In a Class I Division 2 location, when is it permissible to omit the normally required bonding jumper (of the wire type in compliance with 250.102) for liquidtight flexible metal conduit?

A. When the liquidtight flexible metal conduit is 6 ft or less in length, with fittings listed for grounding, and the overcurrent protection in the circuit is limited to 10A or less, and the load is not a power utilization load

B. When the circuit is 208V or less

C. When the circuit is rated at 20A or less

D. Never

 

Answer: A

When complying with the three conditions listed below [as per 501.30(B)], liquidtight flexible metal conduit may be used without a bonding jumper in a Class I Division 2 location.

1.  The liquidtight flexible metal conduit is 6 ft or less in length, and is installed with fittings listed for grounding.

2.  The overcurrent protection in the circuit is limited to 10A or less.

3.  The load is not a power utilization load.

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.