W-C-375E
4.2 Classification of inspections. The inspections specified herein are classified as follows:
a. Qualification inspection (see 4.5). b. Conformance inspection (see 4.6).
4.3 Inspection of materials and components. In accordance with 4.1, the supplier is responsible for insuring that materials and components used were manufactured and inspected in accordance with the requirements of this specification and of referenced subsidiary specifications and standards to the extent specified, or if none, in accordance with this specification (see 3.3).
4.4 Inspection conditions. All inspections, examinations, and tests shall be performed in accordance with this specification and the applicable portion of UL 489.
4.5 Qualification inspection. Qualification shall be obtained by either of the following:
a. By testing the circuit breakers in accordance with 4.5.1. Qualification inspection shall be performed at a laboratory acceptable to the Government (see 6.3), on sample units produced with equipment and procedures normally used in production.
b. By having UL marking on circuit breakers. Manufacturers electing this option shall submit a letter of certification to the qualifying activity listing the UL file number, the Government part number, and the manufacturer's part number for each circuit breaker rating for which qualification is desired. The manufacturer shall also certify that he will notify the qualifying activity of any problem which threatens loss of the UL mark within 30 days after recognition of the problem.
NOTE: Extension of qualification. For circuit breaker ratings marked "Not for new design" (see 3.1), qualification is waived, however, acquisition shall be made from a source qualified for the remainder of values on that specification sheet.
4.5.1 Inspection routine. Circuit breakers shall be subjected to the tests specified in table IV in the order shown, for that circuit breaker design. Sample size shall be as specified in UL 489 for both the minimum and maximum current rating of each specification sheet. In the event of an internal design change, the minimum and maximum rating of each design shall be tested.
4.5.1.1 High available fault current ratings. Circuit breaker types which have been qualified for use in limited available fault current circuits via successfully passing group I testing may also be qualified for use on high available fault current circuits by passing the test specified in group II. Group II tests will be run on a new set of samples of the same type that has passed group I and shall be marked with one or more of the interrupting ratings specified in
table XV to signify its capabilities. Sample size shall be as specified in UL 489.
4.5.1.2 Fused circuit breakers. Group III tests apply only to fused circuit breakers and may, at the option of the manufacturer, be performed on a new set or sets of samples as specified in UL 489.
4.5.2 Failures. One or more failures shall be cause for refusal to grant qualification approval.
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