Equipment Grounding Conductor

[Alwayslearningelec]

In the spec I am reading it calls to install a equipment grounding conductor for all feeders and branch circuits. If I have a 6 circuit homerun( #10's) there should be 6 hots, 2 neutrals( I have to reference spec) and how many grounds?

Thanks.

 

[tyha]

youu would only need one ground unless one of the items you are feeding is an isolated ground recp. Which is highly unlikely that you would not already know if it was. But you need to watch out because if those 6 circuits are MWBC you need 6 neutrals

 

[hillbilly]

Not nearly enough information.

Your terminology doesn't sound correct.

You say that this is a "6 circuit homerun"....what exactly is that?

What is the voltage?....breaker sizes?

Do you have a NEC code book?
Read Article 250.

steve

 

[electricguy61]

If your asking about NEC: generally, just as you'd only have one metal conduit, (EMT or Rigid metallic), and that can act as the grounding conductor, so you only need to pull one grounding conductor, sized to the largest current carrying conductor. Of course, there are exceptions, such as isolated ground circuits. NEC 250

If you're reading specs on a set of prints or reqs, you should ask the EE or whomever wrote the spec if you're not clear about the requirements.

Edit: I just type too slow!

 

[Alwayslearningelec]

They are 20a lighting circuits 120/208. TYHA what is MWBC?

Thanks guys, I know this is very remedial and you guys probably could make some sarcastic remarks toward my post.

 

[ptonsparky]

Multi Wire Branch Circuit
Shared neutral.

 

[Alwayslearningelec]

NIIIICEEE! Thanks PTON

 

[infinity]

youu would only need one ground unless one of the items you are feeding is an isolated ground recp. Which is highly unlikely that you would not already know if it was. But you need to watch out because if those 6 circuits are MWBC you need 6 neutrals

Why would 6 circuit need 6 neutrals if they're MWBC's?

 

[George Stolz]

I think he was being stupid-clever. Six MWBCs would also be called six full boats, or 3x6 ungrounded and 6 grounded conductors.

I think it's readily evident the OP was asking about two MWBCs, or two "full boats."

Horsegoer, an easy way to think about it is you are preparing for a single circuit (the largest in the conduit) to have a ground fault path at any given moment in time. While two seperate circuits fed from the "A" phase could fault simultaneously, we don't really have to worry about it, it's unlikely. So one EGC is all that's required (sized for the largest conductor in the raceway.)

 

[bjp_ne_elec]

horsegoer - is this a 3-phase system? If not, then the 6 hots, 2 neutrals won't work.