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Yes - but you must carefully mark the "Sets of wires" to associate them - specifically to tell the next installer which hot(s) go with which neutral. I'm a little gobsmacked that you know all about MWBCs but you seem stymied by not knowing how many amps a sauna draws vs how many amps a toaster draws. Not rocket science. You have some "...


1

Likely no problem. But 3 considerations. Conduit fill, derating based on fill, capacity of the junction box. Both conduit fill and derating are dependent on wire size and insulation type. Mixing wire types and sizes makes calculations for conduit fill confusing, but generally it looks like THHN/THWN or THW, not bigger than #12. You could fit 9 THHN or 6 THW #...


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