Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-05-2012, 02:53 PM   #1
Member
 
Join Date: Jan 2012
Location: Arizona
Posts: 35
Rewards Points: 25
Default

Upgraded loadcenter wiring questions


I'm upgrading my externally-mounted (NEMA 3R) loadcenter and have a couple questions regarding wire ratings. My meter box is separate from my loadcenter. In my area NEC 2008 rules are now followed (house was built about 30 yrs ago).

1) Existing service wire from meter to loadcenter is rated THW 600V. I want to replace with new THHN 600V. NEC 2008 Table 310.13(A) says THW can be used in "dry and wet" locations whereas THHN can be used in "dry and damp" locations. Is my application considered "wet" and thus THHN is not allowed? I need this clarification.

2) Existing ground wire is #4 CU stranded bare. I need to replace it so I'd like to use #4 CU solid bare. Is there any problem using solid?

3) Existing grounding electrode is a "concrete encased" house foundation type. I want to continue to use this as the *only* grounding electrode along with proper bonding to the loadcenter. My interpretation of NEC 2008 implies I don't need to add another (if I did I'd use a ground rod since any other suitable grounding system is not convenient to make connection to).

Thanks for your expert help.

Johnd85053 is offline   Reply With Quote
Old 02-05-2012, 03:00 PM   #2
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,698
Rewards Points: 2,194
Default

Upgraded loadcenter wiring questions


Exterior locations are considered wet, even if in conduit.

The Ufer does not need to be supplemented with another electrode.

The ground can be solid or stranded.

__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is offline   Reply With Quote
Old 02-05-2012, 03:01 PM   #3
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,860
Rewards Points: 2,116
Default

Upgraded loadcenter wiring questions


1-Most thhn wire is dual rated as thwn, and if it is outside, it is considered a wet location.

2-No problem with the solid wire.

3-Fine the way it is.
__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is offline   Reply With Quote
Old 02-05-2012, 03:06 PM   #4
Member
 
Julius793's Avatar
 
Join Date: Dec 2011
Location: New york
Posts: 1,053
Rewards Points: 500
Default

Upgraded loadcenter wiring questions


Quote:
Originally Posted by Jim Port
Exterior locations are considered wet, even if in conduit.

The Ufer does not need to be supplemented with another electrode.

The ground can be solid or stranded.
I've never can across #4 solid wire do you see it often?
__________________
Electricity will kill you if you give it a chance
Julius793 is offline   Reply With Quote
Old 02-05-2012, 03:14 PM   #5
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,698
Rewards Points: 2,194
Default

Upgraded loadcenter wiring questions


The supply houses carry it. Never had a problem finding it.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is offline   Reply With Quote
Old 02-05-2012, 03:14 PM   #6
Member
 
Join Date: Jan 2012
Location: Arizona
Posts: 35
Rewards Points: 25
Default

Upgraded loadcenter wiring questions


So the markings on the THHN that I want to use has only "THHN" on it, not "THHN / THWN", for example. For dual rating, so I can use it in this "wet" location, don't I need to see the cable marked as such? In other words, I can not assume its dual rated unless its actually marked as such, right?
Johnd85053 is offline   Reply With Quote
Old 02-05-2012, 03:15 PM   #7
Member
 
Julius793's Avatar
 
Join Date: Dec 2011
Location: New york
Posts: 1,053
Rewards Points: 500
Default

Upgraded loadcenter wiring questions


Quote:
Originally Posted by Jim Port
The supply houses carry it. Never had a problem finding it.
Well never either had a problem finding it I just never looked
__________________
Electricity will kill you if you give it a chance
Julius793 is offline   Reply With Quote
Old 02-05-2012, 03:15 PM   #8
" Euro " electrician
 
frenchelectrican's Avatar
 
Join Date: Apr 2006
Location: WI & France { in France for now }
Posts: 5,369
Rewards Points: 2,000
Default

Upgraded loadcenter wiring questions


Quote:
Originally Posted by Julius793 View Post
I've never can across #4 solid wire do you see it often?
I have ran into from time to time but they are very hard to bend them so a tip just grab a glove when you do bend them by hand but with tight bending radius you will need a brake line bender that how I dealt with them.

Merci,
Marc
__________________
The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )
frenchelectrican is offline   Reply With Quote
Old 02-05-2012, 05:30 PM   #9
Member
 
Join Date: Jan 2012
Location: Arizona
Posts: 35
Rewards Points: 25
Default

Upgraded loadcenter wiring questions


The markings on the THHN that I want to use has only "THHN" on it, not "THHN / THWN", for example. For dual rating, so I can use it in this "wet" location, don't I need to see the cable marked as such? In other words, I can not assume its dual rated unless its actually marked as such, right?
Can someone please confirm this marking question? Thanks.
Johnd85053 is offline   Reply With Quote
Old 02-05-2012, 05:35 PM   #10
" Euro " electrician
 
frenchelectrican's Avatar
 
Join Date: Apr 2006
Location: WI & France { in France for now }
Posts: 5,369
Rewards Points: 2,000
Default

Upgraded loadcenter wiring questions


Quote:
Originally Posted by Johnd85053 View Post
The markings on the THHN that I want to use has only "THHN" on it, not "THHN / THWN", for example. For dual rating, so I can use it in this "wet" location, don't I need to see the cable marked as such? In other words, I can not assume its dual rated unless its actually marked as such, right?
Can someone please confirm this marking question? Thanks.
If the marking say THHN only that is used for dry location and if marked THHN/THWN then it will be dual rated conductors.

Majorty of them I have them are useally dual rated so it is not a issue but double check the marking to make sure.

Merci,
Marc

__________________
The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )
frenchelectrican is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions about wiring a line voltage thermostat thinksincode Electrical 15 01-12-2012 08:50 PM
Sub panel wiring and voltage drop questions CPF Electrical 6 11-30-2011 07:52 AM
Wiring questions stalesweetness Electrical 0 11-21-2011 09:59 PM
Basement workshop wiring questions RCharles Electrical 3 08-18-2011 10:50 PM
Wiring gage questions microtcpip Electrical 6 03-27-2006 09:12 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.