MSHA - Code of Federal Regulations - 30 CFR 7.65
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MSHA - Title 30 CFR
30 CFR § 7.65
Critical characteristics.

The following critical characteristics shall be inspected or tested on each blasting unit to which an approval marking is affixed:

(a) The output current.

(b) The voltage cut-off time.

(c) The components that control voltage and current through each making and breaking electric contact.

(d) Operation of the visual indicator and the firing switch.