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

TABLE VI. Groups A and B, zero defect sampling plan.

Lot size

Sample size

Group A

Group B

Major

Minor

1 to 3

4 to 13

14 to 25

26 to 50

51 to 90

91 to 150

151 to 280

281 to 500

501 to 1,200

1,201 to 3,200

3,201 to 10,000

100 percent

4.6.1.3 Group B inspection. Group B inspection shall consist of the tests specified in table VII, in the order shown and shall be made on sample units which have been subjected to and have passed the group A inspection. The applicability of a test listed for a particular design of circuit breaker shall be as specified in table IV.

4.6.1.3.1 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.

4.6.1.3.2 Disposition of sample units. Sample units which have been subjected to group B inspection and meet the requirements specified herein, may be delivered on the contract or order.

TABLE VII. Group B inspection.

Examination or test

Requirement paragraph

Method paragraph

Calibration

125% at 25°C - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - -

135% at 25°C - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - -

200% at 40°C - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - -

125% at 40°C (after carrying rated current) - -- - - - - - - - - - Calibration of adjustable magnetic trip

(when applicable) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Overload - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Tungsten lamp load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

100% calibration at 40°C - - - - - - - - - - - - - - - - - - - - - - -- - - - Temperature and 100% calibration at 25°C - - - - - - - - - - - - -

3.5

3.5.1

3.6

3.7

3.8

3.9

4.7.2

4.7.2.1

4.7.3

4.7.4

4.7.5

4.7.6

4.6.2 Qualification verification inspection. Qualification verification inspection shall consist of the tests specified in table VIII. Except where the results of this inspection show noncompliance with the applicable requirement (see

4.6.2.1.4), delivery of products which have passed groups A and B shall not be delayed pending the results of this qualification verification inspection.