Hazardous (Classified) Locations — NEC Articles 500 through 517

Did you realize that in the 1920s (and no, I was not around to submit proposals or public inputs back then), hazardous (classified) locations...

Article 406 — Receptacles, Cord Connectors, and Attachment Plugs

Many requirements in Article 406 are often overlooked or taken for granted, including many details on exactly how to install and properly use everyday...

Selective Coordination for Critical Systems per the 2014 NEC

Selective coordination has been required for multiple elevators, supplied from a single feeder, since the 1993 National Electrical Code (NEC®). This requirement was based on a...

Load Side PV Connections

Through the exceptional efforts of the members of NFPA NEC Code-Making Panel 4 working with the proposals and comments that were submitted for the...

Center-Fed Load Centers and Panelboards

Based on the number of queries I get via phone and email, I sometimes think that more than half of the load centers in...

Enter the Nonmetallic-Sheathed Cable Interconnector

In the March-April 2014 issue, IAEI published an article entitled, “Maintaining a Safe and Reliable Electrical System. One of our members lodged his adamant...

Fuel Supply for Emergency and Stand-by Generators 

Some readers of this article may be surprised that this subject came to discussion. However, reality has demonstrated that this issue has created (and...

Vertical MC Cable Support in the 2014 NEC

The 2014 NEC has added language that affects only metal-clad (MC) cables with phase conductors 250 kcmil or larger. You may think of MC cable...

Grounding terminology and grounding requirements — is there a reason to...

Quite often Code users ask, “Is there a difference between a grounding conductor and ground grid conductor?”  Or, “Is there a difference between a...

Electrical Safety for Motor Fuel Dispensing Facilities

Perhaps the number one rule in advertising is for your advertisement to be seen. Thus, it is no surprise that electronic advertisements are placed...