in loss of qualification for the product.

Failure to submit the above within 30 days after the end of each 12-month period may result in loss of qualification for the product.  Suppliers shall notify the qualifying activity immediately of inspection data that indicates failure of the product to meet the requirements of UL 489.

4.6  Quality conformance inspection.  Quality conformance inspection shall consist of groups A, B, and C inspections as specified herein, for circuit breakers which qualified in accordance with 4.5(a).  For circuit breakers which qualified in accordance with 4.5(b), the UL Listed Mark shall be evidence of compliance.

4.6.1  Inspection of product for delivery.  Inspection of product for delivery shall consist of groups A and B

inspections.

4.6.1.1  Inspection lot.  An inspection lot shall consist of all circuit breakers of the same specification sheet and current rating produced under essentially the same conditions, and offered for inspection at one time.

4.6.1.2  Group A inspection.  Group A inspection shall consist of the tests specified in table V and is applicable to all circuit breaker designs.

TABLE V.  Group A inspection.

4.6.1.2.1  Sampling plan.  A sample of parts shall be randomly selected from each inspection lot in accordance with table VI.  If one or more defects are found, the lot shall be rescreened and defects removed.  After screening and removal of defects, a new sample of parts shall be randomly selected in accordance with table VI.  If one or more defects are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.

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