ECM Buyers' Guide

national electrical code

What's Wrong Here? 

Nov 8, 2004, By Joe Tedesco

Hint: Where's the listed or approved symbol on this extension cord?...

2005 Code Changes 

Nov 1, 2004, By Mike Holt, NEC Consultant, with introduction by EC&M staff

Has it already been three years? For some of you who wait with bated breath for every edition of the National Electrical Code, the 2005 NEC probably couldn't...

Code Calculations 

Nov 1, 2004, By Mike Holt, NEC Consultant

Transformer configuration names like and derive from the way the windings are connected inside the transformer. These connections determine the way the...

Everything You Need to Know About Switches, and More 

Nov 1, 2004, By Mike Holt, NEC Consultant

Just like the receptacle, which was covered in this column last month, switches are a common element in everyday life. You can find them at work, in public,...

The Almighty Code 

Nov 1, 2004, By Michael Eby, Editor-in-Chief

With its 50th edition about to hit the streets, the NEC has now seen more revisions than a lot of electrical industry professionals have celebrated birthdays,...

What's Wrong Here? 

Oct 22, 2004, By Joe Tedesco

Hint: This is a "hot" receptacle in more ways than one....

Code Q&A 

Oct 22, 2004, By Mike Holt

Code Quiz 

Oct 22, 2004, By Steven Owen

Code Q&A 

Oct 8, 2004, By Mike Holt

Code Quiz 

Oct 8, 2004, By Steven Owen

What's Wrong Here? 

Oct 8, 2004, By Joe Tedesco

Hint: The conduit and other raceway at the Park Street MBTA station in Boston is separated where passing through the sleeve to the station below....

Code Quandaries 

Oct 1, 2004, By Mike Holt, NEC Consultant

Stumped by the Code?...

Illustrated Catastrophes 

Oct 1, 2004, By Joe Tedesco, NEC Columnist

More Code catastrophes...

Commercial Load Calculations 

Oct 1, 2004, By Mike Holt, NEC Consultant

Knowing how to correctly size loads in commercial applications is an essential skill for electricians...

Article 406: Receptacles 

Oct 1, 2004, By Mike Holt, NEC Consultant

You might be surprised to learn just how many rules are associated with these simple devices...

Code Calculations 

Sep 23, 2004, By Mike Holt

Code Q&A 

Sep 23, 2004, By Mike Holt

What's Wrong Here? 

Sep 23, 2004, By Joe Tedesco

Hint: Store merchants use these receptacles to light up trees along the sidewalk....

Code Quiz 

Sep 23, 2004, By Steven Owen

Keep Your Cool When Working With A/C and Refrigeration Equipment 

Sep 15, 2004, By Mike Holt, NEC Consultant

Demand for knowledge of Art. 440 requirements is heating up...

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