Backup power in Ontario
Electricians for generators and transfer switches.
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What applies across Ontario
Electrical Safety Authority: you must file a notification of work with ESA to connect a generator permanently to your home's electrical system, and a permanently connected standby generator must have a transfer device. ESA strongly recommends a Licensed Electrical Contractor.
ESA says to ask an electrical contractor for its licence number and check it with ESA's Find a Contractor tool; a Licensed Electrical Contractor files the notification of work with ESA and can give you ESA's Certificate of Acceptance when the job is done.
Before you hire
A generator wired into your home needs an approved transfer switch, fitted under a permit, so it can’t feed power back into the lines. Plan it before you buy.
Get written quotes from at least three contractors for the same work, and check references from recent clients.
Put it in a written contract: the work, price, deposit, start and finish dates, warranty, permits and clean-up. Paying cash to skip it leaves you no recourse.