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
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 8
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 236 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#26099 - 05/29/03 08:52 PM multiple services
arseegee Offline

Registered: 01/28/02
Posts: 321
Loc: Statesboro, GA USA
Sorry i havent been around much, these 14 hour days are killing me, but i guess it beats the alternative. Anyway, here's my question.

I am doing a small shopping center that will have five seperate UG services (three 200A 3ph, one 400A 3ph and one 200A 1ph). The poco would not allow me to set each service at the back of the stores due a detention pond that runs behind half of the building. So i have to pipe to the xfmr pad and and set the cans in a bank.

With all these services having less than a foot between them, how should i handle my driven rod? Drive one per service even though the rods would be about 40" apart, or drive two rods or more and form a grid keeping them 6' apart and thermo-weld them together.

I dunno, never had to group my meters so close before.

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....

#26100 - 05/29/03 10:24 PM Re: multiple services
caselec Offline

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA

Your going to supply this building with 5 sets of underground service conductors? If so I feel this would be a violation of 230.2 and also surprised your POCO is willing to do this. You should bring one set of service conductors to the building and then tap off for each meter.

You do not need to drive a separate ground rod for each service. You are required to connect each of these services to the same grounding electrodes. 250.58

Why don't you use a 3 section switchboard? Pull Section - 400A Meter Section - 4 200A Meters Section


[This message has been edited by caselec (edited 05-30-2003).]
Curt Swartz

#26101 - 05/30/03 06:17 PM Re: multiple services
arseegee Offline

Registered: 01/28/02
Posts: 321
Loc: Statesboro, GA USA
Curt, this is a multiple occupancy building with 2hr firewall seperations between the buildings. I wanted to install a trough and tap the services individually but the POCO engineer is requiring me to pipe each lateral to the xfmr. There is no winning an arguement around here with the engineering office at the POCO. Trust me i have tried. Thanks for your info.

#26102 - 05/31/03 08:19 PM Re: multiple services
Scott35 Offline

Broom Pusher and

Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
One Electrode system of sufficient size per the largest service entrance conductor should be fine.
Bond each service section to this electrode system via an appropriately sized grounding electrode conductor - according to the size of the service feeder going to that section's KWH meter clip.

How does this sound to everyone??? Should I elaborate more???

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#26103 - 06/01/03 10:38 AM Re: multiple services
arseegee Offline

Registered: 01/28/02
Posts: 321
Loc: Statesboro, GA USA
Thanks Scott.

#26104 - 06/01/03 12:00 PM Re: multiple services
Bjarney Offline

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
arseegee — One reason for individual utility service laterals is to limit fault current at the service entrance.

[There may be supporting discussion in one of the 1980’s NEC preprints about it.]


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