Fittings in a class 1 div 2 area

H

Hoggfann1971

Member
Location
Detroit Mi
Occupation
25 year field electrician / Instructor
So Forum Team... i have one for ya. I need to clarify something..... do all fittings in a class 1 div 2 area have to be explosion proof? I have EP enclosures with a seal off local to the device and i also have seal entering and leaving the classified location. the question is.... do all fitting associated with the conduit system in the area have to be EP? I am having to use a lot of transition fittings "T"'s LR LL etc. to get to the device.

PS this is for Access Points in a C1D2 Location... Cat 6a Cabling... Seal off at 12" from each device and entering and leaving the zone...Sealoff.

I look forward to some intel on this ASAP
 
Don't have my code book with me right now but my understanding is in class 1 div 2 fittings only need to be explosion proof when required by the code. For example coming out of an explosion proof device/instrument to your required seal-off everything up to the seal-off needs to be explosion proof but after the seal-off it does not.

Another good source of information is the Eaton/Crouse-Hinds 2023 Code Digest 500-516. It is free and easy to find on the internet.
 
The way I look at is: If it is in a CID2 area, the fittings need to be CID2. Condulets with gasketed covers are rated for CID2. Sealing is only required when the raceway or cable leaves the classified area, which includes devices that require sealing to maintain their classification. This is usually stated as CID1, such as transmitters and actuators. So you need seals where the raceway or cable enters the device.
 
No.

501.10(B)(4) Boxes and Fittings. Boxes and fittings shall not be
required to be explosionproof except as required by
501.105(B)(2),501.115(B)(1),and501.150(B)(1).
 
TwoBlocked said:
The way I look at is: If it is in a CID2 area, the fittings need to be CID2. Condulets with gasketed covers are rated for CID2. Sealing is only required when the raceway or cable leaves the classified area, which includes devices that require sealing to maintain their classification. This is usually stated as CID1, such as transmitters and actuators. So you need seals where the raceway or cable enters the device.
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I can install 4" square boxes in Class I, Division 2 areas. There is no requirement for anything other than what is required by the area environment, for example a wet location.
 
Essentially, in Division 2, begin with, “How would I design this if it weren't Classified?” Then look for equipment that in “normal” (not necessarily “common”) operation that creates arcing, sparking, and/or high temperature (ASH) conditions; I.e., those described in Sections 501.105(B)(2), 501.115(B)(1), and 501.150(B)(1). Deal with them as instructed.
 
TwoBlocked said:
I'll have to look through the references. If what you guys say is the final word, why would form 7 condulets be rated CID2, if there was no such thing as conduit fitting being rated CID2?

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Marketing...just like the "requirements" that are in the hazardous area installation guide published by Appleton and Crouse-Hinds. (I believe both are owned by Eaton now)
 
TwoBlocked said:
I'll have to look through the references. If what you guys say is the final word, why would form 7 condulets be rated CID2, if there was no such thing as conduit fitting being rated CID2?

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It's been a few years since I wired equipment in C1 Div2 locations, but in that guide it's the first time I've seen a requirement for the iron condulet to be removable by cracking the condulet open with a hammer.
 
don_resqcapt19 said:
What in the code would require the fitting or box to be rated for installation in a Class I, Division 2 location? Look at the language in 501.10(A)(3) verses that in 501.10(B)(4). (B)(4) has no requirements other than where the box contains arcing contacts.
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Not sure, still looking... but your references are talking about cabling, not equipment like fittings.
 
TwoBlocked said:
Not sure, still looking... but your references are talking about cabling, not equipment like fittings.
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501.10(A)
(3) Boxes and Fittings.
All boxes and fittings shall be identified for Class I, Division 1.

501.10(B)
(4) Boxes and Fittings.
Boxes and fittings shall be explosionproof if required by 501.105(B)(2), 501.115(B)(1), or 501.150(B)(1).
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