Location for Elevator Shunt Trip

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KimoRowe

Member
Location
Ogden, UT
Could someone direct me to any code/standard (NFPA-70, NFPA-72, ASME A17, IBC, NFPA-101, etc.) reference that dictates where the Shunt Trip device Shall be, or that the Elevator Control Disconnecting Means and Shunt Trip Device Shall be the same?

Thanks!
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
I don't see anything in article 620 that calls for shunt trip but here is info on the disconnect. I did not copy it all

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.
 

KimoRowe

Member
Location
Ogden, UT
Disconnect May Automatically Open Power

Disconnect May Automatically Open Power

"the disconnecting means shall be permitted to automatically
open the power supply to the affected elevator(s) prior to
the application of water."

Yes as understood this the disconnect is allowed to contain the shunt trip device but is not required.
 

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Could someone direct me to any code/standard (NFPA-70, NFPA-72, ASME A17, IBC, NFPA-101, etc.) reference that dictates where the Shunt Trip device Shall be, or that the Elevator Control Disconnecting Means and Shunt Trip Device Shall be the same?

Thanks!

I don't believe there is any requirement that they MUST be the same. That said, they frequently ARE the same since a combo device is usually cheaper that two separate devices.
 

steve66

Senior Member
Location
Illinois
Occupation
Engineer
Since this specifically allows the shunt trip to be in the disconnecting means inside the equipment room, I would infer that there is a restriction somewhere on automatically opening a different source for the elevator.

But I can't say exactly where that restriction would be.

The elevator guys usually get what they want, and you can be pretty sure they don't want to go trekking through the building looking for that elusive shunt trip breaker.
 

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Since this specifically allows the shunt trip to be in the disconnecting means inside the equipment room, I would infer that there is a restriction somewhere on automatically opening a different source for the elevator.

But I can't say exactly where that restriction would be.

The elevator guys usually get what they want, and you can be pretty sure they don't want to go trekking through the building looking for that elusive shunt trip breaker.

A recent one I worked on had the shunt/disconnect in the main service room. Others have had the shunt/disconnect in the elevator machine room.
 

steve66

Senior Member
Location
Illinois
Occupation
Engineer
A recent one I worked on had the shunt/disconnect in the main service room. Others have had the shunt/disconnect in the elevator machine room.


Having the disconnect in the main service room is not allowed by the NEC. The disconnect has to be in the elevator equipment room. You can have another disconnect in the main service room (obviously something has to supply the elevator disconnect) but you can't have THE only disconnect in the main service room.

I don't believe having a shunt trip in the main service room is allowed either, but again, I don't know a specific code reference.
 

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Having the disconnect in the main service room is not allowed by the NEC. The disconnect has to be in the elevator equipment room. You can have another disconnect in the main service room (obviously something has to supply the elevator disconnect) but you can't have THE only disconnect in the main service room.

I don't believe having a shunt trip in the main service room is allowed either, but again, I don't know a specific code reference.

Hmmm, we didn't do the electrical on this, only the fire alarm. I don't recall if there was a disconnect in the elevator machine room or not. The shunt trip was definitely in the electrical service room
 

iwire

Moderator
Staff member
Location
Massachusetts
The shunt can be anywhere

The machine room is required to have a disconnecting means that may or may not include the shut trip.
 

steve66

Senior Member
Location
Illinois
Occupation
Engineer
The shunt can be anywhere

The machine room is required to have a disconnecting means that may or may not include the shut trip.

Are you sure? I don't have the elevator code, but I believe I've heard before that the shunt trip has to be in the machine room.
 
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