Transcript Shunt trip system - Cooper Industries

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Elevator Codes and
Standards
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Applicable Requirements
NFPA 13 requires
sprinklers in elevator
shafts (with some
exceptions) and in elevator
equipment rooms.
NFPA 72
ANSI/ASME A17.1
Safety Code for
elevators requires
that power to an
elevator be shut
down prior to the
release of water in
the elevator shaft
or electrical
equipment room.
The National Fire Alarm Code
requires: Control circuits to shut
down elevator power shall be
monitored for the presence of
operating voltage. Loss of voltage to
the control circuit for the
disconnecting means shall cause a
supervisory signal to be indicated at
the control unit and required remote
annunciation.
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Elevator System Disconnect Options
• Molded Case Circuit Breakers w/ shunt trip
• Fusible Switch with Fuses (with contactors for
shunt trip)
• Bussmann Power Module Switch/Panel with
Bussmann Low-Peak Fuses
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Elevator System Disconnect Options
• How is shunt trip actuated?
• By Fire Alarm System
• Via Heat Detector or Flow Switch
• Can these be directly connected?
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Accepted Method
Monitoring
Relay Contacts
Voltage
Supplying
Shunt Trip
Monitoring
Relay
Fire Alarm
System Contacts
Relay Contacts
Isolation
Relay
Shunt Trip Coil
Shunt Trip Coil
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NEC®
• National Electric Code®
• Enforced by Electrical Inspector
• Section 620.51
• Section 620.62
• Section 620.91(C)
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NEC®
Section 620.51(A) states:
(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 A17.1-2013/CSA B44-10, Safety Code for
Elevators and Escalators.
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NEC®
• Section 620.51(B) states:
• (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.
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NEC®
• Section 620.51(C) states:
• “Location. The disconnecting
means shall be located where it is
readily accessible to qualified
persons.”
• “Within Sight of the elevator controller”
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Back-up Power Requirements
NFPA 70
The National Electrical Code requires disconnect switches for elevators with
backup or auxiliary power (where the backup power is connected on the load
side) to be equipped with auxiliary contacts to disconnect the backup power
system.
620.91
(C)Disconnecting Means. The disconnecting means required by 620.51 shall
disconnect the elevator from both the emergency or standby power system and
the normal power system.
Where an additional power source is connected to the load side of the
disconnecting means, which allows automatic movement of the car to permit
evacuation of passengers, the disconnecting means required in 620.51 shall be
provided with an auxiliary contact that is positively opened mechanically, and the
opening shall not be solely dependent on springs. This contact shall cause the
additional power source to be disconnected from its load when the disconnecting
means is in the open position.
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On(Closed) Position
Battery
Lowering
Elevator
Disconnect
NC
Mechanically Interlocked
Aux. Contact
Elevator
Controller
M
To Piston
Drain Valve
S
Elevator
Motor
Solenoid
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Off(Open) Position
Battery
Lowering
Elevator
Disconnect
NC
Mechanically Interlocked
Aux. Contact
Elevator
Controller
M
To Piston
Drain Valve
S
Elevator
Motor
Solenoid
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On(Closed) Position
NC
COM
NO
Trip Bar
Auxiliary Switch
Line
Latch
Spring Loaded Contacts
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Off(Open) Position
NC
COM
NO
Auxiliary Switch
Trip Bar
Line
Latch
Spring Loaded Contacts
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On(Closed) Position
Disconnect
NC
COM
Fuses
NO
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No Mechanical Operation
Disconnect
NC
COM
Fuses
NO
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NEC® Selective Coordination Requirements
• Section 620.62 states:
• “Selective Coordination. Where more
than one driving machine disconnecting
means is supplied by a single feeder, the
overcurrent protective devices in each
disconnecting means shall be selectively
coordinated with any other supply side
overcurrent protective devices.”
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NEC® Selective Coordination Requirements
NFPA 70
National Electrical
Code
620.62
X
Elevator 1
Elevator 2
Elevator 3
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"Where more than one
driving machine
disconnecting means is
supplied by a single feeder,
the overcurrent protective
devices in each
disconnecting means shall
be selectively coordinated
with any other supply side
overcurrent protective
devices."
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NEC® Selective Coordination Requirements
NFPA 70
National Electrical
Code
620.62
X
Elevator 1
Elevator 2
Elevator 3
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“Selective Coordination
shall be selected by a
licensed professional
engineer or other qualified
person engaged primarily in
the design, installation, or
maintenance of electrical
systems. The selection
shall be documented and
made available to those
authorized to design, install,
inspect, maintain, and
operate the system."
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Power Module Switch at-a-glance
• 600Vac, 3-phase switch
• Available from 30 to 400A
• For single elevator applications
• All-in-one solution for elevator
disconnect requirements
• Shunt trip capability and voltage
monitoring
• UL 98 Listed for 200kA short-circuit
current rating
• Class J fusible branch circuit
protection
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Power Module Switch features
Shunt trip system
Easy inspection
Internally powered, relay activated shunt
trip system
Optional key-test switch and optional
pilot light makes inspection easy
Auxiliary contacts
Mechanically interlocked auxiliary
contacts
Circuit protection
Bussmann Low-Peak Class J
fuses
NEMA 1, 3R, 12 or 4
enclosure options
Triple padlock lockout/tagout
Flexibility for different installation
environments
Meets requirements for maintenance safety
procedures with up to three ¼” padlocks
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Power Module Panel at-a-glance
• 600Vac, 3-phase switch
• 30-200A feeder switches
• 400-800A main switches
• For multiple elevator applications
• All-in-one solution for elevator
disconnect requirements
• Shunt trip capability and voltage
monitoring
• UL 98 Listed for 200kA short-circuit
current rating
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23
Power Module Panel features
Shunt trip system
Easy inspection
Internally powered, relay activated shunt
trip system
Optional key-test switch and optional
pilot light make inspections easy
Circuit protection
Bussmann Low-Peak Class J
fuses
Auxiliary contacts
Mechanically interlocked auxiliary
contacts
Triple padlock lockout/tagout
Meets requirements for maintenance safety
procedures with up to three ¼” padlocks
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Summary of Applicable Codes, Listings, &
Standards
•
UL 98 Listed enclosed and dead front switches
•
Canadian Standards C22.2, No. 0-M91-CAN/CSA C22.2,
No. 4-M89 Enclosed switch
•
Elevator shutdown ANSI/ASME A17.1, 2.8.3.3.2
•
Elevator shutdown NEC® 620.51 (B)
•
Shunt trip voltage monitoring – NFPA 72, 6.16.4.4
•
NFPA 13-2013
•
Selective coordination – NEC® 620.62
•
Auxiliary contact (hydraulic elevator) – NEC® 620.91(C)
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