Technical information

The same value is also reported on the same NEC and CEC tables.

1.3.1.2 Disconnecting Means

194-E UL 1494 NEMA

The term “disconnecting means” indicates a selector switch for the break off of

one or more motor starters for the purpose of carrying out safe servicing.

In NEC and CEC it is specified that a sectioning is necessary:

•for each motor starter;

•for each motor.

Is it enough to have a single device in order to perform all these functions, (e.g.

a main disconnecting switch)?

No, this device m ust only be dev oted to the motor start only (in addition to the

main disconnect switch).

As a general rule, this function is performed by the motor protector or by the

“suitable as motor disconnect”.

A particular case which one cannot ignore is when there is no visibility between

the motor and the panel feeding it.The safety regulations for the installation of a

disconnecting means in sight of the motor don’t permit unauthorised closures

during maintenance.

The local disconnection can be avoided where it is not practical or where there

are maintenance and surveillance procedures that prevent the access by non-

specialist personnel, providing that the disconnecting device on the panel (for

example the motor protector) is fitted with means for locking in open position (a

padlock or the like).

BRANCH CIRCUIT