national electrical code

SHOCKING STAT OF THE MONTH

Oct 1, 2007,

25% Percentage the Department of Homeland Security has indicated it will raise civil fines imposed on employers who knowingly hire illegal immigrants....

Illustrated Catastrophes

Oct 1, 2007, By Joe Tedesco, NEC Columnist

As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...

Article 230: Services Part 2

Sep 1, 2007, By Mike Holt, NEC Consultant

Part 1 of this two-part series, which ran in last month's August issue, explored how to ensure your service entrance equipment meets Code. Starting with...

Code Quandaries

Sep 1, 2007, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. Can Type MC cable be installed from fixture to fixture without support above a suspended ceiling?...

Illustrated Catastrophes

Sep 1, 2007, By Joe Tedesco, NEC Columnist

As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...

Stumped by the Code?

Aug 1, 2007, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. Are there any restrictions on the length of outside conductor (without overcurrent protection)...

Article 230: Services Part 1

Aug 1, 2007, By Mike Holt, NEC Consultant

Article 230, which consists of seven parts, provides the installation requirements for service conductors and equipment. Parts II, III, and IV address...

Illustrated Catastrophes

Aug 1, 2007, By Joe Tedesco, NEC Columnist

As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...

Article 225: Outside Branch Circuits

Jul 1, 2007, By Mike Holt, NEC Consultant

Article 225 provides installation requirements for outside branch circuits and feeders that run on (or between) structures or poles (Fig. 1). The NEC...

Code Q&A

Jun 13, 2007, By Mike Holt

Q. When a lighting and appliance panelboard is fed from the secondary of a 3-phase transformer, is the panelboard required to have a main breaker installed in it?...

Code Quiz

Jun 13, 2007, By Steven Owen

When installing a high-impedance grounded neutral system for a 480V, 3-phase electrical system, the following question arises. Where is the proper location for the grounding impedance (resistor)?...

Code Quandaries

Jun 1, 2007, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. Since the neutral is bonded to the case at the meter enclosure, do I still need to bond the neutral...

Article 215: Feeders

Jun 1, 2007, By Mike Holt, NEC Consultant

Last month, we looked at branch-circuit requirements in Art. 210. The next logical step up from the branch circuit is the feeder circuit. Thus, Art. 215,...

Eyes Wide Open

Jun 1, 2007, By Michael Eby, Editor-in-Chief

I just returned home from a visit to the great city of Boston. Although I didn't get to walk down The Freedom Trail or stop in The Paul Revere House,...

Illustrated Catastrophes

Jun 1, 2007, By Joe Tedesco, NEC Columnist

As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...

What's Wrong Here?

Jun 1, 2007, By Joe Tedesco, NEC Columnist

How well do you know the Code? Think you can spot violations the original installer either ignored or couldn't identify? Here's your chance to moonlight...

What is the minimum size and metal thickness required for a junction box constructed of sheet steel, with one 4-inch RMC conduit (per wall) connected on opposite walls of the box (i.e., directly across from one another)?...