Go Back   InterNACHI Inspection Forum > >

Notices

Electrical Inspections Contains discussions about electrical systems. This includes receptacles, panels, wiring, etc.

Reply
 
Thread Tools
  #1  
Old 4/14/18, 11:04 PM
Christopher Currins, CMI Christopher Currins, CMI is offline
Certified Master Inspector ®
 
Join Date: Feb 2007
Location: Godfrey, IL
Posts: 17,339
Default 70 amp breaker with # 6 awg

feeder cable for subpanel in same building.

Yes or no?
Reply With Quote
Need a home inspection in North Dakota? Check out InterNACHI's listing of North Dakota certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #2  
Old 4/14/18, 11:19 PM
Dave Fetty, CMI's Avatar
Dave Fetty, CMI Dave Fetty, CMI is online now
Certified Master Inspector ®
 
Join Date: Feb 2014
Location: Naples all SWFL
Posts: 10,488
Default Re: 70 amp breaker with # 6 awg

No..




Dave Fetty Certified Master Inspector
Florida Home Inspection And Property Services LLC
www.FHIAPS.COM
www.NaplesBestInspector.com
www.FortMyersInspector.com
Naples, Marco Island, Ft. Myers, Bonita Springs, Estero, Cape Coral
Dfetty@FHIAPS.COM
http://https://www.facebook.com/pages/Flori...2450912?ref=hl
Florida Radon Measurement Technician R2547
(239)339-7380
Reply With Quote
  #3  
Old 4/14/18, 11:26 PM
Marc A. Goldenberg's Avatar
Marc A. Goldenberg Marc A. Goldenberg is offline
Certified Professional Inspector (CPI) ®
 
Join Date: Feb 2004
Location: Boca Raton, FL
Posts: 5,812
Default Re: 70 amp breaker with # 6 awg

#4 ,



http://www.alltropic.com


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Awards Committee Member
SUBMIT YOUR AWARD NOMINATIONS HERE

The InterNACHI Awards Committee is the final
authority of issuance of any award the committee offers.
Reply With Quote
  #4  
Old 4/15/18, 7:05 AM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,158
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: 70 amp breaker with # 6 awg

Quote:
Originally Posted by ccurrins View Post
feeder cable for subpanel in same building.

Yes or no?
Maybe. What is the wiring method? If it's not NM cable then it might be OK. #6 THHN is good for 65 amps at 75░ C. Next standard size OCPD is 70 amps.
Reply With Quote
  #5  
Old 4/15/18, 4:56 PM
Christopher Currins, CMI Christopher Currins, CMI is offline
Certified Master Inspector ®
 
Join Date: Feb 2007
Location: Godfrey, IL
Posts: 17,339
Default Re: 70 amp breaker with # 6 awg

Quote:
Originally Posted by Robert Meier View Post
Maybe. What is the wiring method? If it's not NM cable then it might be OK. #6 THHN is good for 65 amps at 75░ C. Next standard size OCPD is 70 amps.
Thanks Robert. I new there were exceptions, that's why I asked. The wiring Is NM cable. I have an "electrician" arguing a little. Same "electrician" that failed to isolate the neutrals at same sub-panel.
Reply With Quote
  #6  
Old 4/15/18, 6:58 PM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,158
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: 70 amp breaker with # 6 awg

Quote:
Originally Posted by ccurrins View Post
Thanks Robert. I new there were exceptions, that's why I asked. The wiring Is NM cable. I have an "electrician" arguing a little. Same "electrician" that failed to isolate the neutrals at same sub-panel.
You're welcome. Since you have NM cable then the 60░ C ampacity (55 amps) is the maximum permitted {334.80} even though the cable is made from 90░ C conductors. If you had THHN in a raceway or MC cable then the 75░ C ampacity may be used which is 65 amps. Since 65 amps is not a standard OCPD size in 240.6(A) then you can go up to the next standard size {240.4(B)} which is 70 amps.

With NM cable you're stuck with the 60░ C ampacity which is 55 amps, next standard size 60 amps.

So in answer to your question in the OP it depends on the wiring method. A #6 AWG feeder on a 70 amp OCPD may be compliant when it meets certain conditions.
Reply With Quote
  #7  
Old 4/15/18, 8:00 PM
Dave Fetty, CMI's Avatar
Dave Fetty, CMI Dave Fetty, CMI is online now
Certified Master Inspector ®
 
Join Date: Feb 2014
Location: Naples all SWFL
Posts: 10,488
Default Re: 70 amp breaker with # 6 awg

Thanks Robert.




Dave Fetty Certified Master Inspector
Florida Home Inspection And Property Services LLC
www.FHIAPS.COM
www.NaplesBestInspector.com
www.FortMyersInspector.com
Naples, Marco Island, Ft. Myers, Bonita Springs, Estero, Cape Coral
Dfetty@FHIAPS.COM
http://https://www.facebook.com/pages/Flori...2450912?ref=hl
Florida Radon Measurement Technician R2547
(239)339-7380
Reply With Quote
Reply

Thread Tools

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


All times are GMT -4. The time now is 3:13 PM.
no new posts