30 C.F.R. § 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.