30 CFR § 75.827
Guarding of trailing cables.
(1) The high-voltage cable must be guarded in the following locations:
(i) From the power center cable coupler for a distance of 10 feet inby the power center;
(ii) From the entrance gland for a distance of 10 feet outby the last strain clamp on the continuous mining machine; and,
(iii) At any location where the cable could be damaged by moving equipment.
(2) Guarding must be constructed using nonconductive flame-resistant material or grounded metal.
(b) Suspended cables and cable crossovers.
When equipment must cross any portion of the cable, the cable must be either:
(1) Suspended from the mine roof; or
(2) Protected by a cable crossover having the following specifications:
(i) A minimum length of 33 inches;
(ii) A minimum width of 17 inches;
(iii) A minimum height of 3 inches;
(iv) A minimum cable placement area of two and one half-inches (2 1/2 inch;) high by four and one-quarter inches (4 1/4 inch;) wide;
(v) Made of nonconductive material;
(vi) Made of material with a distinctive color. The color black must not be used; and
(vii) Made of material that has a minimum compressive strength of 6,400 pounds per square inch (psi).