---
kind: "section"
citation: "30 C.F.R. § 7.65"
title: "30"
number: "7.65"
heading: "Critical characteristics."
url: "https://uscodex.org/cfr/30/7.65"
---

# §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.**

## Notes

### Source

Source: 54 FR 48210, Nov. 21, 1989, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 957.

### Source

Source: 53 FR 23500, June 22, 1988, unless otherwise noted.