---
kind: "section"
citation: "30 C.F.R. § 75.829"
title: "30"
number: "75.829"
heading: "Tramming continuous mining machines in and out of the mine and from section to section."
url: "https://uscodex.org/cfr/30/75.829"
---

# §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](/cfr/30/75.812.md)) 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](/cfr/30/75.823..75.828.md) and [§§ 75.830 through 75.833](/cfr/30/75.830..75.833.md);
  - (3) Low-, medium-, and high-voltage cables must comply with §§ [75.600-1](/cfr/30/75.600-1.md), [75.907](/cfr/30/75.907.md), and [75.826](/cfr/30/75.826.md), 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)](#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)](#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)](/cfr/30/75.832.md?p=f) and [(g)](/cfr/30/75.832.md?p=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)](/cfr/30/75.832.md?p=f).
- (c) **Power sources.** In addition to the power center specified in [§ 75.825](/cfr/30/75.825.md), 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](/cfr/30/part75.md);
    - (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](/cfr/30/75.824.md);
    - (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.


## Notes

### Amendments

[75 FR 17549, Apr. 6, 2010]

### Source

Source: 67 FR 11001, Mar. 11, 2002, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811, 813(h), 957.

### Source

Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.

### Amendments

[75 FR 17549, Apr. 6, 2010]