this it right from the esasafe site.
http://www.esasafe.com/faqs.htm Question
I am having twenty pot lights with 60 watt bulbs installed in my basement ceiling. Can they all go on the same circuit?
Answer
Yes. Where the load is known the Code permits more than 12 outlets on a 15 amp circuit provided the total load current does not exceed 12 amps. In this case each fixture will draw 60 watts or .5 amps for a total load of 20 x .5 amps = 10 amps, which is below the 12 amp maximum.
The above assumes the marked maximum lamp size on the fixture is 60 watts; if the marked maximum lamp size is larger, then the marked lamp size will have to be used in the calculation.
No other loads shall be connected to this circuit.
Rule 8-304.
Ontario Electrical Safety Code 24th Edition/2009.
