ECM Buyers' Guide

national electrical code

Pools and Spas — Part 1 of 3

Apr 1, 2009 12:00 PM, By Mike Holt, NEC Consultant

If Art. 680 of the National Electrical Code (NEC) has one overriding concern, it's to keep people and water separated from electricity. Article 680 applies to pools, spas, hot tubs, fountains, and similar bodies of water....


What's Wrong Here?

Correctly identify the Code violation in this month's photo, and you could win a set of insulated hand tools from Ideal Industries, Inc. valued at more than $125....

Pools and Spas — Part 1 of 3 

Apr 1, 2009, By Mike Holt, NEC Consultant

If Art. 680 of the National Electrical Code (NEC) has one overriding concern, it's to keep people and water separated from electricity. Article 680 applies to pools, spas, hot tubs, fountains, and similar bodies of water....

Stumped by the Code 

Apr 1, 2009, By Mike Holt, NEC Consultant

We have a 400A, 3-phase feeder that we want to wire with two parallel sets of 3/0 AWG conductors in the same raceway. Is this acceptable?...

Electrical Services — Part 2 

Mar 1, 2009, By Mike Holt, NEC Consultant

Looking at Fig. 230.1 in the NEC, we can see that the second and third major areas of Art. 230 provide requirements for service entrance conductors (Part...

680.26 Equipotential Bonding for Swimming Pools, Spas and Hot Tubs 

Feb 19, 2009, 

Electrical Services — Part 1 

Feb 1, 2009, By Mike Holt, NEC Consultant

If you look at Fig. 230.1 in the NEC, you'll see that Art. 230 divides neatly into three general of coverage. The first includes general requirements,...

How Much Working Space Is Enough? 

Jan 1, 2009, By Mike Holt, NEC Consultant

In order to create safe working conditions, OSHA and the NEC [110.26] provide working space requirements that vary according to the hazards involved with...

Hint: Is it bright enough in here? 

Nov 1, 2008, By Joe Tedesco, NEC Columnist

What's Wrong Here?...

Box Fill Calculations 

Nov 1, 2008, By Mike Holt, NEC Consultant

Box fill isn't just the number of wires in the box — it's the total volume of the conductors, devices, and fittings in a box....

Illustrated Catastrophes 

Nov 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)....

Sizing Junction Boxes 

Oct 1, 2008, By Mike Holt, NEC Consultant

The sizing requirements for pull boxes, junction boxes, handhole enclosures, and conduit bodies exist to prevent conductor insulation damage. Those requirements...

Illustrated Catastrophes 

Oct 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...

What's Wrong Here? 

Oct 1, 2008, By Joe Tedesco, NEC Columnist

How well do you know the Code? Think you can spot violations the original installer either ignored or couldn't identify? Here's your chance to moonlight...

Stumped by the Code? 

Oct 1, 2008, By Mike Holt, NEC Consultant

All questions and answers are based on the 2008 NEC. Q. I have a 1,200A, 480V panel that has a working space of 3 feet. The engineer says 7 feet is required....

Motor Calculations 

Sep 1, 2008, By Mike Holt, NEC Consultant

To prevent a motor from burning up, you must provide a means of protecting it from overcurrent (overload, short circuit, or ground fault). If you can remember not to confuse motor protection with circuit protection, you’ll eliminate a major point of confusion in motor calculations....

Illustrated Catastrophes 

Sep 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)....

Fill 'Er Up 

Aug 14, 2008, By Mike Holt, NEC Consultant

Raceways must be large enough to hold conductors without overheating and avoid insulation damage during conductor pulls. Therefore, we must determine the maximum number and size of conductors to put in a given raceway. That limit is what we mean by raceway fill....

Conductor Size Matters 

Aug 1, 2008, By Mike Holt, NEC Consultant

The NEC provides minimum size requirements for conductors to prevent overheating and fire....

Illustrated Catastrophes 

Aug 1, 2008, By Joe Tedesco, NEC Columnist

Alan Christofk, a superintendent with Gephart Electrical Construction in Stillwater, Minn., found this unique installation at a gas station...

Article 600: Electric Signs and Outline Lighting 

Jun 1, 2008, By Mike Holt, NEC Consultant

Every commercial occupancy needs a form of identification, the standard method of which is typically the electric sign. This is one reason why you'll be working with Art. 600 if you do much commercial or industrial work....

Cathodic Protection Systems and the NEC 

Jun 1, 2008, By Whitt L. Trimble and Eddie Guidry, Fluor Enterprises, Inc.

During the 2005 National Electrical Code (NEC) review cycle, a relatively simple revision was made that created a significant change on the cathodic protection (CP) systems of petroleum and chemical facilities (plants)....

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