W-F-18140
this specification and of referenced subsidiary specifications and standards to the extent specified, or if none, in accordance with this specification (see 3.4).
4.4 Inspection conditions. All inspections, examinations, and tests shall be performed in accordance with the applicable conditions specified in UL 248-1, and UL 248-5, UL 248-8, UL 248-10 for classes G, J, and L fuses; UL
248-9 for classes K1, K5, and K9 fuses; and, and UL 248-12 for classes RK1 and RK5 fuses.
4.5 Qualification inspection. Qualification shall be obtained by either of the following:
a. By testing the fuses 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 Listed marking on fuses. 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 fuse rating for which qualification is desired. The manufacturer shall also certify that he will notify the qualifying activity of any problem which threatens the loss of the UL Listed mark within 30 days after recognition of the problem.
4.5.1 Inspection routine (applicable to 4.5a. only). Fuses shall be subjected to the inspections specified in table I, in the order shown. Sample size, character of failures, and number of failures permitted shall be as specified in UL
248-1, and UL 248-5, UL 248-8, and UL 248-10 for classes G, J, and L fuses; as specified in UL 248-9 for classes
K1, K5, and K9 fuses; and as specified in UL 248-12 for RK1 and RK5 fuses.
TABLE I. Qualification inspection.
Inspection |
Applicability (class) |
Requirement paragraph |
Method paragraph |
Visual and mechanical examination- - - - - - - - - - - - - - - Terminal strength - - - - - - - - - - - - Current carrying capacity - - - - - - - Watts loss - - - - - - - - - - - - - - - - - - Overload interrupt 135 percent - - - - - - - - - - - - - - - 150 percent - - - - - - - - - - - - - - - 200 percent - - - - - - - - - - - - - - - 500 percent - - - - - - - - - - - - - - - Opening at rated voltage - - - - - - - Interrupting capacity rating Interrupting ability - - - - - - - - - - Maximum energy - - - - - - - - - - - Intermediate interrupting ability - - - - - - - - - - - - - - - - - - Low interrupting ability - - - - - - - Threshold ratio - - - - - - - - - - - - - - Peak let-thru current - - - - - - - - Maximum clearing I2 - - - - - - - - - T |
G, J, K1, K5, K9, RK1, RK5, L G, J, K1, K5, K9, RK1, RK5, L G, J, K1, K5, K9, RK1, RK5, L G G, J, K1, K5, K9, RK1, RK5 L G, J, K1, K5, K9, RK1, RK5 K1, K5, K9, RK1, RK5 G, J, K1, K5, K9, RK1, RK5 G, J, K1, K5, K9, RK1, RK5, L G, J, K1, K5, K9, RK1, RK5, L G, K1, K5, K9, RK1, RK5 G, K1, K5, K9, RK1, RK5 G, J, RK1, RK5, L G, J, K1, K5, K9, RK1, RK5, L G, J, K1, K5, K9, RK1, RK5, L |
3.1 through 3.5.3, 3.14 and 3.15 3.6 3.7 3.8 3.9 3.9.1 3.10 3.11 3.12 3.13 |
4.7.1 4.7.2 4.7.3 4.7.4 4.7.5 4.7.5.1 4.7.6 4.7.7 4.7.8 4.7.9 |
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