Here is the answer in Ontario, Canada.
Under the OH&S act and enforced by the Ministry of Labour, not the Inspection Department.
OH&S Act & Regulations-1999-page #60.
(Excerpts)
Adoption of Training Requirements
1) The requirements for certification of trades prescribed in the regulations made under the Trades Qualification Act and set out in the schedule are adopted and prescribed in the standard with which every worker in those trades must comply.
3) Every employer who employs a worker in a trade set out in the schedule, other than a apprentice as defined in section 1 of the Trades and Qualifications Act, shall ensure that the worker holds a subsisting certificate of qualification in that trade or equivalent certificate of qualification issued by the province of Quebec.
Schedule:
Electrician, branch 1: construction & maintenance electrician
Electrician, branch 2; domestic and rural electrician
Tony Moscioni
Electrical Inspector
Electrical Safety Authority
