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TOPIC: wire guage compared to fuse size for electric heater

wire guage compared to fuse size for electric heater 12 years 7 months ago #27801

  • Bert de Haan
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What is the reason that a dedicated circuit for for an electric heater can have a 20 amp fuse for #14 wire and a 30 amp fuse for #12 wire?
Thanks

edit:  Apparently this is a Canadian code thing.

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Bert de Haan
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Benchmark Home Inspection Services Kitchener-Wateroo and Guelph area Home Inspection
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Re: wire guage compared to fuse size for electric heater 12 years 7 months ago #27853

Must be a Canadian thing - I don't think it would ever be acceptable in the US.

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Re: wire guage compared to fuse size for electric heater 12 years 7 months ago #27854

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I found something.  It has something to do with a dedicated circuit not likely getting overloaded by adding appliances so it can be designed for full load.  The breaker can be 125% (I think) of the load.  To me it seems like an exception that may save a couple of dollars but I'm not convinced it is worth those few dollars.

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Bert de Haan
www.KitchenerWaterlooHomeInspector.ca
Benchmark Home Inspection Services Kitchener-Wateroo and Guelph area Home Inspection
Serving Kitchener-Waterloo, Guelph, Orangeville, Mount Forest and surrounding areas.
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Re: wire guage compared to fuse size for electric heater 12 years 7 months ago #27970

Amps times Volts equal Watts basic to deciciding if number 14 wire will work or number 12, if the heater is 1200 watts it will have 10 amps, that is all you will be able to use without tripping the breaker if you had any thing else on the system there is a chance to that you will trip the breaker.

If this had been a 20-amp circuit —one with thicker, No. 12 wire that could carry 2,400 watts—the breaker wouldn’t have tripped. But once the wire is in the wall and the breaker is in the breaker box, there’s not much you can do to upgrade an established circuit.


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