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!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
1 registered (HotLine1), 58 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#180811 - 09/11/08 01:11 PM Service Entrance Grounding
thiggy Offline

Registered: 05/12/04
Posts: 25
Loc: B'ham Al
While examining my mother's fuse panel, I started wondering about the grounding system. Her house was built about 1960, and has a 100 amp fuse box on the inside basement wall, with a 100 amp cartridge fuse disconnect outside beside the meter. I noticed that the outside box has a bare ground wire which runs in to the fuse box, then up to the cold water copper tubing which runs above the fuse box. There is no ground rod driven into the soil. Is this an appropriate method of grounding the service panel? I wonder about the continuity of the copper plumbing, particularly where there is a pressure regulator in the line. Should this go to a ground rod in the soil rather than being clamped to the water system?

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#180812 - 09/11/08 01:30 PM Re: Service Entrance Grounding [Re: thiggy]
gfretwell Offline


Registered: 07/20/04
Posts: 9026
Loc: Estero,Fl,usa
Back when all water distribution was metal that was the best grounding electrode. The whole city was tied to the same equipotential grid. Now that everything is plastic that is no longer true so we have the requirement for the supplemental electrode. I would drive a rod and connect it to the panel. If there is any question about the conductivty of the pressure regulator (not all metal body) jumper around it.
Greg Fretwell


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