Blue Book

Low-Voltage Electrical Service
Standard E.21-10 (9^th edition)

This standard sets out the conditions for low-voltage electricity service. More specifically, it deals with permanent and temporary connections to the overhead or underground distribution system and metering of low-voltage supply. It is designed to provide Hydro-Québec employees, master electricians, consulting engineers and manufacturers with information on implementing or modifying electrical installations.

• Standard E.21-10 (9^th edition) [PDF – 4.0 MB]
• Leaf through
• Approved Products [PDF]

Further information

• Site for master electricians [In French only]