Hi,
Upgrading an existing breaker can be done without the use of an electrician. I would pick up a copy of the simplified version of the canadian electric code (I think Revy and HD have it...its a red book that is 1/4" thick). It contains most of the imformation for safe installation of domestic electrical system (like spas, domestic switchgear and junction boxes).
In a normal breaker box, there are two sets of breakers. There is one set that controls the individual circuits that spread around your house. These are compact switches that trip when a particular circuit is overloaded. So these are called circuit breakers. The other set, is the house breaker...it is usually a double throw breaker and it is quite large. Usually, the numbers 100, 200 or 400 are written on the breaker.
If you are thinking about the house/main breaker...forget DIY. It usually costs around $1000 to $1500 for this type of job.
If it is just the circuit breaker, then you'll need to buy that book and figure out what is needed. Like Tau2301 said, most houses use 14 guage wire for 15 amp service. 12 guage for 20 amp service. You can DIY this, but you'll need to invest some time on the book and equipment.
The cost will depend on if you have room in your existing box. If there are empty slots in your box and your are not constantly tripping the main breaker, then it is a fair simple exercise. Put in a new breaker. Run some wire between the breaker to the new outlets. Wire the outlets and breaker together. Throw the circuit breaker...done. The hard part is actually running the wire so that you can't see it. I would say about $25 in parts if DIY or $100 to $500 for a professional. If the box is full and it is on the verge of overload, then it will cost you -- $1000 to $1500.
- Victor.
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