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We have a small OEM machine that normally runs on 220v single phase, and we're adapting it to run in a plant with only 120v. General questions about disconnect, fusing, and a transformer to step-up to 220v for the heater.
When you have an industrial machine that runs on 120v, is it common to run both the hot leg (L) and the grounded conductor (N) through the main disconnect switch on the machine? The machine normally runs both legs of incoming 220v through the main machine disconnect, but for 120v can anyone confirm that both L and N should be run through the disconnect? Or should L be the only leg switched?
There is only one component (heater) on the machine that requires 220v, so we will have a small single-phase transformer to step-up the voltage. So I'll energize the primary of the transformer with 120v and only the hot leg fused, and on the secondary will be just an SSR and a heater cartridge. Should I fuse both legs of 220v on the secondary? Or should I ground one leg and fuse the other?
When you have an industrial machine that runs on 120v, is it common to run both the hot leg (L) and the grounded conductor (N) through the main disconnect switch on the machine? The machine normally runs both legs of incoming 220v through the main machine disconnect, but for 120v can anyone confirm that both L and N should be run through the disconnect? Or should L be the only leg switched?
There is only one component (heater) on the machine that requires 220v, so we will have a small single-phase transformer to step-up the voltage. So I'll energize the primary of the transformer with 120v and only the hot leg fused, and on the secondary will be just an SSR and a heater cartridge. Should I fuse both legs of 220v on the secondary? Or should I ground one leg and fuse the other?