national electrical code

Code Q&A

Sep 8, 2006, By Mike Holt

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...

Code Quandaries

Sep 1, 2006, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. What size conductor is required for a 25-hp, 208V, 3-phase fire pump motor (see Figure)? A. Size...

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

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

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,...

Stumped by the Code?

Aug 1, 2006, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. Can 277V circuit conductors be placed within the same raceway with 120V circuit conductors? A....

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

Code Quiz

Jul 11, 2006, By Steven Owen

Code Q&A

Jul 11, 2006, By Mike Holt

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...

Stumped by the Code?

Jul 1, 2006, By Mike Holt, NEC Consultant

All questions and answers are based on the 2005 NEC. Q. Is GFCI protection required for a single-phase, 208V, 30A coffee maker receptacle in a commercial...