Code Quiz
Mar 26, 2006, By Steven Owen
Disregarding the Exceptions in 225.32, when are you not required to install a disconnecting means for a building or structure at the building or structure?...
Code Q&A
Mar 26, 2006, By Mike Holt
Q. What is the minimum burial depth requirement for residential service lateral conductors installed in rigid nonmetallic conduit?...
Code Quiz Correction
Mar 12, 2006, By Steven Owen
The answer to the question below, shown in the March 13 issue of CodeWatch, was incorrectly shown as: A) fire alarm systems. In retrospect, I should have added a fifth option, which read as follows: E) none of the above. This would be the correct answer in this case....
Code Q&A
Mar 12, 2006, By Mike Holt
Q. Can we install coaxial cables inside the duct work of an existing building?...
Applying Article 525 in Amusement Venues
Mar 1, 2006, By Mike Holt, NEC Consultant
If you do electrical work with temporary events, you obviously need to understand Article 525, which covers the installation of portable wiring and equipment...
Stumped by the Code?
Mar 1, 2006, By Mike Holt, NEC Consultant
Q. When wiring a circuit breaker, does the Code require supply conductors to terminate to the top (line side) of the breaker?...
Illustrated Catastrophes
Mar 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 Quiz
Feb 26, 2006, By Steven Owen
With respect to a solar photovoltaic system, a disconnecting means is required to disconnect all current-carrying conductors of a photovoltaic power source from all other conductors in a building or other structure. A switch or circuit breaker shall not be installed in a grounded conductor unless...
Code Q&A
Feb 26, 2006, By Mike Holt
Q. Is it good practice to bond the lightning protection system to the building grounding electrode system?...
What's Wrong Here?
Feb 26, 2006, By Joe Tedesco
Hint: Use your nose to help sniff out this violation....
Code Quiz
Feb 11, 2006, By Steven Owen
What is the maximum number of overcurrent devices permitted in a lighting and appliance branch-circuit panelboard? What is the maximum number of overcurrent devices permitted in a power distribution unit (PDU) of an information technology system?...
Code Q&A
Feb 11, 2006, By Mike Holt
Q. What size wire and breaker is required for an air-conditioner whose nameplate specifies the circuit conductor must have a minimum rating of 44A, with overcurrent protection not to exceed 60A? The terminals on the equipment are rated 75°C....
Illustrated Catastrophes
Feb 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...
Class and Division: Don't Break Rank on Your Next Installation
Feb 1, 2006, By Mike Holt, NEC Consultant
What exactly is a Class I location? Can you define it, or better yet, easily identify it in the field? You have a Class I location any time enough flammable...
Code Quandaries
Feb 1, 2006, By Mike Holt, NEC Consultant
Q. Is GFCI protection required for a 15A or 20A, 125V receptacle that is located within 6 feet of a janitorial closet sink in a commercial building?...
Code Quiz
Jan 25, 2006, By Steven Owen
When installing a grid structure at a dwelling unit swimming pool, the equipotential bonding grid shall cover the contour of the pool and the pool deck...
Code Q&A
Jan 25, 2006, By Mike Holt
Q. What is the largest size transformer permitted to be mounted above a suspended ceiling used for environmental air?...
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
Q. I understand the Code allows me to use Type AC cable with an equipment grounding (bonding) conductor for branch circuits serving patient care areas. Can I use Type MC cable with an equipment grounding (bonding) conductor for luminaires located above 7.5 feet in a patient care area?...
