When installing a messenger-supported wire, which of the following cable types are permitted to be installed?

  1. MV, MC, and MI cables.
  2. Multiconductor service entrance cable, which may use the messenger as a grounded conductor, as well as multiconductor underground feeder and branch circuit cable.
  3. Power and control tray cable, and power-limited tray cable.
  4. Other factory-assembled, mulitconductor control, signal, and power cables identified for the use.
  5. All of the above.

Answer: E

As noted in 396.10(A), there are many insulated cables and conductors permitted to be used with messenger-support wire. One of the key elements is to provide appropriate support by means of rings and saddles, or field-installed lashing material for conductor support.

The definition of "messenger-supported wiring" can be found in 396.2.

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.