Guidance about working with high voltage (HV) electricity

On 31 March 2022, the Work Health and Safety (WHS) laws replaced the health and safety elements of the Mines Safety and Inspection laws. For information visit

Transitional arrangements may be in place for the compliance requirements on this page.

All health and safety notifications, forms and guidance for mining and petroleum has moved to the WorkSafe website

What is high voltage (HV) electricity?

Electricity is classified as high voltage (HV) if it exceeds 1,000 Volt AC or 1,500 Volt DC. Equipment and conductors that carry high voltage have specific safety requirements and procedures.

In alternating current (AC), the flow of electric charge periodically reverses direction, whereas in direct current (DC), the flow of electric charge is in one direction.

HV submissions

Details of any proposed HV electrical installation on Western Australian mine sites must be provided to the department prior to installation. A design submission must be made for any significant change to HV installations, as well as the initial construction. This ensures an appropriate design and also notifies the regulator so an inspection can be arranged.

Refer to r. 5.18(2)(a) of the Mines Safety and Inspection Regulations 1995