Electrical Contractor Magazine

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.
 Type SE cable support


Article 240, in the National Electrical Code (NEC), provides general requirements for overcurrent protection and overcurrent protective devices.

For many years, Article 250, which covers grounding and bonding in the National Electrical Code (NEC), only contained two tables. Table 250.122 was used for sizing the equipment grounding conductors, based on the size of the overcurrent protective device in the circuit.

Energy management is becoming commonplace in today’s electrical infrastructures through the control of utilization equipment, energy storage and power production. Yet, limited consideration is found in electrical installation standards to actively manage these systems.

Electrical Contractor Magazine

More on Codes & Standards

 
Sizing Conductors, Part XV

Table 310.15(B)(16) in the National Electrical Code (NEC) provides allowable or maximum ampacities for insulated conductors rated up to and including 2,000 volts (V).

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A Unified Method

Lately, inspectors from a third-party inspection company have been asking me about determining the number of circuits required for outlets installed in dwelling units.

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Baseboard Heaters, Counting Loops and More

If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to codefaqs@earthlink.net.

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Sizing Conductors, Part XIV

Ambient temperature and the number of current-carrying conductors installed in a raceway or cable are two factors to consider when sizing conductors.

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Sun Protection

In the 2005 National Electrical Code (NEC), 310.10, fine print note No.

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Putting It in Reverse

Participants at one of my recent workshops had questions pertaining to reverse-fed transformers (back-fed). The input side was 480 volts (V), three-phase, and the output side was 120/208V.

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Signage Discrepancies, Counting Conductors and More

If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to codefaqs@earthlink.net.

READ MORE

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