NC AMENDMENT 110.16

The marking requirement is to warn qualified people that a possible arc-flash hazard may exist.
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The marking requirement is to warn qualified people that a possible arc-flash hazard may exist.

Amend NEC® 2017, page 45:

110.16 Arc-Flash Hazard Warning. Electrical equipment, such as switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field or factory marked to warn qualified persons of potential electric arc flash hazards. The marking shall meet the requirements in 110.21(B) and shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment.

ELR commentary:

In North Carolina, the 2017 changes to this section were removed which would have required the nominal system voltage, Available Fault Current at the service overcurrent devices and the clearing time of the service overcurrent devices to also be field marked on the equipment by the electrician.

Now, only the arc-flash hazard warning labels are required as it was in the 2014 NEC®. These labels can be field, or factory applied.

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NC AMENDMENT 110.16

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

Which of the following is true of the marking required by NEC 110.16 as amended by NC?

A: This marking applies to service panelboards in dwelling units.
B: The marking is to indicate the clearing time of overcurrent devices.
C: The marking is to indicate the closing time of overcurrent devices.
D: The marking is to warn of potential electric arc flash hazards.
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