ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Extension cords
by annemarie1. 09/20/18 08:54 AM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
1 registered members (gfretwell), 26 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
NEC Question on Electrician's Examination #78786
10/24/01 09:19 AM
10/24/01 09:19 AM
Joe Tedesco  Offline OP
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
Re: NEC Question on Electrician's Examination #78787
10/24/01 12:25 PM
10/24/01 12:25 PM
T
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.

Re: NEC Question on Electrician's Examination #78788
10/24/01 02:36 PM
10/24/01 02:36 PM
G
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.

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

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
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!
Re: NEC Question on Electrician's Examination #78790
10/24/01 06:40 PM
10/24/01 06:40 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
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

Re: NEC Question on Electrician's Examination #78791
10/25/01 08:21 AM
10/25/01 08:21 AM
Joe Tedesco  Offline OP
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
Re: NEC Question on Electrician's Examination #78792
10/25/01 08:54 AM
10/25/01 08:54 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
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

Re: NEC Question on Electrician's Examination #78793
10/25/01 11:24 AM
10/25/01 11:24 AM
R
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.

Re: NEC Question on Electrician's Examination #78794
10/25/01 05:29 PM
10/25/01 05:29 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
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

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

Page 1 of 2 1 2

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HappyElectrician
HappyElectrician
Penn USA
Posts: 31
Joined: December 2011
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 8
Popular Topics(Views)
249,445 Are you busy
187,360 Re: Forum
176,699 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.029s Queries: 15 (0.004s) Memory: 1.0258 MB (Peak: 1.2022 MB) Zlib enabled. Server Time: 2018-09-25 01:51:48 UTC