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dvandoren01 asked (208+120)&3-phase on same circuit?
I currently have an outlet that is wired for 3-phase + neutral. It's trimmed out currently to be a 208 single phase (extra leg and neutral capped off). The breakers are setup so 2 of the 3 legs (the 208) are breakers strapped together and the extra leg is on its own (all 3 are 30-amp). I have a few devices consisting of 1-phase 120, 1-phase 208, and 3-phase 208. I would like to have the ability to run any device from this circuit, how-ever they will not be ran at the same time. I was thinking of making a control box that uses relays to be able to select 208+120 or 208 3-phase. The box will be plugged into an outlet that will feed it all 3 phases, neutral and ground. What do I need to worry about when doing this? (dont worry, Im a competent electrical/mechanical engineer with a background in high voltage, high current... how-ever Im dont know much about code or electrician's ways.) -does all 3 breakers in the main panel need to strapped together? Or leave it as is? or make them all individual? -Does code allow me to make a relay box to select which power config I want? It will be a select-off-select design, so all legs are disconnected before switching to next configuration. -Do I need to include redundant breakers in my box? They make DIN rail breakers that could work if I do. -Is there a commercial solution for this? Im trying to do this for between $200-$400. Any other advice would be greatly appreciated! PS- At first I was thinking of just branching the circuit and adding electrical boxes trimmed to the device requirements, but I was afraid of un-even loading of the legs, or the possibly of someone trying to run all devices at the same time.
And got the following answer:
I did put a single phase 208v and 3-phase receptacle on a single 3 phase breaker, and got it inspected and passed in the city of Seattle, the inspector agreed it was a little unusual, but didn't see a problem as long as the equipment wasn't permanently mounted in place. I don't see how using a single phase 120v would be significantly different. The two points we discussed was outlet circuits normally contain multiple outlets that are not expected to be used all at the same time at capacity, and a three pole circuit breaker can be used in place of handle ties for two legs of a multiwire branch circuit sharing a neutral. The one thing you said that I would caution about it is 30 amp circuits are limited to 30 amp receptacles (unlike how 20 amp 120v circuits can have 15 and 20 amp receptacles), and your equipment my not adequately protect equipment that doesn't normally operate above 20 amps. Yes, the breakers need to be strapped together, actually now the code requires any circuits that share a neutral to be tied together. If you are really concerned about accidentally using multiple outlets overloading the circuit then you could just install switches and label them, or you could use a motor reversing contactor, they have interlocks that prevent both contactors for operating. Uneven loading at 30 amps is not significant.
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