Editorial Note on Part 75
Editorial Note: The provisions of this part marked [Statutory Provision] appear in Title III of the Federal Coal Mine Health and Safety Act of 1969.

§ 75.829 Tramming continuous mining machines in and out of the mine and from section to section. ( a ) *Conditions of use.* Tramming the continuous mining machine in and out of the mine and from section to section must be done in accordance with movement requirements of high-voltage power centers and portable transformers (§ 75.812) and as follows: ( 1 ) The power source must not be located in areas where permissible equipment is required;
( 2 ) The continuous mining machine must not be used for mining or cutting purposes, unless a power center is used in accordance with §§ 75.823 through 75.828 and §§ 75.830 through 75.833;
( 3 ) Low-, medium-, and high-voltage cables must comply with §§ 75.600-1, 75.907, and 75.826, as applicable; and
( 4 ) The energized high-voltage cable must be mechanically secured onboard the continuous mining machine. This provision applies only when using the power sources specified in paragraphs (c)(2) and (c)(3) of this section.
( b ) *Testing prior to tramming.* Prior to tramming the continuous mining machine, ( 1 ) A qualified person must activate the ground-fault and ground-wire monitor test circuits of the power sources specified in paragraph (c) of this section to assure that the corresponding circuit-interrupting device opens the circuit. Corrective actions and recordkeeping resulting from these tests must be in accordance with §§ 75.832(f) and (g).
( 2 ) Where applicable, a person designated by the mine operator must activate the test circuit for the grounded-phase detection circuit on the continuous mining machine to assure that the detection circuit is functioning properly. Corrective actions resulting from this test must be in accordance with § 75.832(f).
( c ) *Power sources.* In addition to the power center specified in § 75.825, the following power sources may be used to tram the continuous mining machine. ( 1 ) *Medium-voltage power source.* A medium-voltage power source is a source that supplies 995 volts through a trailing cable (See Figure 1 of this section) to the continuous mining machine. The medium-voltage power source must— ( i ) Not be used to back-feed the high-voltage circuits of the continuous mining machine; and
( ii ) Meet all applicable requirements for medium-voltage circuits in 30 CFR 75.
( 2 ) *Step-up transformer.* A step-up transformer is a transformer that steps up the low or medium voltage to high voltage (See Figure 2 in this section) and must meet the following requirements: ( i ) The trailing cable supplying low or medium voltage to the step-up transformer must meet the applicable requirements of 30 CFR part 75;
( ii ) The high-voltage circuit output of the step-up transformer supplying power to the continuous mining machine must meet the applicable provisions of § 75.824;
( iii ) The step-up transformer enclosure must be— ( A ) Securely mounted to minimize vibration on: ( 1 ) The continuous mining machine; or
( 2 ) A sled/cart that must be connected to the continuous mining machine by a tow-bar and be in close proximity to the mining machine.
( B ) Grounded as follows: ( 1 ) Connected to the incoming ground conductor of the low- or medium-voltage trailing cable;
( 2 ) Bonded by a No. 1/0 A.W.G. or larger external grounding conductor to the continuous mining machine frame; and
( 3 ) Bonded by a No. 1/0 A.W.G. or larger external grounding conductor to the metallic shell of each cable coupler.
( C ) Equipped with: ( 1 ) At least two interlock switches for each of the enclosure covers; and
( 2 ) An external emergency stop switch to remove input power to the step-up transformer.
[75 FR 17549, Apr. 6, 2010]