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Old 09-18-2011, 09:42 PM   #16
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Multiple circuits (separate neutral) in a conduit with receptacles


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Originally Posted by Code05 View Post
And you will bond all boxes, right?
I am confused between bonding and grounding.

I will connect ground wire to each box anyway. Is that the same as bonding?

I also forgot to let you know that this will be EMT conduit. I thought I could be off with this if I use EMT conduit with proper connection at the sub panel and junction boxes

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Old 09-19-2011, 07:51 AM   #17
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Multiple circuits (separate neutral) in a conduit with receptacles


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Originally Posted by thone View Post
I am confused between bonding and grounding.
Forget it. For you, they are the same.

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I will connect ground wire to each box anyway. Is that the same as bonding?
Sounds good.

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I also forgot to let you know that this will be EMT conduit. I thought I could be off with this if I use EMT conduit with proper connection at the sub panel and junction boxes
Not quite sure what you are saying here. EMT is fine.
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Old 09-19-2011, 08:48 AM   #18
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Multiple circuits (separate neutral) in a conduit with receptacles


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And you will bond all boxes, right?
All ground wires (equipment grounding conductors) are connected (bonded) together wherever they come together. A metal box must be bonded to ground as well, for example using a pigtail to the bundle of ground wires or by appropriate properly installed conduit.
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Last edited by AllanJ; 09-19-2011 at 08:54 AM.
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Old 09-19-2011, 09:14 AM   #19
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Multiple circuits (separate neutral) in a conduit with receptacles


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All ground wires (equipment grounding conductors) are connected (bonded) together wherever they come together. A metal box must be bonded to ground as well, for example using a pigtail to the bundle of ground wires or by appropriate properly installed conduit.
I know 250.148 well.
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Old 09-19-2011, 09:32 AM   #20
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Multiple circuits (separate neutral) in a conduit with receptacles


Thone, here are a couple of pics for you.



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Old 09-19-2011, 12:20 PM   #21
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Multiple circuits (separate neutral) in a conduit with receptacles


Thanks - Code05.

I notice that, in the picture, they are using multiple ground wires within one conduit. Can I use only one ground (same #12 as other conductors?) for each conduit?. I believe I don't even need a ground wire since I will be using EMT (and I can also use it as EGC), but just to be safe.
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Old 09-19-2011, 02:21 PM   #22
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Multiple circuits (separate neutral) in a conduit with receptacles


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Thanks - Code05.

I notice that, in the picture, they are using multiple ground wires within one conduit. Can I use only one ground (same #12 as other conductors?) for each conduit?. I believe I don't even need a ground wire since I will be using EMT (and I can also use it as EGC), but just to be safe.
Yes one #12 is sufficient.

No, you do not have to install a wire EGC if you do not want to. The EMT can be the EGC, but there are other rules you must follow.

I recommend the wire EGC for a DIY installation.
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Old 09-19-2011, 04:38 PM   #23
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Multiple circuits (separate neutral) in a conduit with receptacles


Quote:
Originally Posted by thone

I am confused between bonding and grounding.

I will connect ground wire to each box anyway. Is that the same as bonding?

I also forgot to let you know that this will be EMT conduit. I thought I could be off with this if I use EMT conduit with proper connection at the sub panel and junction boxes
When using EMT, you dont need the EGC
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Old 09-19-2011, 06:37 PM   #24
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Multiple circuits (separate neutral) in a conduit with receptacles


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When using EMT, you dont need the EGC

Rephrase.
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Old 09-19-2011, 07:42 PM   #25
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Multiple circuits (separate neutral) in a conduit with receptacles


Quote:
Originally Posted by Code05

Rephrase.
250.4(A)(4) Bonding of Electrically Conductive Materials and Other Equipment. Electrically conductive materials that are likely to become energized shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.

*This is a quote from 2005. My 2008 isn't handy at the moment*
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Old 09-19-2011, 08:56 PM   #26
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Multiple circuits (separate neutral) in a conduit with receptacles


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Rephrase.
My turn...

A conduit system of EMT made proper and continuious, with tight couplers and fittings at junction boxes and the like, can be used as the EGC, and no additional EGC conductor needs to be run within the pipe. Device EGC terminals can be connected to the metal box that supports it with a proper jumper.
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Old 09-19-2011, 09:05 PM   #27
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Multiple circuits (separate neutral) in a conduit with receptacles


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My turn...

A conduit system of EMT made proper and continuious, with tight couplers and fittings at junction boxes and the like, can be used as the EGC, and no additional EGC conductor needs to be run within the pipe. Device EGC terminals can be connected to the metal box that supports it with a proper jumper.
Your break down is 20x better than mine, but the conduit dosent have to be EMT
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Old 09-19-2011, 09:10 PM   #28
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Multiple circuits (separate neutral) in a conduit with receptacles


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Your break down is 20x better than mine, but the conduit dosent have to be EMT
No it doesn't have to be EMT. But it can't be something like galvanized or copper water pipe either. It has to be a recognized wiring method conduit, metal, and complete (physically and electrically) to qualify to be an EGC. I only mentioned EMT because that was what was mentioned before.
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Old 09-19-2011, 09:41 PM   #29
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Multiple circuits (separate neutral) in a conduit with receptacles


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Originally Posted by Code05 View Post
Yes one #12 is sufficient.

No, you do not have to install a wire EGC if you do not want to. The EMT can be the EGC, but there are other rules you must follow.

I recommend the wire EGC for a DIY installation.
I will use grounding conductor as you recommend. -- Thanks

@Others, I also understand that EMT can be used as EGC and no additional EGC is required (thanks to you all). But I'm worried that I might not do things right with EMT connectors, etc.
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Old 09-20-2011, 12:58 AM   #30
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Multiple circuits (separate neutral) in a conduit with receptacles


As long you have the EMT connector and set screws tight you are fine with grounding purpose.

Just take a older or other flat screwdriver which it will get damaged over the time and use that with a hammer or a niner { linemans pliers } and give a good whack on it you will have to do that few time to make sure it is good and tight.

And also pay attetion when you cut the EMT make sure you deburr it with rememer

Here the photo of this tool I use all the time it will have dual purpose one to deburr and also drive the set screw in without slipping.



They are about 15 - 25 Euros but it worth it if you doing alot of EMT's that photo show above that will work for half , three quarter and full inch EMT conduits.

I have 4 of them and I used it all the time. { two are standard sized and other two is metric sized due I am in France and we have metric conduits here. }

Merci,
Marc

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