30 CFR 7.66
§ 7.66 Output energy test.
United States · 30 CFR — Mineral Resources · Status: effective
Cite this
- Citation
- 30 CFR 7.66, § 7.66 Output energy test, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/131602
- Permanent ID
ys:prov:131602@1- SHA-256
5131f693fc9b038e9f4a494f3111c47d6fd8a8d7b1eef61594a1a4121d0b88c8
The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.
Full text
(a) Test procedures. The blasting unit shall be tested by firing into each of the following resistive loads, within a tolerance of ±1%:
(1) The maximum blasting circuit resistance.
(2) Any resistive load between 3 ohms and the maximum blasting circuit resistance.
(3) One ohm.
(b) Acceptable performance.
(1) The voltage shall be zero at the firing line terminals 10 milliseconds after operation of the firing switch.
(2) The electric current from the blasting unit shall be:
(i) Less than 50 milliamperes except during firing of the blasting unit.
(ii) Available only through the firing line terminals.
(iii) At least an average of 2 amperes during the first 5 milliseconds following operation of the firing switch.
(iv) Not exceed an average of 100 amperes during the first 10 milliseconds following operation of the firing switch.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.