Codes & Standards


Essential to the work of the electrical contractor is knowledge of the National Electrical Code, the National Electrical Installation Standards and additional standards and codes administered by the National Fire Protection Association, the Occupational Safety and Health Administration and others. Here is a list of all our articles on codes and standards listed chronologically by issue date. 

Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to Answers are based on the 2017 NEC.
 Kitchen GFCIs

A friend recently sent me an email with this picture (right) of a manual fire alarm pull station mounted on the side of an electrical panelboard. My friend was inspecting the fire alarm system and was accompanied by the electrician who had installed both the fire alarm and electrical systems.

All of the chapters in the National Electrical Code (NEC) contain tables, but not all of the chapters contain articles. Chapter 9 does not contain any articles; this last chapter only contains tables. The first of two articles in Chapter 1 is Article 100, Definitions.

Reducing differences of potential between conductive equipment or other objects and ground (earth) helps minimize shock hazards in normal circuit operation.

More on Codes & Standards

Pedal to the Metal

A major revision to article 511, covering commercial repair and storage garages, appears in the 2008 National Electrical Code (NEC).

Breath of Fresh Air

A veteren electrician asked what the National Electrical Code (NEC) requirements are for installing cord-and-plug-connected room air conditioners. I thought the answer might be interesting to others. Determining ampacity and rating

Transformer Accessibility, Derating Conductors and More

Article 210 Branch Circuits; Article 240 Overcurrent Protection; Article 250 Grounding and Bonding; Article 310 Conductors for General Wiring; Article 450 Transformers and Transformer Vaults (Including Secondary Ties); Article 480 Storage Batteries Aluminum conductors with AFCIs

Know the Rules

Low voltage systems are often ungrounded, which is normal, but non-current-carrying metal parts of equipment associated with low voltage systems are generally required to be grounded if the supply system is grounded. This article reviews NEC requirements for grounding low voltage systems.

Outdoor Air Conditioning GFCIs, Locked-up Panelboards and More

Article 110 Requirements for Electrical Installations; Article 210 Branch Circuits; Article 250 Grounding and Bonding; Article 314 Outlet, Device, and Pull and Junction Boxes, Fittings, and Handholes; Article 350 Liquidtight Flexible Metal Conduit: Type LFMC; Article 517 Health Care Facilities; Art

Getting Your Ducts In a Row

For the past few National Electrical Code (NEC) cycles, there has been a concentrated movement by parts of the construction industry to permit fire alarm cables, burglar alarm cables, communications cables and signaling system cables to be installed in a fabricated duct or plenum used for environme