Temporary generator hookup for furnace?
The cord and plug arrangement you are describing will work perfectly fine given the circumstances.
Refinement. Add a 3 way switch next to the furnace emergency switch with the red cover (perhaps using a double gang box). Connect the common terminal on one pole to the furnace lead (going to the existing emergency switch first). Connect one traveler terminal to the incoming power. Wire the other traveler terminal to a cord and plug assembly (the hot wire). This becomes your generator connection and transfer switch.
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Last edited by AllanJ; 02-01-2011 at 02:37 PM.