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Hazardous Location & MC-HL cable #81931
10/02/02 06:40 AM
10/02/02 06:40 AM
R
Redsy  Offline OP
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
When passing from an unclassified location into a Class1 Division1 location, conduit seals must be installed within 10' of the wall separating the 2 areas. See 501.5 (A)(4)

What about MC-HL cable?
501.5(D) addresses cable seals, but does not address seals at Classified/Unclassified boundaries. Should 10' be assumed? I believe the 10' limit is due to the fact that conduit comes in 10' lengths, and since no fittings are permitted between the barrier (wall) and the seal anything over 10' would necessitate a coupling or union. MC-HL cable however, is available, unbroken, as long as needed. Would a cabinet located in an unclassified location need to be close enough to the wall to have a maximum of 10' MC-HL, (which would then be terminated in a MC-HL sealing connector at the cabinet)?

BTW, the '02 Handbook is useful for this discussion.

[This message has been edited by Redsy (edited 10-04-2002).]

2017 / 2014 NEC & Related Books and Study Guides
Re: Hazardous Location & MC-HL cable #81932
10/04/02 07:10 PM
10/04/02 07:10 PM
R
Redsy  Offline OP
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Don't tell me I won this round of "Stump The Electrician" [Linked Image]

Re: Hazardous Location & MC-HL cable #81933
10/04/02 07:38 PM
10/04/02 07:38 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Redsy,
Cables only require seals at termination points that are within the classified area. There is no requirement for a boundry seal.
Don


Don(resqcapt19)
Re: Hazardous Location & MC-HL cable #81934
10/04/02 08:09 PM
10/04/02 08:09 PM
R
Redsy  Offline OP
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Thanks, Don.

I hoped my little goading would prompt a response. [Linked Image]


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