31.714

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31.714 application field and working principle

31.714 is a code from the National Electrical Code (NEC) that describes requirements for the installation of conductors exterior to buildings or other structures.

The purpose of 31.714 is to ensure that any exposed conductors used for the installation of a wiring system are protected from physical damage and the elements. The code establishes the minimum level of protection for conductors, depending on the environment in which they are installed.

31.714 applies to both wet and dry locations. In a wet location, the conductors must be installed in a conduit, either rigid nonmetallic or rigid metal. In a dry location, nonmetallic-sheathed cable (NM) must be used. The NEC also requires that the conductors be enclosed in a raceway.

The code also specifies that the conductors must be supported or fastened securely at appropriate intervals. The code further requires that the conductors be kept away from sharp edges, objects, actions of people or animals, and other potential sources of harm. The NEC also mandates that junction boxes and conduit fittings be used at all points where conductors divide.

In addition to protecting conductors from physical damage, 31.714 seeks to prevent contact and exposure to hazardous materials. The code requires that the conductors meet certain insulation requirements, such as the UL94 standard for flame retardance, as well as the UL1277 standard for thermal stability, among other standards.

Finally, the NEC specifies that conductors must be sized according to the maximum voltage and current that the conductors are likely to carry. It also requires that the conductors be insulated properly to prevent accidental contact with energized components.

The application of 31.714 and other NEC codes within the United States and Canada has helped to ensure that electrical systems are safe and reliable. By requiring that protective measures be taken to protect conductors from damage, contact with hazardous materials, and electrical overloading, the NEC has made it possible to use electrical wiring safely and efficiently.

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