What's Wrong Here?
Jan 10, 2006, By Joe Tedesco
Hint: Sing along with me. One of these things, doesn’t belong here...
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
Q. I recently came across a handhole with a metal cover in the backyard of a house that is used to splice the underground service conductors. I told the utility mechanic the cover needed to be grounded (bonded) because there could be accidental contact with live circuits....
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...
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
Q. What are the NEC grounding requirements for a satellite dish?...
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
Q. How far away must a 120/208V, 3-phase panelboard be located from a janitorial closet sink?...
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?...
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
Q. Electricians in our area ground the metal conduit that runs up a utility pole to a local ground rod. Is this a Code compliant installation?...
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
Q. A fellow electrician told me if I were to wire an aboveground storable pool pump motor for 240V operation, the receptacle outlet would need to be located 10 feet from the pool. I thought five feet was the minimum. Who’s right?...
Grounding vs Bonding - Part 11 of 12
Nov 1, 2005, By Mike Holt, NEC Consultant
Don’t let the bonding and grounding requirements of pools make you feel like you’re in over your head...
Code Quandaries
Nov 1, 2005, By Mike Holt, NEC Consultant
Q. A new exception was added to 250.50 in the 2005 NEC, which states that concrete-encased electrodes are not required for existing buildings or structures where the conductive steel reinforcing bars aren't accessible without disturbing the concrete. Why was this exception added to the 2005 NEC, and what does this all mean?...
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...
Code Q&A
Oct 24, 2005, By Mike Holt
Q. How close can I run underground service conductors in a raceway to an outdoor pool?...
