ECN Forum Forums Code Related Discussion NEC & other Code issues Seal Offs

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%.

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...

Seals are usually upsized via EXP redcuers to meet the fill, but i have never heard of a 7" or 8" seal.

What is the flammable fuel involved in this installation?
Don(resqcapt19)

natural gas

class 1 div 2

gas turbines

Is this a new installation or old work?

GJ

new installation at power house

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

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