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Boiler electric feed on a male 3-prong S/O cord plug?
I want to change my boiler line voltage wiring so that the boiler and circulator power is on a 3-prong male electrical (extension) cord. It will then plug into an electrical outlet right at the boiler. During a prolonged power failure I can unplug from the house wiring and then plug into a generator.
The generator will not be able to back-feed into the house wiring. But is this code legal?
As an alternative I can get an individual transfer switch for the boiler power like the attached pic. A regular 3-prong extension cord goes from generator to the transfer switch's recessed male plug. The transfer switch is double-pole, switching both neutral and hot.
Is this transfer switch code approved?