208v 12/2 mc to central junction

[jhamil007]

208v 12/2 mc
The white is used as a ungrounded conductor and the ground is tied in with other ground wires in junction box. IS this legal? what is the nec code ref I need to use to inform my boss? The best I could come up with was 200.4 thru 200.7C in the 2017 book.

 

[hbiss]

No different than tying all your Romex grounds together and pigtailing it to the box. Not only is it legal, but it's also required. You are maybe thinking of keeping the neutrals from different circuits separate if they are in the same box.

-Hal

 

[jhamil007]

Thank you for such a fast response! Yes! I am thinking of keeping my Neutrals separated and identified properly. we have a 5s box on the end of a run using 1" EMT that will have several conductors in it by the end of the week. My thought is that it needs to be phased taped at the receptical and back at the junction box that the MC attaches too with a isolated line back to the panel. so is not to confuse it with other circuits and possibly have a returning hot wire back to the panel intermixed with the other ground wires. My boss just wants me to tie it in.?

 

[augie47]

Trying to decipher.**
a. You are correct, 200.7 requires anytime a white conductor in a cable assembly such as MC is used as a phase conductor it should be reidentified
anywhere the conductor is visible and accessible.
b. "ground is tied in with other ground wires in junction box" IF you are referencing the groundED conductor (NEUTRAL) then they should NOT all be tied together in the j box {violation 310.10(H)} and the individual neutral should be identified or grouped with it's corresponding phase conductor in the box and the panel (200.4)

** Note: It is important to identify groundED (neutral) vs. groundING conductors in your posts as opposed to "ground"...they are obviously treated differently.

Curious: How many and what size conductors do you have in you 1" conduit ?

 

[infinity]

Thank you for such a fast response! Yes! I am thinking of keeping my Neutrals separated and identified properly. we have a 5s box on the end of a run using 1" EMT that will have several conductors in it by the end of the week. My thought is that it needs to be phased taped at the receptical and back at the junction box that the MC attaches too with a isolated line back to the panel. so is not to confuse it with other circuits and possibly have a returning hot wire back to the panel intermixed with the other ground wires. My boss just wants me to tie it in.?

All of the EGC's get connected together (please don't call then grounds or ground wires) and to the metal box. What do you mean by keeping the neutral separated? Your 208 volt circuit with a 12/2 MC cable has no neutral.

 

[kwired]

You are marking the white conductors because they are not being used as a grounded conductor. If you have other circuits in same raceway/junction box that are utilizing a neutral then those neutral conductors must be white. You also can not use white or gray for an ungrounded conductor in the raceway, just in a cable or cord assembly that leaves you with no other choice of conductors to use for the ungrounded. Green is always EGC though, there is no place I am aware of in NEC that allows it to be re identified. Won't say I never seen it done though.