Fill in the blanks with the correct answers. New requirements for marking of cable trays apply when the cable trays contain ____________ conductors [(230.44)], or conductors rated at more than _________ [(392.18(H)].

  1. branch circuit; 600V
  2. feeder; 35kV
  3. tray-rated; 2.4kV
  4. service entrance; 600V


Answer: D

There is a new paragraph in Sec. 230.44 that requires cable trays to be affixed with a permanent label with the wording "Service-Entrance Conductors" where the cable tray supports service-entrance conductors. The labels shall be located as to be clearly visible after the installation.

There is also a new paragraph in Sec. 392.18(H) that requires cable trays containing conductors rated at more than 600V to be affixed with a warning notice carrying the wording "DANGER – HIGH VOLTAGE – KEEP AWAY" in a readily visible position with a spacing not to exceed 10 ft.

ANSI Z-535.2 or ANSI Z-535.4 may provide additional guidelines for the warning notice.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.