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.
 Pull-through angle connectors?


Some photovoltaic (PV) inverter manufacturers have designed and built transformer-less inverters to add to their existing line of transformer-type inverters for installation in the United States. Transformer-less inverters have been popular in Europe for quite some time.

Article 430 of the National Electrical Code (NEC) covers motors, motor branch-circuit and feeder conductors, motor branch-circuit and feeder protection, motor-overload protection, motor-control circuits, motor controllers, and motor-control centers.

During a recent National Electrical Code (NEC) training program, inquiries about ground-fault protection of equipment (GFPE) were raised.

More on Codes & Standards

 
The NEC requires an effective ground-fault current path for medium- and high-voltage services.
Gone To Ground

Part X of Article 250 in the National Electrical Code (NEC) provides the grounding requirements for systems and circuits of greater than 1,000 volts (V).

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As Seen On Canadian TV

During a recent training program on the National Electrical Code (NEC), a question arose about panelboards and whether they could be installed in a horizontal orientation rather than vertically. This has come up often, probably due to various home-improvement broadcasts that are produced in Canada.

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NECA Offers OSHA Friendly Advice

In February’s column, I discussed why the Electrical Transmission & Distribution (ET&D) Partnership is an example of an Occupational Safety and Health Administration (OSHA) cooperative program that has worked out extremely well.

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Removing Old Cable, Bonding Hot Tubs And More

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.
 Abandoned cable in ceiling


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Sizing Conductors, Part XXXV

Transformer secondary conductor rules are similar to the rules for tap conductors. Rules for transformer secondary conductors and tap conductors are even in the same section of the National Electrical Code (NEC).

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The Arc Energy Covenant

Available fault current, short-circuit current rating, arc energy, arc flash hazards, and incident energy are closely related in both the National Electrical Code (NEC) and NFPA 70E, Standard for Electrical Safety in the Workplace.

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Installation Parameters

Recently, a question came up regarding installing overcurrent protection for dry-type transformers rated less than 1,000 volts (V). The transformer installation is a 150-kilovolt-ampere, three-phase unit with a 480V primary and a 208Y/120V secondary.

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