MSHA - Code of Federal Regulations - 30 CFR 7.68
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MSHA - Title 30 CFR
30 CFR § 7.68
Firing line terminals test.

(a) Test procedures. (1) The contact resistance through each firing line terminal shall be determined.

(2) A 10-pound pull shall be applied to a No. 18 gauge wire that has been connected to each firing line terminal according to the manufacturer's instructions.

(b) Acceptable performance. (1) The contact resistance shall not be greater than 1 ohm.

(2) The No. 18 gauge wire shall not become disconnected from either firing line terminal.