Exploring Requirements for Information Technology Equipment 

Apr 1, 2006, By Mike Holt, NEC Consultant

If you've ever seen a shutoff switch located just outside an information technology (IT) room, you may have wondered who in their right mind would install...

Illustrated Catastrophes 

Apr 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 

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?...

What's Wrong Here? 

Mar 12, 2006, By Joe Tedesco

Hint: Is this a new type of splice box?...

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...

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?...

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...

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?...

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