24.1-06-01-10. Requirements for electrical installations.

There are many electrical products on the market that have not been listed or certified by a NRTL.
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There are many electrical products on the market that have not been listed or certified by a NRTL.

Product certification (listing) is generally done by Nationally Recognized Testing Laboratories (NRTL’s).

Many (but not all) NEC® Articles specifically require electrical equipment and wiring materials to be listed. NEC® Section 410.6 requires all luminaires, lampholders, and retrofit kits to be listed. NEC® Article 240 addresses overcurrent protection such as fuses and circuit breakers but has no specific requirement that all overcurrent devices must be listed.

NEC Article 100 defines “listed” as follows:

Listed. Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose.

The State of North Dakota has specific rules on product listing where the NEC® is silent. Refer to the Laws, Rules and Wiring Standards of North Dakota for additional information.

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24.1-06-01-10. Requirements for electrical installations.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true regarding unlisted electrical equipment installed in North Dakota?

A: Manufacturing firms that install industrial machinery for use by the firm itself and employ professional engineers may evaluate the industrial machinery according to UL 508.
B: Wiring materials and equipment are only required to be listed by nationally recognized testing laboratories where the NEC requires it.
C: All equipment shall be listed by OSHA.
D: Electrical equipment can only be installed after it has been field evaluated by a NRTL.
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