310.4 and the powers that be.

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Dennis Alwon said:
I still say not necessary to be exact.
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I must have missed that in the rules. :D

So it's the as 'same' as you choose it to be? :D

For me it's the 'same' as I can make it in all respects.

How many parallel conduits have you run?

For me it is pretty common and usually the number of couplings, straps and connectors will be the same, you almost have to try to do otherwise and then it will look 'hack'.
 
Jim W in Tampa said:
I dont recall mike careing about my languge when he took my check for his course.
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Well send me a check and I'll see what I can do. (Just kidding):grin:

The other problem was where you were symbolically cussing an engineer in your first post and there was no mention of an engineer in the OP. An indicator of PWI maybe?

Roger
 
I think set screw couplings are cast metal. Where most compression ones are forged. Or other wise made as not to be cast metals.
Some set screw couplings will break if you tighten them to much.
 
iwire said:
I must have missed that in the rules. :D

So it's the as 'same' as you choose it to be? :D

For me it's the 'same' as I can make it in all respects.

How many parallel conduits have you run?

For me it is pretty common and usually the number of couplings, straps and connectors will be the same, you almost have to try to do otherwise and then it will look 'hack'.
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It is an existing install. Does he have to match the same brand connectors etc. I would be surprised if it made a difference but you are right I probably have no right posting here-- I do resi and this is outta my league-- I have never done a parallel feed once , I believe, about 30 years ago. :)
 
chris kennedy said:
So your saying I'm cool with set-screw.
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Well I have no idea of what Jim thinks but, IMO you are.

Roger
 
buckofdurham said:
I think set screw couplings are cast metal. Where most compression ones are forged. Or other wise made as not to be cast metals.
Some set screw couplings will break if you tighten them to much.
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We use steel set screw fittings on a regular basis.

Roger
 
I think you have a valid point from a business perspective regarding a change order if you have to change the connector type.

Not sure if 310.4 changed from 05 to 08, but according to 05 "...Where run in separate raceways or cables, the raceways or cables shall have the same physical characteristics." Where I come from a coupling is used to join two pieces of raceway together. The coupling isn't part of the raceway itself, it's just necessary to use them to have a legal raceway installation that is longer than one piece of pipe. I would say the same of the type of straps used to support the raceway.

I do agree with the physics-based arguments though, but then there's that saying that somebody has in their signature about the NEC not recognizing the laws of physics or something like that.
 
buckofdurham said:
I think set screw couplings are cast metal. Where most compression ones are forged. Or other wise made as not to be cast metals.
Some set screw couplings will break if you tighten them to much.
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either one is good enough to be your ground.But then nec says nothing about how many couplings we can have either or how long the run can be.
 
Dennis Alwon said:
It is an existing install. Does he have to match the same brand connectors etc.
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LOL I will plead the 5th. :grin:

I will say this, IMO it will be very difficult to add two conduits to the existing four and meet all the NEC requirements.
 
chris kennedy said:
I started an install today that requires adding two more 2" EMT runs to an existing rack of four. Each EMT contains or will contain three 3/0 and the EMT is the EGC.

These are/will be parallel conductors.

The the project PM looks up at the first 150' run and says I can't use set screw fittings, he just got a pdf spec requiring compression.(after contract is signed???)

I tell him I have to match existing as per this:


So if I have 4 raceways existing with set screw fittings and add 2 with compression fitting, do my raceways have the same characteristics???
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When i see specs i think are crazy i call my PM and let him make the call.I am one of them guys that takes or finds a half hour to read spec sheets.Often told forget them but i cover my, oops i cant say it or i break the rules.
 
iwire said:
LOL I will plead the 5th. :grin:

I will say this, IMO it will be very difficult to add two conduits to the existing four and meet all the NEC requirements.
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Pictures tomorrow. This is a pretty interesting install.
 
Dennis Alwon said:
This thread may not last that long..:)
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I think we'll make it, it appears to be back on track. :D

Roger
 
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