Multifamily Dwelling Unit Service and Feeder Calculations 

Dec 1, 2009, By Mike Holt, NEC Consultant

How to calculate the service for a single-family or a multifamily dwelling...

Illustrated Catastrophes 

Dec 1, 2009, By Brian J. McPartland, NEC Consultant

More Code catastrophes uncovered and corrected in these faulty installations ...

Cranes, Hoists, and the NEC 

Nov 1, 2009, By Mark Lamendola, Electrical Consultant

Avoid confusion before your next lift by learning the National Electrical Code requirements in Art. 430 and 610...

Code Quandaries 

Nov 1, 2009, By Mike Holt, NEC Consultant

Q. Is it legal to splice conductors in an "LB" fitting?...

Dwelling Unit Calculations 

Nov 1, 2009, By Mike Holt, NEC Consultant

Apply demand factors for correct load calculations...

Illustrated Catastrophes 

Oct 1, 2009, By Brian J. McPartland, NEC Consultant

More Code catastrophes uncovered and corrected in these faulty installations...

Health Care Facilities 

Oct 1, 2009, By Mike Holt, NEC Consultant

Article 517 provides the requirements for those parts of health care facilities involving examination and treatment of patients...

Surge Suppression Devices 

Sep 9, 2009, By Mike Holt, NEC Consultant

Avoid transient voltage problems by understanding how to correctly apply Art. 285 of the National Electrical Code (NEC)...

Air-Conditioning and Refrigeration Equipment 

Sep 1, 2009, By Mike Holt, NEC Consultant

Article 430, the largest Article in the NEC, is commonly understood to be the “motor” Article...

Illustrated Catastrophes 

Sep 1, 2009, By Brian J. McPartland, NEC Consultant

These two installation photos were contributed by Pierre Belarge, president of Electrical Training Solutions in Elmsford, N.Y. Belarge, who is an International...

The Changing Power Needs of Nursing Homes 

Sep 1, 2009, By Burton Klein, P.E., Burton Klein Associates

In the 1960s, a group of surgeons and anesthesiologists in Arizona came up with a revolutionary concept that would forever change the face of medicine:...

Refrigeration Systems and the Electrician 

Sep 1, 2009, By David Herres, Master Electrician

One of the great inventions of our time in terms of its social impact and influence on the health care and food preservation industries refrigeration...

Code Quandaries 

Sep 1, 2009, By Mike Holt, NEC Consultant

Q. What are the NEC grounding requirements for satellite dishes?...

Pools and Spas — Part 3 of 3 

Jun 1, 2009, By Mike Holt, NEC Consultant

How to meet Art. 680 requirements for wiring fountains, pools, and spas per the National Electrical Code (NEC)...

Pools and Spas — Part 2 of 3 

May 1, 2009, By Mike Holt, NEC Consultant

How to meet Art. 680 requirements for wiring pools and spas per the National Electrical Code (NEC)...

The Evolution of Solar Photovoltaic Systems 

May 1, 2009, By Ron Slade, P.E., Solar Consultant

Although NEC rules for photovoltaic (PV) systems haven’t changed much over the years, confusion still surround some portions of Art. 690...

Stumped by the Code 

Apr 1, 2009, By Mike Holt, NEC Consultant

Q. 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?...

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....

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, By Mike Holt

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