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. Questions can be sent to codefaqs@gmail.com. Answers are based on the 2014 NEC.
 Small generators can’t handle the load


I recently was asked to review a series of emails from a colleague about equipment requirements for ready access or, as defined in Article 100 and used within text in the National Electrical Code (NEC), as “readily accessible.” This phrase is used to describe the location of circuit breakers, for ex

What does the National Electrical Code (NEC) require when installing isolated/insulated grounding-type receptacles and auxiliary grounding electrodes?

Most of Article 240 in the National Electrical Code (NEC) provides general requirements for overcurrent protection and overcurrent protective devices not more than 1,000 volts (V), nominal. As a general rule, the overcurrent device rating shall not exceed the ampacity of a conductor.

More on Codes & Standards

 
The Assured Equipment Grounding Conductor Program
by Staff |

In keeping with the stated purpose of the National Electrical Code (NEC), the “practical safeguarding of persons and property…” protecting workers from electrical shock while using temporary power is of great concern for all electrical contractors.

READ MORE
 
Noteworthy Code Changes Concern Branch Circuits
by Staff |

Several changes in the 1999 National Electrical Code (NEC) in Article 210, Branch Circuits, are worthy of comment.

READ MORE
 
Article 370 - Boxes, Conduit Bodies, and Fittings
by Staff |

370-23(d)(2) Enclosures Fastened to Support Wires

READ MORE
 
Branch Circuits, Grounding, Flexible Metal Conduit, Motors, and Transformers
by Staff |

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuit, Feeder, and Service Calculations; Article 250—Grounding; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers; and

READ MORE
 
Installing Electrical Equipment in a Combustible Dust Location
by Staff |

Article 502 in the National Electrical Code (NEC) covers the installation of electrical equipment in a combustible dust location.

READ MORE
 
Safe Working Spaces around Electrical Equipment Allow Hasty Retreat
by Staff |

Over the past few months, we have discussed how good electrical design practice cannot and should not ignore the safety implications associated with the electrical installation.

READ MORE
 
Is It Worth Removing the Exceptions?
by Staff |

Herewith, various 1999 National Electrical Code (NEC) issues that do not warrant a whole page of discussion. This is an example of why it is wrong to follow a “remove exceptions” edict without first examining the consequences. The 1996 NEC, Section 410-12 reads as follows:

READ MORE

Pages