Transition from EMT to Romex

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TOOL_5150

TOOL_5150

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bay area, ca
Hey I have a 100A feed in an EMT pipe that will be going to a junction box. There is no EGC pulled, Just 2 un grounded and grounded conductor [#2's] They will terminate in the j-box, then I am going to transition to 2/3 romex wich will then drop down into the new panel. As far as keeping the ground to code, do I need to use a bonding bushing in the j-box and tie that to the romex ground which lands in the panel?

For some reason, I think there is more to it than that but I have been in their attic too long today.

Thanks guys,

~Matt
 
They don't make 2/3 romex, so you're probably going to use SER instead. You can use a bond bushing if you want to, but it's cheaper to just bolt a mechanical lug to the back of the box. Otherwise, your plan is okay.
 
mdshunk said:
They don't make 2/3 romex, so you're probably going to use SER instead. You can use a bond bushing if you want to, but it's cheaper to just bolt a mechanical lug to the back of the box. Otherwise, your plan is okay.
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Ahh yeah, I knew there was an easier answer. But I strongly disagree with you that they do not make a 2/3 romex.

~Matt
 
TOOL_5150 said:
Ahh yeah, I knew there was an easier answer. But I strongly disagree with you that they do not make a 2/3 romex.

~Matt
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Hmmm... I see that now that I look at Southwire's site. I always thought #4 was the cutoff. Do they carry that at your supply house?
 
mdshunk said:
Hmmm... I see that now that I look at Southwire's site. I always thought #4 was the cutoff. Do they carry that at your supply house?
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They have it at the big orange. I was in there getting the standard stuff before I went to the supply house and figured I would just get it then. Its over $6 a foot!

~Matt
 
TOOL_5150 said:
Hey I have a 100A feed in an EMT pipe that will be going to a junction box. There is no EGC pulled, Just 2 un grounded and grounded conductor [#2's] They will terminate in the j-box, then I am going to transition to 2/3 romex wich will then drop down into the new panel. As far as keeping the ground to code, do I need to use a bonding bushing in the j-box and tie that to the romex ground which lands in the panel?

For some reason, I think there is more to it than that but I have been in their attic too long today.

Thanks guys,

~Matt
Click to expand...

Just put a lug in the jb for the EGC from the romex.

My suppliers stock 2/3nm with ground also.
 
peter d said:
I have never seen or installed 2/3 Romex...always aluminum SER cable.
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When the conductors get that big, I start to think about aluminum. Even if I knew about 2/3 romex, which I didn't, I would probably tend to use SER anyhow.
 
Dennis Alwon said:
Read art. 334.104
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I didn't say it doesn't exist...just that nobody uses it in my area. In fact, the vast majority of feeders in many buildings here are aluminum SER cable. It is very hard to justify 3X-4X or higher for the cost of a copper feeder, especially in residential work.
 
peter d said:
I didn't say it doesn't exist...just that nobody uses it in my area. In fact, the vast majority of feeders in many buildings here are aluminum SER cable. It is very hard to justify 3X-4X or higher for the cost of a copper feeder, especially in residential work.
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And I didn't say you didn't believe it exists. :) Just thought you might have found it interesting that there is a limit to the size for romex. I was surprised. There does not seem to be a limit on se cable. Uf is limited to 4/0 copper-- wow what would that cost.....
 
Unless this is a main feeder, keep in mind that #2 al is not going to be rated for 100a (unless the entire train is rated for 90? use.)
 
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