 |
|
03-07-2009, 08:07 PM
|
#61
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
400 Flexible cords
400.28(C)
It covers power cables. Many computer power cables use european color codes: light blue neutral, brown hot, grounded green / yellow
|
|
|
Join the #1 Electrician Forum Today - It's Totally Free!
ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!
Join ElectricianTalk.com - Click Here
|
Warning: The topics covered on this site include activities in which there exists the potential for serious injury
or death. ElectrcianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!
|
03-07-2009, 08:11 PM
|
#62
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
What is the maximum ampacity, number of conductors, and minimum conduit size for circuits protected by 30A Circuit Breakers using #10 wire with a grounding wire enclosed in a single IMC under the following conditions:
I THHN dry conditions 1 phase 120/240V service
II THWN wet or dry conditions 1 phase 120/240V service
III THWN-2 wet or dry conditions 1 phase 120/240V service
IV THHN dry conditions 3 phase 120/208V service
A 180, 10, ¾”
B 240, 13, 1”
C 270, 13, 1”
D 180, 9, 1”
E 270, 15, 1”
F none of the above
I ________
II ________
III _______
IV _______
Code References:
________________
________________
________________
________________
________________
________________
________________
|
|
|
|
|
03-08-2009, 08:38 AM
|
#63
|
|
Senior Member
Join Date: Nov 2007
Location: Miami Fla.
Posts: 531
|
Is there a typo in the above???
|
|
|
|
|
03-08-2009, 08:46 AM
|
#64
|
|
Wish I was in the water
Join Date: Aug 2007
Location: St. Cloud, Fl
Posts: 515
|
I agree there has to a typo, I'm not seeing a #10 carrying 270A
__________________
If you're gonna be stupid, you better be tough. 
|
|
|
|
|
03-08-2009, 09:36 AM
|
#65
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
Note that conductorS and circuit breakerS are plural
|
|
|
|
|
03-08-2009, 09:54 AM
|
#66
|
|
Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,490
|
Quote:
Originally Posted by jfwfmt
400.28(C)
It covers power cables. Many computer power cables use european color codes: light blue neutral, brown hot, grounded green / yellow
|
There is no 400.28 in the '08 or '05
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution. 
|
|
|
|
|
03-08-2009, 09:56 AM
|
#67
|
|
Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,490
|
Quote:
Originally Posted by JohnJ0906
There is no 400.28 in the '08 or '05
|
OK, 400.2 2(C)
Gotcha. 
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution.
|
|
|
|
|
03-08-2009, 10:54 AM
|
#68
|
|
Senior Member
Join Date: Jan 2009
Location: NC
Posts: 601
|
Quote:
Originally Posted by jfwfmt
400.28(C)
It covers power cables. Many computer power cables use european color codes: light blue neutral, brown hot, grounded green / yellow
|
Manufacturers have different rules than the EC under the NEC. The NEC does not allow light blue as a neutral.
__________________
Alice
"I complained because I had no shoes until I saw a man who had no feet."
|
|
|
|
|
03-08-2009, 11:11 AM
|
#69
|
|
Senior Member
Join Date: Jan 2009
Location: NC
Posts: 601
|
Quote:
Originally Posted by jfwfmt
Note that conductorS and circuit breakerS are plural
|
Are you saying what is the maximum amps the circuit can surge to on a circuit with a 30 amp OCP. It is obviously written poorly. A circuit cannot carry 180 amps or any of the above on a 30 amp OCPD for very long.
__________________
Alice
"I complained because I had no shoes until I saw a man who had no feet."
|
|
|
|
|
03-08-2009, 05:19 PM
|
#70
|
|
Senior Member
Join Date: Nov 2007
Location: Miami Fla.
Posts: 531
|
Quote:
Originally Posted by electricista
It is obviously written poorly.
|
And who are you to judge? You an English major?
I think I see where this question is headed. Lets look at this.
Quote:
|
Originally Posted by jfwfmt
A 180, 10, ¾”
|
Under condition I
Quote:
|
THHN dry conditions 1 phase 120/240V service
|
This conduit would have 6 ccc's. 180÷6=30A
I believe the question is looking for the amps of all the conductors in the conduit added together, yes?
|
|
|
|
|
03-08-2009, 05:23 PM
|
#71
|
|
Senior Member
Join Date: Jan 2009
Location: NC
Posts: 601
|
Quote:
Originally Posted by Chris Kennedy
You an English major?
|
No, I was born in American and I think I speak pretty good American.
__________________
Alice
"I complained because I had no shoes until I saw a man who had no feet."
|
|
|
|
|
03-08-2009, 05:45 PM
|
#72
|
|
Senior Member
Join Date: Nov 2007
Location: Miami Fla.
Posts: 531
|
Quote:
Originally Posted by electricista
No, I was born in American and I think I speak pretty good American.
|
LOL
|
|
|
|
|
03-08-2009, 07:11 PM
|
#73
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
Quote:
Originally Posted by electricista
Manufacturers have different rules than the EC under the NEC. The NEC does not allow light blue as a neutral.
|
Wrong, see NEC 2008,2005,&2002 400.22(C)
|
|
|
|
|
03-08-2009, 07:12 PM
|
#74
|
|
Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,490
|
Quote:
Originally Posted by electricista
Manufacturers have different rules than the EC under the NEC. The NEC does not allow light blue as a neutral.
|
Quote:
Originally Posted by JohnJ0906
OK, 400.2 2(C)
Gotcha.
|
Check that article right there. Light blue is allowed under the provisions of that article.
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution.
|
|
|
|
|
03-08-2009, 07:13 PM
|
#75
|
|
Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,490
|
Quote:
Originally Posted by JohnJ0906
Electrical systems shall be connected to earth in a manner that will -
a) limit the voltage imposed by lightning, line surges, or unintentional contact with higher voltage lines
b) stabilize the voltage to earth during normal operation
c) create a low-impedance fault path
d) a + b
e) all of the above
|
No one's going to answer that one? I thought it was an easy one.
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution.
|
|
|
|
|
03-08-2009, 07:14 PM
|
#76
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
Quote:
Originally Posted by JohnJ0906
OK, 400.2 2(C)
Gotcha.
|
OK, you got me 
I'll turn on the light rather than reading the NEC by the glow of the laptop screen.
|
|
|
|
|
03-08-2009, 07:22 PM
|
#77
|
|
Senior Member
Join Date: Jul 2008
Location: WV
Posts: 149
|
Quote:
Originally Posted by Chris Kennedy
And who are you to judge? You an English major?
I think I see where this question is headed. Lets look at this.
Under condition IThis conduit would have 6 ccc's. 180÷6=30A
I believe the question is looking for the amps of all the conductors in the conduit added together, yes?
|
You are moving in the right direction, the answer is wrong and there is a bunch of code references to cite.
The idea of the question is to determine how many 30A circuits you can put in a single conduit raceway under varying circumstances, using #10 wire. It has actual practical applications.
Getting the right answer requires you to understand several aspects of the code.
Keep trying
/s/ Jim WIlliams
[Note to English Majors, "is" refers to "bunch" not "references"]
|
|
|
|
|
03-08-2009, 08:49 PM
|
#78
|
|
Senior Member
Join Date: Oct 2008
Location: SE Wisconsin
Posts: 214
|
250.4 (A) (1) NEC 2008
What is the minimum height for a 480 V luminaire to be installed in a parking lot?
|
|
|
|
|
03-08-2009, 09:07 PM
|
#79
|
|
Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,490
|
Quote:
Originally Posted by ralpha494
250.4 (A) (1) NEC 2008
What is the minimum height for a 480 V luminaire to be installed in a parking lot?
|
22 feet. 210.6(D)(1)(a)
All boxes and conduit bodies, covers, extension rings, plaster rings and the like shall be durably and legibly ______________.
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution.
|
|
|
|
|
03-09-2009, 05:36 AM
|
#80
|
|
Senior Member
Join Date: Nov 2007
Location: Miami Fla.
Posts: 531
|
Quote:
Originally Posted by JohnJ0906
22 feet. 210.6(D)(1)(a)
All boxes and conduit bodies, covers, extension rings, plaster rings and the like shall be durably and legibly ______________.
|
marked with the manufacturer's name or trademark. (314.44)
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
