Originally posted by: Rubycon
Originally posted by: RedSquirrel
If it touches the element it will be a path of less resistence so the electricity will skip the element and go through the foil. Maybe? Don't know.. then again it would do it with metal pans too...
If you put the foil under the element just keep a safe distance from where the element plugs in. That's 240 volts, you don't want that doing a parrallel arc since that will be nasty...
The electric element is actually a casing that's at ground potential. The resistance (heating) wire made of nickel-chromium alloy (nichrome) is much thinner and sits in the middle of the casing. High temperature dielectric refractory not much different than diatomaceous earth surrounds this wire. This is why it takes long for the casing to get hot - glowing hot on HIGH - after first turned on.
It's true that Al foil can make its way near the lugs which have 120VAC respective to ground which can cause a fault. On newer ranges with AFCI protection it will trip faster than you can say arky sparky. On regular ranges though it can arc and start a nasty fire.
Sometimes larger elements in the bottom of ovens can fault themselves and burn along the outer casing. If allowed to continue the results can be spectacular!
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Some believe the foil can work as a reflector collimating the longwave IR causing the element to overheat and fail prematurely like above. I have no idea if this is really the case.