Electrical Construction & Maintenance (EC&M) Magazine
Home > NEC > Top 50 NEC Rules

Top 50 NEC Rules

Oct. 26, 2007 Mike Holt | Electrical Construction and Maintenance

Discuss this Article 2

Anonymous (not verified)
on Jun 8, 2012

Check two paragraphs on neutral conductors:
"The neutral conductor of a 3-wire single-phase 120/240V system, or 4-wire 3-phase 120/208V or 277/408V wye-connected system isn’t considered a current-carrying conductor.

The neutral conductor of a 3-wire circuit from a 4-wire 3-phase 120/208V or 277V/480V wye-connected system is considered a current-carrying conductor."

They contradict each other

Anonymous (not verified)
on Nov 2, 2012

Read again... The second is a 3 wire circuit from a 4 wire system. Not the same as a three wire system...

Post new comment
Sign In or register to use your Electrical Construction & Maintenance (EC&M) Magazine ID
(optional)
Related Articles

White Papers
LED Industrial Lighting: Common Myths and Facts
LEDs have unique and compelling characteristics that make them ideal for industrial lighting applications. But there are a variety of misconceptions about LEDs, how well they work, how long they last, and more. Digital Lumens developed this whitepaper to dish up the facts around LEDs and address some common misunderstandings....More
Understand Arc Flash Safety for Motor Control Centers
An arc flash is associated with the explosive release of energy caused by an electrical arc, due to either a phase-to-ground or a phase-to-phase fault. This kind of fault can result from many factors – a dropped tool, accidental contact with electrical systems, buildup of conductive dust, corrosion or improper work conditions.....More
VIEW MORE WHITE PAPERS
EC&M Learning Center
2011 Electrician Exam Preparation Book & Journeyman Simulated Exam
Printed in full color, the 2011Exam Prep book covers Theory, Code, and Calculations in great detail. Clear colorful graphics...
2011 Understanding NEC Requirement for Solar Photovoltaic Systems
Solar power is new to most in the electrical industry and this expanding and exciting industry has created many NEC...
Photovoltaics for Commerical and Utilities Power Generation
This book provides an in-depth review of the solar industry development, and present-day state of the art, emphasizing...
BROWSE ALL TITLES
Webinars
ON DEMAND: All You Ever Wanted to Know About GFCIs & AFCIs

Abstract:  In this webinar, Mike will not only explain the current NEC requirements for GFCIs and AFCIs, but he'll explain how they operate, what causes their premature failure, and when they won't provide the safety protection you might have thought they would.

 


Sponsored by:

 

 
ON DEMAND: Workplace Electrical Safety: Prevention before Protection


Abstract: This webinar will teach attendees the difference between risk and hazard, and how the choice of system grounding has a direct impact on reliability and safety.

 

 

Sponsored by:

 

 

MORE WEBINARS
EC&M TV
Apr. 15, 2013
video

The Westex Difference

Learn what sets Westex apart from other flame resistant fabric manufacturers....More

 

BROWSE ALL VIDEOS

Newsletter Signup

Connect With Us
Ecmweb.com
Related EC&M Sites
Copyright © 2013 Penton Media, Inc