Section 110.15 requires legible field marking of equipment enclosures for series combination ratings in accordance with 240.86(A) and (B). True or false?

Section 110.15 requires legible field marking of equipment enclosures for series combination ratings in accordance with 240.86(A) and (B). True or false?

• A. True
• B. False
• C. Not specified
• D. It depends

Answer: (B)

Legible markings on electrical equipment are required so installers can clearly see important data about the device, such as its ratings and listing. But the explicit field marking of series combination ratings is not a requirement described in that section. The rules governing when and how a series rating can be applied are found in the series rating provisions, specifically NEC 240.86. Those provisions explain what series ratings are allowed and under what conditions, and they indicate how the rating information should be presented on the equipment’s labeling. In other words, the labeling of a series rating is addressed by the series rating rules, not by a field-marking requirement in the section that covers general markings. Therefore, the statement as written is not correct.

Legible markings on electrical equipment are required so installers can clearly see important data about the device, such as its ratings and listing. But the explicit field marking of series combination ratings is not a requirement described in that section. The rules governing when and how a series rating can be applied are found in the series rating provisions, specifically NEC 240.86. Those provisions explain what series ratings are allowed and under what conditions, and they indicate how the rating information should be presented on the equipment’s labeling. In other words, the labeling of a series rating is addressed by the series rating rules, not by a field-marking requirement in the section that covers general markings. Therefore, the statement as written is not correct.