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
#104086 - 12/25/02 05:14 PM Wiring Methods in the Sand!
Joe Tedesco Offline
Member

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


These wiring methods were buried in the sand on a beach!



[This message has been edited by Joe Tedesco (edited 02-17-2003).]
_________________________
Joe Tedesco, NEC Consultant

Top
2014 / 2011 NEC & Related Books and Study Guides
#104087 - 01/17/03 10:09 AM Re: Wiring Methods in the Sand!
John Steinke Offline
Member

Registered: 04/03/01
Posts: 509
Loc: Reno,Nv., USA
Remember Carl, who wanted us to explain the "why" as well as the "what?"
Bell boxes, made of zinc, are quite often not resistant to corrosion where they are located. Both salt spray and direct burial seem to lead to their rapidly corroding away.
The lack of burial depth is not as simple an issue as it would first appear. Would you rather the assembly be beneath the water table?
Near the surface as it is, it is subject to both movement (shifting sand) and mechanical damage (tripping). Either can result in the wires (and connections) being damaged.
Where you have movement, it is important that your connections be made in such a way that any strain is not transmitted to the conductor connections. The use of "smurf tube" makes sure that the strain is absorbed only by the connections- just the opposite of what we want.
Lest I open a whole new can of worms, this MIGHT be a place for SO cord, strain relief fittings, and PVC (NEMA-4X) boxes. It all depends upon what the circuit is derving!
We often chide people for using plumbing components for electrical work- yet I am not aware of any listed bronze or stainless conduit. If I were to pipe this, I'd consider using SS plumbing pipe.
I don't like UF, for a number of reasons. I don't think UF is subjected to a salt-spray test; nor do I think that there are NEMA-4 strain relief fittings for any but the smallest sizes. I'd have to research this before I rule UF out.
If that box is there only as a splice, I would suggest that a resin/epoxy spliceing kit would be preferable to a box. A buried box is not accessible, in any event.

Top
#104088 - 02/17/03 06:52 AM Re: Wiring Methods in the Sand!
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Thanks John for your reply. This was an energized circuit that was run to a cabana!
_________________________
Joe Tedesco, NEC Consultant

Top
#104089 - 02/19/03 03:30 PM Re: Wiring Methods in the Sand!
yaktx Offline
Member

Registered: 02/19/03
Posts: 286
Loc: Austin, Texas, USA
"We often chide people for using plumbing components for electrical work- yet I am not aware of any listed bronze or stainless conduit. If I were to pipe this, I'd consider using SS plumbing pipe."

Well, I've seen SS before, in a semiconductor manufacturing plant. I've seen threading dies ruined by people who didn't know they were not for SS. There were condulets that were SS and I think they were chrome plated. I didn't run any of the stuff myself but I remember it had to be laboriously polished before installation (customer rules). I assumed it was Listed but I really don't know for sure.

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