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. 

The National Electrical Installation Standards (NEIS) are the only American National Standards Institute-approved performance and workmanship industry standards for electrical construction.

Branch-circuit markings

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. Questions can be sent to Answers are based on the 2014 NEC.
 Branch-circuit markings

As Section 110.2 States, The National Electrical Code (NEC) provides installation requirements for electrical conductors and equipment that are either required or permitted to be installed. However, these conductors and equipment are only acceptable if the installation is approved.

The second article in the National Electrical Code (NEC), Article 100, contains definitions that are essential to the proper Code application. Article 110 contains many requirements that are essential to understanding and applying requirements located throughout the Code.

More on Codes & Standards

Portable Swimming Pools, Outdoor Cable and More

Article 100—Definitions; Article 210—Branch Circuits; Article 250—Grounding and Bonding; Article 334—Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS; Article 404—Switches; Article 517—Health Care Facilities; Article 680 Swimming Pools, Fountains, and Similar Installations; Article 700—Emergency S

Function Follows Form

Members of a workshop I instructed on the National Electrical Code (NEC) asked me how to determine the ampacities of conductors based on how they are used in the electrical system.

Kitchen Exhaust Fans, Baseboard Heaters and More

Article 210—Branch Circuits; Article 240—Overcurrent Protection; Article 250—Grounding and Bonding; Article 300—Wiring Methods; Article 356—Liquidtight Flexible Nonmetallic Conduit: Type LFNC; Article 358—Electrical Metallic Tubing: Type EMT; Article 424—Fixed Electric Space Heating Equipment Groun

Voltage Between Adjacent Devices

Occasionally, an electrical installation practice is discovered that is dangerous to both electrical maintenance personnel and the facility where it is located.

Protecting Transformers

Protection for transformers rated 600 volts or less is determined by selecting one of three levels of full load current (FLC) found in Table 450.3(B) of the National Electrical Code (NEC). Levels are based on either primary protection only or by providing both primary and secondary protection.