Section R. 408.41724 - Electrical installationsRule 1724.
(1) Electrical apparatus and equipment used for construction operations shall bear an approved label or marking.(2) Before work begins, a competent person shall ascertain by inquiry, observation, or instruments whether any part of an electric power circuit, exposed or concealed, is so located that, in performance of the work, contact by an employee, tool, or equipment can be made with the circuit.(3) Any employee shall not be permitted to be in proximity to any part of an electric power circuit that he may contact unless the employee is protected against electric shock by de-energizing the circuit and locking out and tagging it, or unless the employee working on an energized circuit is guarded by insulation, insulated tools, or insulating matting or blankets sufficient to protect against the voltage involved.(4) Where an electrical power circuit exists that can be contacted by an employee, the employer shall do both of the following: (a) Post and maintain accident prevention signs prescribed in Part 22. Signals, Signs, Tags, and Barricades, being R 408.42201 et seq. of the Michigan Administrative Code.(b) Advise the employee of the location of the lines, hazard involved, and protective measures taken or to be taken.(5) When an employee is using a jack hammer, bar, or other tool which could come in contact with an underground line, the energy source shall be de-energized.(6) A work space of not less than 3 feet wide and 6 1/2 feet high, in addition to space necessary to open equipment doors not less than 90 degrees, shall be provided and maintained in the area of electrical equipment.(7) Barriers or other means shall be provided to ensure that the work space for electrical equipment is not used as a passageway during periods when energized parts of electrical equipment are exposed.Mich. Admin. Code R. 408.41724