The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Topic Options
Rate This Topic
#104245 - 01/19/03 03:10 AM Expansion "Joints" and Extensions for a Box?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA


Rules in Article 300 and 314 can be discussed here. Which ones are they?
_________________________
Joe Tedesco, NEC Consultant

Top
2014 / 2011 NEC & Related Books and Study Guides
#104246 - 01/19/03 07:21 AM Re: Expansion "Joints" and Extensions for a Box?
Gwz Offline
Member

Registered: 04/29/02
Posts: 199
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.

Top
#104247 - 01/19/03 10:21 AM Re: Expansion "Joints" and Extensions for a Box?
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Now I've seen it all...a double-wide trailer house with concrete floor joists! ;-)

Top
#104248 - 01/19/03 11:05 AM Re: Expansion "Joints" and Extensions for a Box?
spyder Offline
Member

Registered: 10/14/02
Posts: 211
Loc: 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.

Top
#104249 - 01/19/03 01:47 PM Re: Expansion "Joints" and Extensions for a Box?
JCooper Offline
Member

Registered: 12/30/02
Posts: 229
Loc: 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

Top
#104250 - 01/19/03 02:35 PM Re: Expansion "Joints" and Extensions for a Box?
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: 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

Top
#104251 - 01/19/03 02:40 PM Re: Expansion "Joints" and Extensions for a Box?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: 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

Top
#104252 - 01/21/03 08:35 AM Re: Expansion "Joints" and Extensions for a Box?
SvenNYC Offline
Member

Registered: 08/19/02
Posts: 1685
Loc: 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."

Top
#104253 - 01/21/03 11:38 AM Re: Expansion "Joints" and Extensions for a Box?
JCooper Offline
Member

Registered: 12/30/02
Posts: 229
Loc: 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.....

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals