Limits of approach

Limits of approach are the safe distances that people or equipment must maintain from exposed energized power lines or equipment, which vary depending on system voltage and the training and experience of the individual.

Where work is planned near energized high-voltage electrical conductors, Alberta OHS Code (Part 17, Overhead Power Lines) specifies the safe limits of approach that must be maintained by any worker, tool, machine, equipment or material. If the voltage is unknown and has not been verified by an EPCOR Safety Codes Officer, then maintain a clearance of at least 7 m.

Workers and equipment should adhere to the following guidelines:

Know the limits of approach for equipment and workers.
Mark the location of all overhead power lines and/or exposed underground cables on plans and drawings.
If your project might result in workers or equipment encroaching on minimum distances, you must contact EPCOR before beginning any work.

Email EPCOR at safetycodes@epcor.com for clearance requirements specific to your area and the job.

Table of contents Last updated: September 2021

EPCOR customer service:
Edmonton: 780-310-4300
Toll-free: 1-800-667-2345

Electrical contact:
Fire/threat to life call 911
Otherwise call EPCOR power trouble: 780-412-4500

Distances from overhead power lines for persons and equipment

Safe limit of approach if voltage is known

Operating voltage of overhead power line between conductors	Safe limit of approach distance for persons and equipment
0 - 750 Volts insulated or polyethelene covered connectors ¹	300 millimetres
0 - 750 Volts bare, uninsulated	1.0 metres
Above 750 Volts insulated conductors ^{1, 2}	1.0 metres
0.75 kV to 40 kV	3.0 metres
69 kV, 72 kV	3.5 metres
138 kV, 144 kV	4.0 metres
230 kV, 260 kV	5.0 metres
500 kV	7.0 metres
500 kV DC Pole-Ground	7.0 metres

Conductors must be insulated throughout their entire length to comply with these groups.
Conductors must be manufactured to rated and tested insulation levels

Disclaimer

EPCOR Distribution & Transmission Inc. (EPCOR) is responsible for the delivery of electricity to customers in Edmonton and surrounding areas, while being fully committed to the protection of the environment and the health and safety of our employees and customers.

This guide provides information to employers and contractors regarding safe work practices in relation to EPCOR power facilities. Employers and contractors have responsibilities under the Alberta Occupational Health and Safety (Alberta OHS) Act, Code, and Regulation. When there is a conflict between this document and any bylaws, legislation, or regulation the relevant law prevails.

Any reliance placed on this information is strictly at your own risk. EPCOR does not assume any responsibility or liability for any action, loss or damage that arises out of, or is in connection with the information contained in this guide.

Alberta safety legislation assigns responsibilities to the utility owner, the contractor, the employer, and the worker, to ensure that work is carried out in a safe manner. All work related hazards must be identified by the employer to the workers. Only competent workers are allowed to work without direct supervision. All work shall be carried out in accordance with applicable legislation.

View our guidelines for Working in Close Proximity to Electrical Equipment.