Electical Contractor

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)].

Let’s refresh our memory on the methods for choosing the correct codes and standards for an installation. With so many, it can be sometimes difficult to determine which requirements we must meet. In many states, there are conflicting codes. So where do you start?

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.

It was only a matter of time before green became codified. This spring, the International Code Council (ICC) officially will roll out its International Green Construction Code (IgCC).

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.

Safety is the main reason for the existence of the National Electrical Code (NEC). Its purpose is the practical safeguarding of persons and property from hazards arising from the use of electricity [90.1(A)].

Section 250.30 is the topic of much discussion in every workshop that I instruct on the changes in the 2011 National Electrical Code (NEC). The section has been completely rewritten in an effort to make the requirements easier to read, understand and apply.

Last month, I wrote about Informational Annex I in the 2011 National Electrical Code (NEC), which provides information on 110.14 for electrical connections and the requirements for proper torquing of electrical connections within and to electrical equipment.