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

Register Now!

Register Now!

We want your input!

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Safety at heights?
by HotLine1
Yesterday at 08:51 PM
International Wire Colour Codes
by Texas_Ranger
Yesterday at 03:29 PM
Looking for older post
by Texas_Ranger
Yesterday at 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
Unsafe Situations
by Trumpy
01/20/17 09:46 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 35
HotLine1 20
Ruben Rocha 17
gfretwell 16
Trumpy 15
Who's Online
0 registered (), 74 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#98682 - 10/29/04 11:17 AM 05 equipotential bond.
cpal Offline
Member

Registered: 05/17/04
Posts: 165
Loc: Cohasset MA
Here is a question. I will be very interested to read the responses.

680.26 (A) and (B) establish the criteria for the equipotential bond.

If a fiberglass in ground pool were installed how would you view the application of 680.26 (C) (3). ??

For that matter how about the bonding grid under a pool deck without mesh.

The proposal only required such a grid for pools constructed of conductive materials. The 2005 wording appears to have broadened the application to apply to all pools.

Charlie Palmieri


[This message has been edited by cpal (edited 10-29-2004).]

Top
2017 / 2014 NEC & Related Books and Study Guides
#98683 - 01/29/05 02:14 PM Re: 05 equipotential bond.
shortcircuit Offline
Member

Registered: 06/27/04
Posts: 608
Loc: massachusetts
cpal...I would interpet 680.26(C)(3) as follows,

When a "permanently installed" swimming pool is installed a equipotential bonding grid shall be established and it shall extend 3 feet horizontally from the water.

Connect this grid to the parts specified in 680.26(B)...which is basicly all other metalic parts and equipment associated with the pool.

Even with a fiberglass inground pool a grid must be installed.

So, I also would have to establish a bonding grid around a permanently installed pool which is above ground and surrounded with a grass lawn border.

Hopefully somebody comes out with an easier way to construct such a grid than 680.26(C)(3)b.

The purpose is to pick up any stray voltage that may be present.

Also, I'm not sure if the "mesh" commonly installed in a concrete deck pour is an acceptable method of establishing a grid...680.26(C)(1)describes reinforcing rods bonded together.?

shortcircuit

Top
#98684 - 01/29/05 02:48 PM Re: 05 equipotential bond.
cpal Offline
Member

Registered: 05/17/04
Posts: 165
Loc: Cohasset MA
I agree . the question was submitted such a long time ago I forgot about it.

I would like to see more discussion regarding the 3' under the deck, and I would like to see an offical statement from the CMP regarding fiberglass pools.

The above ground pool was not considered but yes, this to may be a problem.

Charlie

Top
#98685 - 01/29/05 07:24 PM Re: 05 equipotential bond.
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
We seldom see any steel in a pool deck these days, everyone uses fibermesh in the concrete. The new rule saying you don't have to bond epoxy encased rebar in the shell has left us with no real way to create that equipotential plane.
Should we try to propose a copper ring around the pool, buried in the concrete or just try to get some bare rebar?
_________________________
Greg Fretwell

Top
#98686 - 01/29/05 07:35 PM Re: 05 equipotential bond.
cpal Offline
Member

Registered: 05/17/04
Posts: 165
Loc: Cohasset MA
If the pool does not have structural steel (metal) 680.26 (C) appears to require a manufactured grid. If the rebar is epoxyed 680.26 (B) (1) last sentence requries altenative means. Does (C) (3) provide the alternative means and does that means apply to fiberglass pools. And as mentioned what about above ground pools??

Charlie

Top
#98687 - 01/29/05 10:12 PM Re: 05 equipotential bond.
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
If they are telling the installer they need a 12" x 12" #8 copper grid with a clamp at every intersection they are doubling the price of the shell. Essentually they are outlawing epoxy encased rebar.
Actualy I have never seen it in a pool but these are only half million to 1m houses ;-)
_________________________
Greg Fretwell

Top
#98688 - 02/02/05 03:55 AM Re: 05 equipotential bond.
shortcircuit Offline
Member

Registered: 06/27/04
Posts: 608
Loc: massachusetts
cpal...what does the last sentance of 680.26(C)(3)b mean...with tolerance of 100mm(4")

Also 680.26(C) says the bonding grid shall extend under "paved walking surfaces"...so it may not be required under other surfaces surronding a pool such as a grass lawn border typically seen around above ground permanently installed swimming pools.

shortcircuit

Top
#98689 - 02/02/05 05:12 AM Re: 05 equipotential bond.
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Quote:
what does the last sentance of 680.26(C)(3)b mean...with tolerance of 100mm(4")

It means that you can use a 16" grid in place of the 12" one.
Don
_________________________
Don(resqcapt19)

Top
#98690 - 02/03/05 11:01 PM Re: 05 equipotential bond.
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
It sure sounds like this #8 copper grid will even have to be under a brick paver pool deck, 3' from the water.
Steel mesh will just be orange sand in a few years so it would have to be copper.
_________________________
Greg Fretwell

Top
#98691 - 02/05/05 05:49 PM Re: 05 equipotential bond.
shortcircuit Offline
Member

Registered: 06/27/04
Posts: 608
Loc: massachusetts
Take note that the provisions of 680.26(C) apply to spas and hot tubs installed outdoors also

shortcircuit

Top
Page 1 of 3 1 2 3 >


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