26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Mine power systems can range from relatively simple installations for small surface mines to complex underground systems where the harsh environment of dust, humidity, and cramped spaces stretches the ingenuity and creativity of the engineer to provide reliable service. A vital part of any mine. Grounding is a mechanism to protect distribution equipment and people under normal operating conditions, abnormal operational (overcurrent and overvoltage) responses, and hazardous conditions such as shocks. Grounding is necessary to assure correct operation of electrical devices, to assure safety. Power from factory ground must be installed by a qualified electrician. Mining's difficult environment, dynamic power loads, cyclic and mobile operation, and stringent safety requirements all place unique demands. Several MSHA Regulations have been written that directly deal with grounding of electrical equipment at plants and quarries. These regulations, as written, are of a general nature. Safety of Personnel: By safely channeling fault currents into the ground, proper grounding helps to reduce the risk of electric shock to personnel. This helps to reduce the potential difference that exists between.