Disconnecting Means

DOE-HDBK-1092-2004

6.2.2

DISCONNECTING MEANS

The disconnecting means provided for cranes and hoists may consist of two or more lock-open-

type motor circuit switches or circuit breakers. Article 610, Part IV, of the NEC, "Disconnecting

Means," and the installation and operating plans should be studied carefully to determine the

disconnecting means requirements and locations. The two basic disconnects to consider are:

1. The runway conductor (conductors run along a crane runway for power or control)

disconnect shall be installed in accordance with NEC 610.31.

The crane and hoist disconnect which shall be provided in the leads from the runway

contact conductors or other power supply in accordance with NEC 610.32.

Figure 6-1(a). An additional control switch or a remote control switch is required if the

second disconnecting means is not accessible to the operator.

6-3