Electical Contractor

As stated in 90.1(A) of the National Electrical Code (NEC), the purpose of the Code is the practical safeguarding of people and property from hazards arising from the use of electricity.

One of the most-referenced tables in the National Electrical Code (NEC) is Table 310.15(B)(16), formerly Table 310.16. It contains allowable ampacities of insulated copper and aluminum (or copper-clad aluminum) conductors rated up to and including 2,000 volts (V).

While teaching codes and standards across the United States, the question often arises why the National Electrical Code (NEC) incorporates so many requirements for signage. For example, orange has historically served as a warning to electrical personnel.

With the proliferation of electrical and electronic medical equipment in general care or critical care patient bed locations of a hospital, the number of branch circuits necessary to supply the equipment and the number of receptacles on these branch circuits becomes a real dilemma.

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.

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.

When sizing conductors, the number of current-carrying conductors installed in a raceway or cable must be considered. No conductor shall be used in such a manner that its operating temperature exceeds that which is designated for the type of insulated conductor involved [310.15(A)(3)].

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.

At a recent workshop that I was teaching, a question was asked about how the grounded conductor was to be installed and used when routed from the outside utility transformer to service equipment located inside the facility.