Illustrated Catastrophes
Jun 1, 2008, By Joe Tedesco, NEC Columnist
Gary Parker, P.E., Burns & McDonnell, Centennial, Colo., found a circuit breaker panel installation that's gone through a few changes that do not comply with the NEC....
Ohio Home Builders Fight 2008 NEC Adoption
Jun 1, 2008,
The purpose of the National Electric Code (NEC) is the practical safeguarding of persons and property from the hazards arising from the use of electricity....
UL 1449 and the 2008 NEC
Jun 1, 2008, By Joseph DeGregoria, Underwriters Laboratories
The use of surge protective devices (SPDs) within residential, commercial, and industrial applications has sharply increased over the last decade...
Article 450: Transformers and Transformer Vaults
May 1, 2008, By Mike Holt, NEC Consultant
The operation of any facility depends on power distribution, which, in turn, depends on transformers. Safe and reliable operation of transformers is crucial...
Illustrated Catastrophes
May 1, 2008, 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...
Illustrated Catastrophes
Apr 1, 2008, 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 424: Fixed Electric Space Heating
Apr 1, 2008, By Mike Holt, NEC Consultant
Considering the fact that it has nine parts, at first glance, Art. 424 might seem like overkill for a device as simple as a heater. Walk into any hardware...
Grounding and Bonding of Separately Derived Systems
Mar 1, 2008, Mike Holt, NEC Consultant
Separately derived systems (SDSs) include most transformers as well as any generator or UPS supplying a transfer switch that opens the neutral conductor....
Can You Hear Me Now?
Mar 1, 2008,
Despite protestations from the International Association of Electrical Inspectors (IAEI) Michigan Chapter, on Nov. 23, 2007, the 2005 Michigan Electrical...
Transformer Secondary Conductors
Feb 1, 2008, By Mike Holt, NEC Consultant
Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing. Let's take a closer look at 240.21(C)...
Illustrated Catastrophes
Feb 1, 2008, 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...
Feeder Taps
Jan 1, 2008, By Mike Holt, NEC Consultant
Sometimes, it makes sense to tap into a feeder conductor to power another conductor. From Art. 100, we know that a feeder conductor runs between service...
AFCI Article Sparks Reader Debate
Jan 1, 2008,
Your magazine is very informative. I would like to comment on the article by Gerald Winstanley from NEMA, starting on page C34 of the November 2007 issue....
Illustrated Catastrophes
Dec 1, 2007, 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 708: Critical Operations Power Systems
Nov 1, 2007, By Michael A. Anthony, P.E., University of Michigan; Robert G. Arno, EYP Mission Critical Facilities
Focusing on the complex interplay among mechanical and electrical systems needed to support critical infrastructure, Art. 708 is one of four new Articles...
Code Changes 2008
Nov 1, 2007, By Mike Holt, NEC Consultant
It's hard to believe it's that time again, but the 2008 NEC is upon us. In this latest Code cycle, the Code Making Panels (CMPs) sifted through 3,688...
Illustrated Catastrophes
Nov 1, 2007, 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...
Top 50 NEC Rules
Oct 26, 2007, By Mike Holt
Illustrated Catastrophes
Oct 1, 2007, 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 240: Overcurrent Protection
Oct 1, 2007, By Mike Holt, NEC Consultant
Article 240 provides the requirements for selecting and installing overcurrent protection devices (OCPDs). Depending on your application, other Articles...
