"consider using crimp caps on the multiwire neutral splices" Like the idea, but experiance drives me the other way. Did many years of service work where crimps in current carrying conductors would fail. They heat slightly in use, and due to evironmental temp changes, and eventually work loose under load, and start to arc. I don't even like them for grounding. But if twited AND crimped, I might be OK with that...
"So if we have 2 of the circuits at 20a each and the third circuit has nothing plugged into it."
(Assuming they are 20 circuits...) If you have a circuit pushing a full 20A there are going to be problems anyway.
![[Linked Image]](https://www.electrical-contractor.net/ubb/wink.gif)
Try to keep the loads even and well below 80%... Even if you had that scenario with 2 @ 20A on a wye system the neutral load won't be more than 20A. And if one was slighly higher or lower, it would go down, instead of up. Say A were @ 15A, B @ 10A, C @ 0A, N @ ~13A... #12 THHN is actualy rated for 30A. (Before derating, or 240.4d) With a 2-wire circuit on a wye system @ xA, the neutral is xA, with no chance for the
benefit of an unbalanced load to offset it. IMO
"To the guys that like the use, do you mark the shared nuetral somehow in j/device boxes?" We normaly group the conductors of one roundhouse together with some tape, or a different colored lettering on each. So say I had two, 4-wire circuits... One circuit would have all the conductors in that circuit with a wrap of tape normally. We do the same for 2-wire circuits so we don't mix them up... Some of the larger supply houses, if you order in advance, can get you different colors on the lettering, but that is only usefull if you are doing a WHOLE job, not very usefull on remodels. And you can get stripped wire in different colors if you have more than one transformer in the building.
