national electrical code

Code Quiz

Jan 10, 2006, By Steven Owen

An equipotential plane installed at a catfish farm pond is required for the service equipment installed outdoors (adjacent to the pond), where the service equipment controls equipment is installed in and adjacent to the water....

Code Q&A

Jan 10, 2006, By Mike Holt

What's Wrong Here?

Jan 10, 2006, By Joe Tedesco

Hint: Sing along with me. One of these things, doesn’t belong here...

An Inside Look at Hazardous (Classified) Locations

Jan 1, 2006, By Mike Holt, NEC Consultant

When you're looking for answers on hazardous (classified) location questions, where should you turn? Think of Articles 500 through 517 as a mini codebook...

Illustrated Catastrophes

Jan 1, 2006, 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...

Code Quandaries

Jan 1, 2006, By Mike Holt, NEC Consultant

Stumped by the Code?...

Code Quiz

Dec 22, 2005, By Steven Owen

What is the minimum circuit ampacity and minimum size conductor required for the feeder conductors supplying the following group of electric arc welders?...

Code Q&A

Dec 22, 2005, By Mike Holt

Code Quiz

Dec 8, 2005, By Steven Owen

When grounding a large bridge crane in an industrial facility, such as a paper mill or steel mill (or any other location), which of the following statements is correct?...

Code Q&A

Dec 8, 2005, By Mike Holt

Code Quandaries

Dec 1, 2005, By Mike Holt, NEC Consultant

Q. I was told there is a 30-day limit for extension cord use in a commercial building. What's the story? A. Extension cords cannot be used as a substitute...

Beyond the 2005 NEC Changes: Art. 250 Grounding and Bonding

Dec 1, 2005, By Steven Owen, National Code Seminars

The grounding and bonding requirements of the NEC might just be the least understood and most incorrectly interpreted section of the Code. In fact, some...

Grounding vs Bonding - Part 12 of 12

Dec 1, 2005, By Mike Holt, NEC Consultant

How do you make communications systems safe? ...

Code Q&A

Nov 18, 2005, By Mike Holt

Code Quiz

Nov 18, 2005, By Steven Owen

What is the maximum number of multi-conductor cables (for control circuits only) permitted in an 18-inch wide by 4-inch deep ladder type cable tray?...

Code Quiz

Nov 7, 2005, By Steven Owen

What is the minimum cable tray width required for an installation that consists of six sets of 1,000 kcmil conductors (rated 600V) bundled in six sets of three-each conductors in an uncovered ladder type tray?...

Code Q&A

Nov 7, 2005, By Mike Holt

Illustrated Catastrophes

Nov 1, 2005, 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...