TOPIC: wire guage compared to fuse size for electric heater

wire guage compared to fuse size for electric heater 14 years 9 months ago #27801

Bert de Haan Topic Author Offline Platinum Member If it is worth doing, it's worth doing well. Posts: 741 Thank you received: 0	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. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
	Please Log in to join the conversation. 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. Keywords: Kitchener-Waterloo home inspector, Guelph home inspection,... Last Edit: by Bert de Haan.

Re: wire guage compared to fuse size for electric heater 14 years 9 months ago #27853

Frank Newman Offline Premium Member Posts: 134 Thank you received: 0	Must be a Canadian thing - I don't think it would ever be acceptable in the US. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: wire guage compared to fuse size for electric heater 14 years 9 months ago #27854

Bert de Haan
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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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Re: wire guage compared to fuse size for electric heater 14 years 9 months ago #27970

Fred Sweezer Sr
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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.

Fred Sweezer Sr
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fax 361-5996
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