Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-1108. Capacity

All electrical apparatus and conductors shall be sufficient in size and power rating for the work they may be called upon to do, and as hereinafter prescribed, efficiently covered or safeguarded, and so installed, operated and maintained as to reduce danger from accidental shock or fire to the minimum, and shall be of such construction, and so operated, that the rise in temperature caused by ordinary operation will not injure the insulating materials. Where these conditions are not met, affected equipment shall be removed from service until corrective action is taken.