why is romex dangerous in a 4 story or greater building?

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  #1  
Old 11-06-02, 08:40 PM
M
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why is romex dangerous in a 4 story or greater building?

I'm a pipe and wire Electrician with no experience at all with romex so I need some info.

At coffee today we were discussing why romex would be allowed in a 3 story Apartment building Per 1999 NEC but became Dangerous to use <not permitted per 1999 NEC therefore must be dangerous> in a 4 story apartment building. Any comments??


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Old 11-07-02, 08:31 AM
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Just a guess, but I'd say the answer has to do with the risk level of fire. The taller the building, the more the danger of fire. As buildings get taller, codes get more restrictive.

There's no magical difference between 3 and 4 floors. They just had to put the cutoff somewhere. NEC codes are based on post-mortem investigation of tragedies, testing, and judgement.
 
  #3  
Old 11-07-02, 04:49 PM
W
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COPIED SECTION OF NEC 1999
336-5. Uses Not Permitted
(a) Types NM, NMC, and NMS. Types NM, NMC, and NMS cables shall not be used in the following:
1. In any multifamily dwelling or other structure exceeding three floors above grade

PERSONAL COMMENT;
Notice IN 336-5-A-1 in any multifamily dwelling or other strucutre exceeding three floors above grade NM cable is forbidden. NOW READ ON FOR A MAJOR CHANGE IN THE 2002 NEC.

COPIED SECTION OF NEC 2002

334.12 Uses Not Permitted.
(A) Types NM, NMC, and NMS. Types NM, NMC, and NMS cables shall not be used as follows:
(1) As open runs in dropped or suspended ceilings in other than one- and two-family and multifamily dwellings.


PERSONAL COMMENT;
Notice that in the 2002 the rule forbidding NM cable in multifamily dwelling or other structures exceeding three floors HAS BEEN DELETED. As of the 2002 NEC the limit of number of floors high has been withdrawn and there is no longer any maximum number of floor limt that forbids NM cable.

The three floor limit no longe exists in the 2002 NEC.

Hope this helps

Wg
 
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