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Seal Offs #77278
05/19/01 08:27 AM
05/19/01 08:27 AM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
given a 6" rigid conduit that contains 3 1550 mcm and a 4/0 ground, which has a STANDARD seal located immediately where the conduit stubs up out of concrete, then the conduit terminates at a large pull box.

i feel that this is a violation because the conduit is allowed 40% fill, but the seal is restricted to 25%.

2017 / 2014 NEC & Related Books and Study Guides
Re: Seal Offs #77279
05/19/01 09:32 AM
05/19/01 09:32 AM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I'm not going to do the math, I'll trust you.

You're correct that it is a violation to exceed the 25% fill unless the seal off is listed for more fill.

6" seal? Bet that was expensive.

Another thing I notice about seals is that a lot of guys like to use fiberglass insulation for the packing instead of the listed fiber made by the manufacturer of the fitting.

Tom


Few things are harder to put up with than the annoyance of a good example.
Re: Seal Offs #77280
05/19/01 09:43 AM
05/19/01 09:43 AM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
Quote
Originally posted by Tom:
I'm not going to do the math, I'll trust you.

You're correct that it is a violation to exceed the 25% fill unless the seal off is listed for more fill.

6" seal? Bet that was expensive.

Another thing I notice about seals is that a lot of guys like to use fiberglass insulation for the packing instead of the listed fiber made by the manufacturer of the fitting.

Tom



thank you tom,

i have 8 gas turbines with generators that have this problem. what do you suggest would be the fix if the cables are installed?

can the code be disregarded? i beleive the intent of the code here is to acheive a proper seal...

i say that one violatation is as serious as another and that the situation should be brought into compliance...

this is a dc circuit that will carry a substantial current...

i want it fixed but it will be expensive...

Re: Seal Offs #77281
05/19/01 04:13 PM
05/19/01 04:13 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
Seals are usually upsized via EXP redcuers to meet the fill, but i have never heard of a 7" or 8" seal.

Re: Seal Offs #77282
05/19/01 05:21 PM
05/19/01 05:21 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
What is the flammable fuel involved in this installation?
Don(resqcapt19)


Don(resqcapt19)
Re: Seal Offs #77283
05/19/01 06:21 PM
05/19/01 06:21 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
Quote
Originally posted by resqcapt19:
What is the flammable fuel involved in this installation?
Don(resqcapt19)


natural gas

class 1 div 2

gas turbines

Re: Seal Offs #77284
05/19/01 07:09 PM
05/19/01 07:09 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Is this a new installation or old work?

GJ

Re: Seal Offs #77285
05/19/01 08:38 PM
05/19/01 08:38 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
Quote
Originally posted by golf junkie:
Is this a new installation or old work?

GJ


new installation at power house

Re: Seal Offs #77286
05/19/01 09:05 PM
05/19/01 09:05 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Then the contractor is responsible for the correction......unless it is in compliance with the engineering spec., in which case the engineer should pay.

GJ

Re: Seal Offs #77287
05/19/01 09:19 PM
05/19/01 09:19 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
What are you using as a basis for calling this a hazardous location? Is there some building code that is calling this a hazrdous location? Just because there is natural gas piping involved doesn't make this an explosion hazard, if it did, any house with a natural gas water heater would have hazardous locations.

I'm certainly not faulting your concerns about safety with the above questions, but I just can't see why sealing is required.

Tom


Few things are harder to put up with than the annoyance of a good example.
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