Figure 7-5.Motor controllers basic rules and exceptions.
motors of the group should be permitted to serve the
distance of more than 50 feet (15.3 meters) is
group of motors under any one of the following
Where a number of motors drive several parts of
a single machine or a piece of apparatus, such as
metalworking and woodworking machines,
cranes, hoists, and similar apparatus.
Where a group of motors is under the protection
of one overcurrent device, as permitted in NEC®
Where a group of motors is located in a single
room within sight of the controller location. A
considered equivalent to being out of sight.
DISCONNECTING MEANS, MOTORS, AND
CONTROLLERS (NEC® 430, PART H)
Each motor, along with its controller or magnetic
starter, must have some form of approved manual
disconnecting means, rated in horsepower, or a circuit
breaker. This disconnecting means, when in the OPEN
position, must disconnect both the controller and the
motor from all ungrounded supply conductors. It must
plainly indicate whether it is in the OPEN or the
CLOSED position and may be in the same housing as