Electric Water Heater Wiring
Hi, new here but it seems like a knowledgeable site.
Ive been looking into a water heater timer, and upon locating the circuit found out it still has aluminum wiring. Its a fuse panel so there was one 20A fuse on each side used to give 240v. This wiring is 14ga BX at best..though it looks thinner than the 14ga copper conductors. The water heater has 3000w upper and 3000w lower elements, non simultaneous operation, though it says max 4500w...not sure if this is actual or maybe the tank itself isnt fix for an element larger than that.
A friend of mine whos an electrician here in Ontario (canada) told me that code states here that you cannot exceed 75% of current overload device(Im taking this as fuse/breaker). That said, and assuming the wiring is #14, the fuse should be 15A, 75%15A=11.25A. When i clamp meter the hots they're 12A...thus making 15A fuse inadequate, while a 20A fuse on #14 is also wrong.
So, ideally I would need to have 20A fuses with #12 BX? OR am I way off in my calculations LOL