republic-os/legal/us/code/title-30/chapter-22/section-866.md

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LegalText	30 U.S.C. § 866	Trailing cables	us	united_states_code	code_section	30	MINERAL LANDS AND MINING	22	MINE SAFETY AND HEALTH	866	30 U.S.C. § 866	current	119-100	2026-06-26	official	https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc30@119-100.zip	/us/usc/t30/s866	data/legal/raw/us/code/title-30/usc30.xml	a0cf06297193dbbbec5c783a036f80c553d5e586d3392c9da899e0f10c087d08	355f8eb5c6ad5372de4a8e665d9ed90202d53d2aac19ac001d43948af4a4dd2f	07d4885bd5c286d42916d6384c4559fcd307971751d90020825cca683d2a7ecf	2026-07-04	official	legal us-code

30 U.S.C. § 866 - Trailing cables

Text

(a) Requirements established for flame resistant cables Trailing cables used in coal mines shall meet the requirements established by the Secretary for flame-resistant cables.

(b) Circuit breakers; markings and visual observation of position of disconnection devices Short-circuit protection for trailing cables shall be provided by an automatic circuit breaker or other no less effective device approved by the Secretary of adequate current-interrupting capacity in each ungrounded conductor. Disconnecting devices used to disconnect power from trailing cables shall be plainly marked and identified and such devices shall be equipped or designed in such a manner that it can be determined by visual observation that the power is disconnected.

(c) Distribution center junctions; safety connections When two or more trailing cables junction to the same distribution center, means shall be provided to assure against connecting a trailing cable to the wrong size circuit breaker.

(d) Temporary splices; usable period; exceptions; quality One temporary splice may be made in any trailing cable. Such trailing cable may only be used for the next twenty-four hour period. No temporary splice shall be made in a trailing cable within twenty-five feet of the machine, except cable reel equipment. Temporary splices in trailing cables shall be made in a workmanlike manner and shall be mechanically strong and well insulated. Trailing cables or hand cables which have exposed wires or which have splices that heat or spark under load shall not be used. As used in this subsection, the term “splice” means the mechanical joining of one or more conductors that have been severed.

(e) Permanent splices; quality When permanent splices in trailing cables are made, they shall be—

(1) mechanically strong with adequate electrical conductivity and flexibility;

(2) effectively insulated and sealed so as to exclude moisture; and

(3) vulcanized or otherwise treated with suitable materials to provide flame-resistant qualities and good bonding to the outer jacket.

(f) Clamping of cables Trailing cables shall be clamped to machines in a manner to protect the cables from damage and to prevent strain on the electrical connections. Trailing cables shall be adequately protected to prevent damage by mobile equipment.

(g) Making and breaking of connections to junction boxes Trailing cable and power cable connections to junction boxes shall not be made or broken under load.

(Pub. L. 91–173, title III, § 306, Dec. 30, 1969, 83 Stat. 779.)

Notes

Statutory Notes and Related Subsidiaries

Effective DateSection operative 90 days after Dec. 30, 1969, except to the extent an earlier date is specifically provided for in Pub. L. 91–173, see section 509 of Pub. L. 91–173, set out as a note under section 801 of this title.