VI. Disconnecting Means and Control
620.51 Disconnecting Means. A single means for disconnecting
all ungrounded main power supply conductors for
each unit shall be provided and be designed so that no pole
can be operated independently. Where multiple driving machines
are connected to a single elevator, escalator, moving
walk, or pumping unit, there shall be one disconnecting
means to disconnect the motor(s) and control valve operating
magnets.
The disconnecting means for the main power supply
conductors shall not disconnect the branch circuit required
in 620.22, 620.23, and 620.24.
(A) Type. The disconnecting means shall be an enclosed
externally operable fused motor circuit switch or circuit
breaker that is lockable open in accordance with 110.25.
The disconnecting means shall be a listed device.
Informational Note: For additional information, see
ASME A17.1-2010/CSA B44-10, Safety Code for Elevators
and Escalators.
Exception No. 1: Where an individual branch circuit supplies
a platform lift, the disconnecting means required by
620.51(C)(4) shall be permitted to comply with 430.109(C).
This disconnecting means shall be listed and shall be lockable
open in accordance with 110.25.
Exception No. 2: Where an individual branch circuit supplies
a stairway chairlift, the stairway chairlift shall be
permitted to be cord-and-plug-connected, provided it complies
with 422.16(A) and the cord does not exceed 1.8 m
(6 ft) in length.
(B) Operation. No provision shall be made to open or
close this disconnecting means from any other part of the
premises. If sprinklers are installed in hoistways, machine
rooms, control rooms, machinery spaces, or control spaces,
the disconnecting means shall be permitted to automatically
open the power supply to the affected elevator(s) prior to
the application of water. No provision shall be made to
automatically close this disconnecting means. Power shall
only be restored by manual means.
Informational Note: To reduce hazards associated with
water on live elevator electrical equipment.
(C) Location. The disconnecting means shall be located
where it is readily accessible to qualified persons.