Who can do electrical installations?
Apart from doing electrical work in your own primary residence, in Ontario no one can perform any electrical work or have work inspected apart from a licensed electrical contractor. ESA, or the Electrical Safety Authority, is the body with the authority to set the rules governing all electrical installations. They have a very informative website that explains the reasoning behind regulating the trade.
http://www.esainspection.net/
Some small renovation contractors feel comfortable doing their own electrical installations, and at one time any licensed electrician could take out a permit. No any longer; ESA lists builders who have been taken to court for attempting electrical work without being qualified.
How do you become a contractor? First, you must serve an electrical apprenticeship and once licensed, keep your annual fees paid up. Then, you take a masters course for about a thousand dollars, and pay $60.00 annually to keep your masters active. Then pay in excess of a thousand dollars annually for liability insurance. Then you may apply for and meet the conditions of a contractors license, at about $400. annually in advance. Then, apart from personal injury insurance, WSIB, GST, Revenue Canada, Vehicle costs, etc, you are ready to start doing electrical installations.
I can not tell you if contractor licensing has had the desired effect of controlling the electrical trade, dealing with unqualified people doing electrical work. If the amount of material being sold by big box stores is any indication, the answer is no. Either way, my overhead as a contractor doubled and the costs must be passed on by me and every other legitimate contractor in Ontario. I do, though, strongly encourage using a reputable contractor. Your brother-in-law might very well be a handy person, but if he isn't a licensed contractor who has paid his dues and has an ESA/ECRA number in the format of 700****, he doesn't have the right to help you with your wiring.