A bit confused by NEC Code..

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We installed a Computer Rack in a Equipment Room. All the other Racks ( three) had FMC running from J Boxes less than 3 feet overhead to the Rack Twist lock receptacles.
I went out to another site and I came back and the tech had used some liquidtiite-- only because he had 3' of it in his truck.
I was a bit taken aback. Never saw Liquidtite used inside.
It look ugly, but actually Liquidtite is FMC, right? So technically he did the right thing, its just cosmetically bad.
 
LT conduit comes in metallic and non-metallic forms.
which one was used?

i would also check with local AHJ to see if any plastic style conduit is allowed in a "datacenter" that is located inside the "equipment room"..
 
I prefer LT conduit over FMC. To me the LT looks better. And lately I have been using LTNM as is easier to cut, protects the wires as well as LT.
 
petersonra said:
Why would this be? Unless there are local amendments to the code.
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  1. the OP seems to suggest the installation is not residential.
  2. i think some locales just dont like some types of plastics due to the fumes they produce in a fire. if i recall correctly, is why some locales prefer or demand hdpe vs pvc when plastic conduit is used.
 
FionaZuppa said:
  1. the OP seems to suggest the installation is not residential.
  2. i think some locales just dont like some types of plastics due to the fumes they produce in a fire. if i recall correctly, is why some locales prefer or demand hdpe vs pvc when plastic conduit is used.
Click to expand...

I thought HDPE was not allowed inside????
 
FionaZuppa said:
  1. the OP seems to suggest the installation is not residential.
  2. i think some locales just dont like some types of plastics due to the fumes they produce in a fire. if i recall correctly, is why some locales prefer or demand hdpe vs pvc when plastic conduit is used.
Click to expand...

And Bob didn't mention residential.

Unless the area has a formal amendment and the adopted standard is the NEC they can want a lot but, the NEC is what would be enforced.

Roger
 
Installer said:
We installed a Computer Rack in a Equipment Room. All the other Racks ( three) had FMC running from J Boxes less than 3 feet overhead to the Rack Twist lock receptacles.
I went out to another site and I came back and the tech had used some liquidtiite-- only because he had 3' of it in his truck.
I was a bit taken aback. Never saw Liquidtite used inside.
It look ugly, but actually Liquidtite is FMC, right? So technically he did the right thing, its just cosmetically bad.
Click to expand...

How do these transformers look? The specs called for LFMC.

CICUtfrmers.JPG


Roger
 
roger said:
And Bob didn't mention residential.

Unless the area has a formal amendment and the adopted standard is the NEC they can want a lot but, the NEC is what would be enforced.

Roger
Click to expand...

your logic seems a tad, i dunno, odd.
right, "residential" was not mentioned, good observation i guess?
right, unless a local AHJ code supersedes the adopted code (NEC or other), then there wont be any code that supersedes NEC

we know many non-resi areas that AHJ enforces lots of times have stricter rules
and
we know the "unless" part is a question mark in disguise and should not go unchecked, best to find out what the AHJ says
 
FionaZuppa said:
your logic seems a tad, i dunno, odd.
right, "residential" was not mentioned, good observation i guess?
right, unless a local AHJ code supersedes the adopted code (NEC or other), then there wont be any code that supersedes NEC
Click to expand...
Since both of those were right what is odd with my logic?

FionaZuppa said:
we know many non-resi areas that AHJ enforces lots of times have stricter rules
and
we know the "unless" part is a question mark in disguise and should not go unchecked, best to find out what the AHJ says
Click to expand...
As I said before, if there is not a formal amendment I already know what the AHJ says, and that is nothing more than the NEC and other applicable codes.

Now let's go to the inspector, he / she is an enforcer of the adopted codes, he / she does not make up there own rules.

Roger
 
roger said:
Since both of those were right what is odd with my logic?

As I said before, if there is not a formal amendment I already know what the AHJ says, and that is nothing more than the NEC and other applicable codes.

Now let's go to the inspector, he / she is an enforcer of the adopted codes, he / she does not make up there own rules.

Roger
Click to expand...

it was odd only in that you seemed to have written the same thing, just using different words of the same logic.

i didnt say inspector, i said AHJ, the two are not the same.
 
353.12 (2) forbids using HDPE conduit within a building. it is strictly OSP conduit. Don't know or care what the plumbers do or use.

Eta: if you are looking for a logical reason, plumbers PEX piping is full of water and not as likely to catch fire as electrical conduit made from HDPE. if you want a completely illogical reason, because I said so ( and yes, I just pulled the parent to 8 year old kid card). Somewhere in the middle maybe the fact that there are no sweeps or fittings for HDPE conduit that I'm aware of, and if you've ever dealt with 4in diameter HDPE, you'd probably rather run anything else. It's awesome as unbroken runs for directional or line boring, and positively horrible for any other purpose
 
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