national electrical code

Code Q&A

Sep 8, 2006, By Mike Holt

Q. I recently saw an advertisement for red conduit that is to be used for emergency circuits. Is this a Code requirement?...

Code Quandaries

Sep 1, 2006, By Mike Holt, NEC Consultant

Q. What size conductor is required for a 25-hp, 208V, 3-phase fire pump motor?...

Illustrated Catastrophes

Sep 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...

Article 725: Around the Circuit

Sep 1, 2006, By Mike Holt, NEC Consultant

Any time you are working with burglar alarm, access control, sound, nurse call, or intercom systems, as well as computer networks, lighting dimmer controls,...

Code Quiz

Aug 28, 2006, By Steven Owen

Code Q&A

Aug 28, 2006, By Mike Holt

Q. Can “line” and “load” conductors be installed in the same raceway?...

Grounding & Bonding Definitions

Aug 28, 2006, By Mike Holt

Why is grounding so difficult to understand? One reason is because many do not understand the definition of many important terms...

Code Quiz

Aug 14, 2006, By Steven Owen

Code Q&A

Aug 14, 2006, By Mike Holt

Q. What type of fitting can I use to terminate ground wires in a metal box?...

Stumped by the Code?

Aug 1, 2006, By Mike Holt, NEC Consultant

Q. Can 277V circuit conductors be placed within the same raceway with 120V circuit conductors?...

Illustrated Catastrophes

Aug 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...

Outsourcing Options

Aug 1, 2006, By Beck Ireland, Staff Writer

For the last few years, has been the buzzword in the plant maintenance world, and the numbers prove it. In 2004, consulting firm D.F. Blumberg Associates,...

Legally Required and Optional Standby Systems

Aug 1, 2006, By Mike Holt, NEC Consultant

Emergency power systems (Art. 700) are at the top of the hierarchy of backup power systems. Legally required standby systems, which fall under Art. 701,...

Code Quiz

Jul 25, 2006, By Steven Owen

Code Q&A

Jul 25, 2006, By Mike Holt

Q. Is liquidtight flexible metal conduit (LFMC) permitted under the raised floor of a computer room? If yes, must it be secured?...

Code Quiz

Jul 11, 2006, By Steven Owen

Code Q&A

Jul 11, 2006, By Mike Holt

Q. Can Table 310.15(B)(6) be used to size service conductors for a duplex?...

Stumped by the Code?

Jul 1, 2006, By Mike Holt, NEC Consultant

Q. Is GFCI protection required for a single-phase, 208V, 30A coffee maker receptacle in a commercial kitchen?...

Illustrated Catastrophes

Jul 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...