I am installing a 50 amp range circuit although I will be using a gas cooktop and a toaster oven in an apartment I am renovating. The gas cooktop requires a 120v ignition circuit. Am I allowed to run an additional 120V 15 amp circuit into the same junction box? The standard 50 amp box has 1/2 inch knockouts. I wont be able to tie the 15 amp and twin 50 amps with a 'three circuit' breaker. I live in Ontario, but NEC rules and regs are likely to be similar.