ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Dimmable LED 2x4 lay in fixtures
by HotLine1. 04/24/17 05:43 PM
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
Electrode boilers question
by SteveFehr. 04/21/17 08:32 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,715 Are you busy
169,462 Re: Forum
162,767 Need opinion
Who's Online Now
0 registered members (), 42 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#78786 - 10/24/01 09:19 AM NEC Question on Electrician's Examination  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Here's a question that was on an electrician's test. The student answered (d) as the correct one. He was told he was incorrect?

What is the correct answer?

Note: See 110-5, and that no insulation, or conductor material was given?

Question No. 9: Which of the following statements about the general requirements for number 6 conductors is true?

(a) It is required to be terminated at 75 degree C ampacity.

(b) It is required to be terminated at 60 degree C ampacity.

(c) It must have insulation rated 60 degree C ampacity.

(d) It must have insulation rated 75 degree C ampacity.

I will invite the student to join this board so he can add more on this subject.


Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#78787 - 10/24/01 12:25 PM Re: NEC Question on Electrician's Examination  
TWM1  Offline
Junior Member
Joined: Sep 2001
Posts: 3
Ft Hood, Texas, US
The general rule would apply and the only possible answer with what is given is that it needs to be terminated at 60 degrees.


#78788 - 10/24/01 02:36 PM Re: NEC Question on Electrician's Examination  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
I tend to agree, with no further info I would have to apply 110-14 C and assume (dangerous, huh ? especially on a test) that it would be terminated in unknown terminations, which would mean you have to assume under 100 amps and terminate it at it's 60 deg. C ampacity. If that was the wording with no further explanation, it was broad based, KINDA vague.


#78789 - 10/24/01 04:04 PM Re: NEC Question on Electrician's Examination  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
I tend to agree with the other two posts.

Since there is no Insulation type given, this could be anything from TW [60 degree C], to THHN [90 degree C].

Since we can use Conductors with THHN Insulation and rate them at 60 degrees C for wet locations, or 90 degrees C for dry locations [for ampacity adjustments], this would exclude (c) and (d).

Since we are to use the 60 degree ampacity column in 310-16 for conductors sized #14 through #1, this would eliminate (a).

By default, the only remaining answer would be (b).

Scott SET


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

#78790 - 10/24/01 06:40 PM Re: NEC Question on Electrician's Examination  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
NY, USA
Joe,

I think it's a poorly worded question and could be viewed different ways.

I think that it would be (b) or (c) depending on what they were looking for.
I would lean torward (c) with 60C as a Minimum rating.

Question:

Is 75C wiring also rated 60C ?


Bill


#78791 - 10/25/01 08:21 AM Re: NEC Question on Electrician's Examination  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Bill:

I agree that the question may be poorly worded. Seems like we all agree on the correct answer.


Joe Tedesco, NEC Consultant

#78792 - 10/25/01 08:54 AM Re: NEC Question on Electrician's Examination  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
NY, USA
Joe,

I'm not sure which answer we're all agreeing on. I see (b)s and my (c)answer. (Or, do you mean that we all agree it is poorly worded)

Does the NEC consider a 75C conductor as also being rated 60C ? like dual-rated?

Bill


#78793 - 10/25/01 11:24 AM Re: NEC Question on Electrician's Examination  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Bill,
I understand that the temp. rating is the MAXIMUM temp. that the insulation can withstand without beginning to physically degrade. Therefore, if it is rated for 75 deg., any temp below is acceptable.


#78794 - 10/25/01 05:29 PM Re: NEC Question on Electrician's Examination  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
NY, USA
Redsy,

Yes, I understand. I was just wondering if that would be proper terminology to state that 75C wire is also rated 60C. I'm just asking for the purposes of this test Question but I guess that it doesn't really matter.

Joe,

You didn't tell us what was considered to be the correct answer??

Bill


#78795 - 11/02/01 11:40 AM Re: NEC Question on Electrician's Examination  
atran  Offline
Junior Member
Joined: Nov 2001
Posts: 1
Cudahy,WI,53110
Bill,
The answer is "C" !!!


Page 1 of 2 1 2

Member Spotlight
noderaser
noderaser
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.020s Queries: 15 (0.004s) Memory: 0.8184 MB (Peak: 0.9919 MB) Zlib enabled. Server Time: 2017-04-26 09:48:24 UTC