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#77278 - 05/19/01 05:27 AM Seal Offs
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: 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%.

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#77279 - 05/19/01 06:32 AM Re: Seal Offs
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: 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.

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#77280 - 05/19/01 06:43 AM Re: Seal Offs
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: 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...

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#77281 - 05/19/01 01:13 PM Re: Seal Offs
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Seals are usually upsized via EXP redcuers to meet the fill, but i have never heard of a 7" or 8" seal.

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#77282 - 05/19/01 02:21 PM Re: Seal Offs
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
What is the flammable fuel involved in this installation?
Don(resqcapt19)
_________________________
Don(resqcapt19)

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#77283 - 05/19/01 03:21 PM Re: Seal Offs
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: 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

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#77284 - 05/19/01 04:09 PM Re: Seal Offs
golf junkie Offline
Member

Registered: 04/22/01
Posts: 511
Loc: York, NE
Is this a new installation or old work?

GJ

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#77285 - 05/19/01 05:38 PM Re: Seal Offs
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: louisville, ky usa
 Quote:
Originally posted by golf junkie:
Is this a new installation or old work?

GJ


new installation at power house

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#77286 - 05/19/01 06:05 PM Re: Seal Offs
golf junkie Offline
Member

Registered: 04/22/01
Posts: 511
Loc: 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

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#77287 - 05/19/01 06:19 PM Re: Seal Offs
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: 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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