I have a pet peeve when it comes to this common mistake.
Red emergency switch.
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According to building codes a furnace must be supplied by a dedicated circuit meaning the circuit cannot supply power to anything other than the furnace.
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How the furnace switch works.
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This circuit is served by its own circuit breaker in the breaker box properly called the main service panel the circuit wiring runs from the service panel to the disconnect switch and from there to the furnace.
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Years ago as i recall the furnace switch always had a red cover and was labelled furnace emergency on off.
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Mouser part.
Furthermore the switch was always located in the stairwell high up on the wall where it was very unlikely someone would mistake it for a light switch.
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