30 U.S.C. § 866 — Trailing cables

submitted 57 years ago by Pub. L. 91-173 to r/title-30-MINERAL-LANDS-AND-MINING · 376 words · no verdicts yet

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This section sets safety rules for trailing cables in coal mines, including their construction, protection, splices, and connections.

(a) Trailing cables used in coal mines must meet the Secretary’s requirements for flame-resistant cables. This section does not define “flame-resistant cables.” (b) Each ungrounded conductor of a trailing cable must have short-circuit protection from an automatic circuit breaker or another device approved by the Secretary that is no less effective and can interrupt enough current. A device used to disconnect power from a trailing cable must be clearly marked and identified. It must let a person tell by looking that the power is disconnected. (c) If two or more trailing cables connect to the same distribution center, there must be a way to prevent a cable from being connected to a circuit breaker of the wrong size. (d) One temporary splice may be made in a trailing cable, and the cable may then be used only during the next 24 hours. A temporary splice may not be within 25 feet of the machine, except for cable-reel equipment. It must be made properly, be mechanically strong, and be well insulated. A trailing cable or hand cable may not be used if its wires are exposed or if a splice heats or sparks under load. Here, “splice” means mechanically joining one or more conductors that were cut apart. (e) A permanent splice must (1) be mechanically strong, electrically conductive enough, and flexible; (2) be effectively insulated and sealed against moisture; and (3) be vulcanized or treated with suitable materials so it is flame-resistant and bonds well to the outer jacket. (f) Trailing cables must be clamped to machines so they are protected from damage and their electrical connections are not strained. They must also be protected from mobile equipment. (g) A trailing-cable or power-cable connection to a junction box may not be made or broken while it is carrying a load.

the actual law source: uscode.house.gov ↗public domain

(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.

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.

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

history & why it existsrecord from the source credit

1969Enacted · Pub. L. 91-173 · 83 Stat. 779

A history note hasn’t been published yet. The record shows enactment by Pub. L. 91-173 on 1969-12-30.

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