Number of receptacles and size of wires
With the proviso that you are in Canada and things there don't follow NEC...
1.) In NEC there is no limit on the number of receptacles on a general purpose circuit. There MAY be practical limits you'd like to impose yourself. Depending on the size of your basement, there are certain circumstances where you can run into limits on the number of square feet a circuit can serve - but again, how does that apply in Canada?
2.) NEC does not prevent you from upsizing your wires, nor does it require you to use a larger wire in the circumstance you are talking about. If you are purchasing Romex (or any other NM) in 14awg vs 12awg, you don't need to worry too much about the size of the EGC (bare wire) - as the commonly available NM in those sizes has the EGC the same size as the current carrying conductors.
What the NEC requires is that your circuit breaker be sized to protect your wires. There is nothing in NEC that says your breaker won't trip constantly because you decided to plug too many devices into the receptacles. This is above and beyond what NEC requires, but if it was me, I'd add up the amperage of the devices you expect to plug in... if that's over 10A and you were planning on doing 14awg (15A breaker), then I'd bump up to 12awg (20A breaker). If you were going to plug in over 15A of devices, I'd break it into multiple circuits.
Last edited by IvoryRing; 06-23-2006 at 10:23 AM.