4. Selection of wire material
Blasting risk environmental risk level 1 The area within the distribution line should use copper wire or cable. In the case of severe vibration, multi-strand copper cables or multi-strand copper wires should be used. Aluminum core power cables shall not be used in underground coal mines.
Blasting risk environmental risk level 2 is within this range, the power line should be made of aluminum wire or cable with a cross-sectional area of 4mm2 or more, and the cross-sectional area of the lighting line should be 2.5mm2. and above the aluminum core wire or cable.