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For EC&M Magazine
By Mike Holt, NEC® Consultant
Here's the follow-up to yesterday's newsletter.
This includes the answers to the questions sent, so you can see how you did.
Figure 01
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Figure 01
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For EC&M Magazine
By Mike Holt, NEC® Consultant
Here's the follow-up to yesterday's newsletter.
This includes the answers to the questions sent, so you can see how you did.
Note: The answers to these questions are based on the 2020 NEC.
Q1. What does the NEC require for protection of flexible cords or cables used for wiring methods at carnivals, circuses, or fairs?
A1. Protection. Flexible cords or flexible cables accessible to the public must be arranged to minimize the tripping hazard and they can be covered with nonconductive matting secured to the walkway surface or protected with another approved cable protection method, provided that the matting or other protection method does not constitute a greater tripping hazard than the uncovered cables. Burying cables is permitted and the burial depth requirements of 300.5 do not apply [525.20(G)].
Q2. What are the Code requirements for GFCI protection of receptacles and equipment at carnivals, circuses, and fairs?
A2. GFCI-Protected Receptacles and Equipment [525.23(A)]
(A) GFCI Protection Required. In addition to the requirements of 210.8(B), GFCI protection must be provided for the following:
(1) 15A and 20A, 125V nonlocking‑type receptacles readily accessible to the general public or used for disassembly and reassembly of amusement rides and attractions.
(2) Equipment readily accessible to the general public if it is supplied from a 15A or 20A, 120V branch circuit.
GFCI protection can be integral with the attachment plug or located in the power‑supply cord within 12 in. of the attachment plug, or listed cord set incorporating GFCI protection.
Q3. What is the Code definition of equipotential plane as applied to agricultural buildings?
A3. Equipotential Plane, (as applied to agricultural buildings). An area where conductive elements are embedded in or placed under concrete and bonded to all metal structures and nonelectrical equipment that could become energized and connected to the electrical system to minimize voltage differences within the plane [547.2]. Figure 01
Q4. What is the NEC requirement when installing a separate equipment grounding conductor underground at an agricultural building?
A4. Separate Equipment Grounding Conductor. Where the equipment grounding conductor is not part of a listed cable assembly, it must be insulated when installed underground [547.5(F)] .
Q5. What are the specific NEC requirements for GFCI protection at agricultural buildings?
A5. Ground-Fault Circuit-Interrupter Protection. GFCI protection must be provided as required in 210.8(B), but GFCI protection is not required for receptacles rated 30A or more installed within the following areas:
(1) In areas having an equipotential plane in accordance with 547.10(A).
(2) Outdoors.
(3) In damp or wet locations.
(4) In dirt confinement areas for livestock.
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