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

Topic Options
Rate This Topic
#57226 - 10/07/05 12:28 PM What makes a good grounding electrode system for Skagway Alaska??
Rich Thomas Offline
Member
Registered: 03/09/05
Posts: 48
Loc: Seattle, Washington, USA
The service will be 208V, 3-phase, 4-wire.
Main service disconnect will be 100 Amp

The service entrance equipment will be located in an outdoor, weatherproof and heated enclosure. The enclosure also encloses a control system for a concrete sewage lift station with a bottom at 18 feet below grade.

One of the main considerations is that the ground freezes during the winter. I've also heard that the permafront is 1800 feet deep in places around Skagway.

Do you have any thoughts the design of a good grounding electrode system be that provides the necessary grounding (earthing) protection year round??

Thanks for your comments, your expert help is much appreciated.
Rich Thomas
Top
Work Gear for Electricians and the Trades
#57227 - 10/07/05 01:06 PM Re: What makes a good grounding electrode system for Skagway Alaska??
dmattox Offline
Member
Registered: 10/20/04
Posts: 265
Loc: Anaheim, CA
I'm not sure how freezing would be a problem for the GES? Though I live and work in sunny SoCal
Top
#57228 - 10/07/05 01:19 PM Re: What makes a good grounding electrode system for Skagway Alaska??
jw electric Offline
Member
Registered: 09/08/05
Posts: 106
Loc: Asheboro, NC
eight foot ground rods?
_________________________
Mike
Top
#57229 - 10/07/05 01:22 PM Re: What makes a good grounding electrode system for Skagway Alaska??
raider1 Offline
Member
Registered: 07/08/05
Posts: 46
Loc: north logan, utah, US
Using a concrete encased electrode would be a good bet.

The requirement for footings to be below frost depth would help out with your concerns.

Chris
Top
#57230 - 10/07/05 04:32 PM Re: What makes a good grounding electrode system for Skagway Alaska??
LK Offline
Member
Registered: 01/21/03
Posts: 1429
Loc: New Jersey
Stop in the chat room one evening after 10pm EST we have a few electricians from that area.
Top
#57231 - 10/08/05 06:12 PM Re: What makes a good grounding electrode system for Skagway Alaska??
gfretwell Online   content


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
It may be too late for this one but a Ufer in the bottom of that collection tank is probably as good as it gets.
_________________________
Greg Fretwell
Top
#57232 - 10/10/05 11:19 AM Re: What makes a good grounding electrode system for Skagway Alaska??
Rich Thomas Offline
Member
Registered: 03/09/05
Posts: 48
Loc: Seattle, Washington, USA
Thanks to all those who responded.

Since posting my question I've found that the ground in Skagway doesn't freeze very deeply, so an industry standard type grounding electrode system is adequate.

However, gfretwell's idea using the wet well rebar as a ufer will be part of the system.

Thanks again,
Rich
Top
#57233 - 10/10/05 11:35 AM Re: What makes a good grounding electrode system for Skagway Alaska??
winnie Offline
Member
Registered: 09/15/03
Posts: 649
Loc: boston, ma
Just to bump dmattox's question, because I'd like to know more.

Quote:

I'm not sure how freezing would be a problem for the GES?


My understanding is that the conductivity of soil/clay/earth depends upon the ionic conduction, where ionized atoms physically _move_, rather than metallic conductivity. If the ground freezes, then the conductivity can drop in much the same way as a GES in soil that becomes very dry. At least that is my weak understanding. I'd love to learn more on this topic.

-Jon
Top
#57234 - 10/13/05 07:28 PM Re: What makes a good grounding electrode system for Skagway Alaska??
distributor x Offline
Member
Registered: 07/28/05
Posts: 57
Loc: Canada
How about Conducrete??
http://www.saeinc.com/Conducrete
Top
#57235 - 10/14/05 05:12 PM Re: What makes a good grounding electrode system for Skagway Alaska??
Rich Thomas Offline
Member
Registered: 03/09/05
Posts: 48
Loc: Seattle, Washington, USA
I'll give Conducrete a looksee. Thanks distributor x.

Rich
Top

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 87 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

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