Code Quiz

Jul 16, 2009 10:56 AM, By Steven Owen

When are two or more control circuits for permanent amusement attractions permitted to occupy the same cable, cable tray, enclosure, or raceway, without regard to whether the individual circuits are alternating current or direct current?

Never.
Any time, provided all conductors are insulated for the maximum voltage of any conductor in the cable, cable tray, enclosure, or raceway. [522.24(A)]
Only in limited circumstances, when meeting the requirements of 725.133.
Only when the control circuit conductors or cables are of the shielded type.

Answer: B

As per 522.24(A), "Control circuits shall be permitted to occupy the same cable, cable tray, enclosure, or raceway without regard to whether the individual circuits are alternating current or direct current, provided all conductors are insulated for the maximum voltage of any conductor in the cable, cable tray, enclosure, or raceway."

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.