Electrical transformer and cubicle safety rules
Transformers are the grey or green boxes found on and near front yards throughout Edmonton. Cubicles are large grey or green boxes be found near the entrance to your neighborhood. Transformers and cubicles are sometimes referred to as utility boxes or electrical boxes. These transformers and cubicles are tied to underground distribution lines, which deliver electricity to nearby households and businesses.
This equipment can be dangerous, which is why transformers typically have warning signs with messages like "Danger High Voltage" and "Danger Keep Out".
Here are some things we can all do to ensure the safety of ourselves and others when working or playing near transformers and other electrical equipment.
Report open or damaged transformers
Contact us at our 24/7 emergency line at
(780) 412-4500 if you see:
- A transformer with a door that is open or damaged
- A transformer that's been hit by a vehicle
Don't play on or near transformers or cubicles
Power transformers and cubicles can contain a variety of different utility equipment. Although they have a secure and enclosed design, they can still be dangerous. Don't play on or around these transformers or cubicles, and keep others away from them too.
Call before you dig
Transformers and cubicles are connected to buried power lines, which run power into households and businesses.
It's important to call or click before you dig near this equipment so that power lines and other utilities can be marked
before you start digging.
Once the utilities have been marked, ensure you hand exposing the utilities with a hydro vac or shovel. Do not use motor powered digging devices (e.g. excavator or auger) within 1 metre on either side of the locate marks. Also, make sure your digging area is at least 2 metres away from all sides of the transformer or cubicle. There is a ground grid buried around transformers and cubicles that is will not be indicated on the locate sheet, but still poses a safety risk if you dig to close to it.
Ph: 1 (800) 242-3447
Provide access to electrical equipment
You should always make sure there is proper access to transformers. There should be a clear 3 metre path on all four sides of the transformer.
Don't block access to the transformer with fences, shrubs, construction materials, or equipment. This ensures crews are able to quickly access the transformer, this is especially important if they are responding to an emergency outage.