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#104245 - 01/19/03 07:10 AM Expansion "Joints" and Extensions for a Box?  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
[Linked Image]

Rules in Article 300 and 314 can be discussed here. Which ones are they?


Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#104246 - 01/19/03 11:21 AM Re: Expansion "Joints" and Extensions for a Box?  
Gwz  Offline
Member
Joined: Apr 2002
Posts: 197
Assuming the lower opened box is for the viewing of the wiring for the picture and the flex contains an EGC , I do not see a violation.
See 314.22.

Since the Flex is for flexibility in this installation, It must have an EGC , 350.60.

An extension box could have been added to all of the flush mounted boxes and the LFMC could have connected to a KO in the side of the extension box(es), then the cover would have been ' just a cover'.

Looks like it could be a 'damp' location.


#104247 - 01/19/03 02:21 PM Re: Expansion "Joints" and Extensions for a Box?  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Now I've seen it all...a double-wide trailer house with concrete floor joists! ;-)


#104248 - 01/19/03 03:05 PM Re: Expansion "Joints" and Extensions for a Box?  
spyder  Offline
Member
Joined: Oct 2002
Posts: 210
Massachusetts
What is the location or this installatiion? What exactly is being wired here? I mainly do residential work and have never come across anything like this.


#104249 - 01/19/03 05:47 PM Re: Expansion "Joints" and Extensions for a Box?  
JCooper  Offline
Member
Joined: Dec 2002
Posts: 228
Kendall Park, NJ USA
It looks like its fire alarm wiring, due to the FA written on the top of the cover. I am not sure if it is a local code or not but we had to spray paint all the box covers red for fire alarm work


#104250 - 01/19/03 06:35 PM Re: Expansion "Joints" and Extensions for a Box?  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Looks like a parking structure to me.

I would put money on water filling each of the LFMCs

Interesting use of Dry location covers with LFMC.

Looks shorter then 36", so no support 350.30 (A) Exc 2

The covers look like standard 4" round blanks which have a keyhole slot and a straight slot.

I think that is a violation of 314.22 Exception

"cover is designed so it is unlikely to fall off or be removed if it becomes loose"


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#104251 - 01/19/03 06:40 PM Re: Expansion "Joints" and Extensions for a Box?  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
I thought so too, because of the FA marked on the box.

This was taken at the Dallas Airport parking deck at street level, and I agree that it can be considered as a Damp Location.

I was looking for the rule that poined out that the attachment screws should not allow the cover to fall off as shown.

I did not remove the cover. I was also looking for the 3 inch rule beyond the edge of the ring to be considered whenever an extension ring is installed per 300.14.

I too agree that the best way to avoid a problem is to come out of the side of the extension box.


Joe Tedesco, NEC Consultant

#104252 - 01/21/03 12:35 PM Re: Expansion "Joints" and Extensions for a Box?  
SvenNYC  Offline
Member
Joined: Aug 2002
Posts: 1,691
New York City
In my opinion, if this is a fire alarm circuit, painting the entire assembly (conduit and boxes) a bright red, like JCooper said, is much more effective than simply marking the box covers "FA."

The painters that will someday work on this ceiling (this is a ceiling, right?) will probably not even try to avoid painting over those box covers thereby covering up the "FA."


#104253 - 01/21/03 03:38 PM Re: Expansion "Joints" and Extensions for a Box?  
JCooper  Offline
Member
Joined: Dec 2002
Posts: 228
Kendall Park, NJ USA
Other technicians in my company have been failed because they did not have red covers on the boxs, it also makes the service guy's life a bit easier because all FA splice boxes are rather easy to find. And the red covers keep those pesky electricians from snagging them.....



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