How to wire a backup generator to the house?

Wiring a backup generator in Quebec falls notably under Section 46 of the Quebec Construction Code, Chapter V — Electricity (standby power source). Section 86 of the same Code covers electric vehicle supply equipment, not generators.

Authorized methods:

• Transfer switch: A device that isolates the house from the Hydro-Québec grid when the generator is running. Required for any permanent installation. No published price covers this assembly: the cost depends on the transfer switch chosen, the amperage and the wiring, and must be itemized in a detailed quote
• Power inlet box: Outdoor NEMA L14-30R receptacle connected to the transfer switch. Allows connecting a portable generator

Safety rules:

• It is forbidden to plug a generator directly into a wall receptacle (backfeed) — dangerous for Hydro-Québec workers and a fire risk
• The generator must be installed outdoors, never in a closed garage (carbon monoxide risk); the minimum distance is the one given in the manufacturer's instructions, which also cover exhaust ventilation
• Grounding: a portable generator must have its own ground rod if not bonded to the main panel via the transfer switch

Power: it is calculated from the loads to be backed up (heating, refrigeration, lighting, pump); no typical wattage is published — capacity is sized for the case at hand.