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...
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?...
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...
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 Q&A
Oct 24, 2005, By Mike Holt
Q. How close can I run underground service conductors in a raceway to an outdoor pool?...
Code Quiz
Oct 24, 2005, By Steven Owen
When grounding branch circuits – with respect to grounding requirements for receptacles and fixed equipment – in patient care areas of hospitals (critical care or general care areas), which of the following statements is correct?...
Code Quiz
Oct 7, 2005, By Steven Owen
A small strip mall consists of the following 10 tenants: a pharmacy; a 24-hour emergency medical treatment center, which provides a limited amount of critical care; and eight different retail shops. The common service disconnecting means for the entire group of tenants is equipped with ground-fault protection (one service and 10 feeders)...
Code Q&A
Oct 7, 2005, By Mike Holt
Behind the 2005 NEC Changes: Art. 409 Industrial Control Panels
Oct 1, 2005, By Steven Owen, National Code Seminars
Covering industrial control panels intended for general use and operating at 600V or less, including those without an appropriate third-party listing,...
Grounding vs Bonding - Part 10 of 12
Oct 1, 2005, By Mike Holt, NEC Consultant
Does the NEC require you to ground piping systems and structural steel? Be careful how you answer this question....
Speak Out - Finding AFCI Common Ground
Sep 23, 2005,
Code Q&A
Sep 23, 2005, By Mike Holt
Code Quiz
Sep 23, 2005, By Steven Owen
When installing a Combustible Gas Detection System (in industrial establishments with restricted public access, and using qualified personnel to service the installation) as a protection technique in a Class I hazardous (classified) location of Article 501, or a Zone location of Article 505, all but which of the following items shall be documented?...
