Bundling or Not-MI Cbale

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mstrlucky74

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If you were running 3-1/C #1/0 or larger on strut would you support the 3 conductors under one strut clamp or 3 separate strut clamps at each location? How is it most often done? Thanks.
 
mstrlucky74 said:
If you were running 3-1/C #1/0 or larger on strut would you support the 3 conductors under one strut clamp or 3 separate strut clamps at each location? How is it most often done? Thanks.
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You need a single clamp if the clamps and the strut are made of ferrous metal.
 
See 332.21: You need to group them.

I don't know how severe the effects would be, but by using ferrous steel clamps between phases you would run the risk of inductively heating the strut clamps.
 
I agree with the knowledgeable dudes ahead of me and will only add that don't worry about bundling with 3 current carrying conductors or less.
 
From the nature of your questions it sounds like you've never installed this stuff before.

It might really be in your interest to just read Article 332 so you can be sure you've got the basic requirements of your installation covered.
 
big john said:
From the nature of your questions it sounds like you've never installed this stuff before.

It might really be in your interest to just read Article 332 so you can be sure you've got the basic requirements of your installation covered.
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No I haven't ...will do. Thanks
 
Here is an MI job I took some pictures of some years ago. I had nothing to do with it but it is a good example of running MI.


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My son is trying to get into the electrical shop at Pearl Harbor Shipyards. My question is for the navy dudes, is MI cable pretty common onboard US navy ships? I was telling him he was probably going to be having to run some of it if they pick him up. But as you see, I am uncertain about it. I have done lots of jobs on the base , but never aboard one of the ''boats''.
 
cdslotz said:
Wow...that must have cost a fortune..
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I agree.

It was a large hospital, I was in there doing other electrical work and saw this MI work that was just getting finished up. These cables ran all over the hospital up and down floors and through finished suspended ceilings in a 24/7 facility. It had to be a very tough job to make it happen.
 
iwire said:
I agree.

It was a large hospital, I was in there doing other electrical work and saw this MI work that was just getting finished up. These cables ran all over the hospital up and down floors and through finished suspended ceilings in a 24/7 facility. It had to be a very tough job to make it happen.
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I hope the contractor was on top of his game for that install. We can see this is fairly exotic stuff, and if it doesn't get bid right, based on how extensive you say it is, it could easily tank a company.
 
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