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ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.2 1.3.7.4 2.1.1 4.1 5.1.1.1. 1.1 5.1.1.2.1 .3 5.1.1.2.1 .7 5.1.1.2. 1.12e 5.1.2 .20

ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

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Page 1: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

ACADs (08-006) Covered

KeywordsSwitchgear, motor control, ground, circuit breaker.

Description

Supporting Material

1.3.7.2 1.3.7.4 2.1.14.1 5.1.1.1.1.1 5.1.1.2.1.3

5.1.1.2.1.7 5.1.1.2.1.12e 5.1.2.20

Page 2: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

SESSIONS 27 and 28

4160V Switchgear 480V Switchgear

480V Motor Control Centers

Page 3: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Rule of Thumb

• 0 - 49 HP 480V MCC• 50 - 249 HP 480V Bus• +250 HP 4160V Bus

Page 4: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

• Hand out and review drawings:

• SD-2500-01• SD-2548-04

Page 5: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Switchgear Assembly

Page 6: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Cubicle(Front)

Relays Fuse BlockRelays

4160v Circuit

Breaker

Indicator Lights

Indicator Lights

Page 7: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Cubicle(Front)

Fuse Block

52h Switch52s Switch

Typical Tagging Points

Page 8: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Cubicle(Breaker Removed)

Shutterguard Clamp/Lock

Primary Contacts(Stabs)

Actuator arm for auxiliary relays above

Grounding Strap

Secondary Contacts(Auxiliary)

Shutterguard(Closed)

Shutterguard(Open)

Bus Ports & Connections

Page 9: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Cubicle(Back)

Current Transformer

Current Transformer(s)

Bus Bar(s)

Maple Plug

Page 10: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Racking Mechanism

Racking Crank(Bar)

Racking Crank(Bar)

4160v Circuit

Breaker

4160v Circuit

Breaker

Switchgear Compartment

Door

Sliding Panel

Unlock Lever

Page 11: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker(Front)

Ground

Charging Lever

Closing Springs

5th Wheel Fitting

Charging Motor Switch

Manual Trip

Pushbutton

Position Indicator

Counter

Racking MechanismManual

Close Lever

Page 12: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker(Back)

Primary Contacts(Stabs)

Secondary Contacts(Auxiliary)

Arc Chutes

Ground

Puffer(s)

Page 13: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit Breaker Movable & Stationary Contacts

Puffer

Movable Arcing

Contact

Movable Main

Contact

Stationary Arcing

Contact

Stationary Main

Contact

NormalContact Wear

Page 14: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit BreakerArc Formation

Page 15: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Circuit BreakerSchematics

Auto Trip Schematic

Spring Charging

Motor Schematic

Page 16: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerSwitchgear Assembly

Page 17: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerComponent Relationships

Page 18: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerRacking Mechanism

Power Shield

Racking Crank(Bar)

Position Indicator

Indicator Lights

480v Circuit

Breaker

Shutter Door

Indicator Lights

Page 19: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerPositions

Breaker Position Label

Page 20: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerSwitchgear Cubicle

Primary Contacts(Stabs)

Grounding Strap

Secondary Contacts(Auxiliary)

Tagged Stabs

Unprotected Stabs

Current Transformer

Grounding Strap

Page 21: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerRear of Cabinet

Fuse Block

Terminal Strip

Typical Tagging Point

Page 22: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit Breaker(Front)

Power Shield Arc Chutes

Manual Trip Pushbutton

Manual Electrical Close Pushbutton

Charging Motor Switch

Auto Trip Indicator/Reset

Tagging &Lock Hasp

Racking Shutter (Door)

Open/Close Indicator

Closing Spring Charge

Indicator

Manual Close Lever

Auxiliary Switches

Page 23: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit Breaker(Back)

Primary Contacts(Stabs)

Secondary Contacts(Auxiliary)

Charging Spring Motor

Ground

Primary & Secondary CT’s for Powershield

Page 24: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerSwitchgear Assembly

Movable Arcing

Contact

Movable Main

Contact

Stationary Arcing

Contact

Stationary Main

Contact

Page 25: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerMetal & Insulated Arc Chutes

Page 26: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerTrip Schematic

Page 27: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 480v Circuit BreakerSchematic

Page 28: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Ground Truck

Page 29: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Ground Truck

DoorDoor

Connections for grounding

cables

Connections for grounding

cables

Grounding cables

Page 30: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Ground Truck Chassis

Racking Mechanism

Primary Contacts

Ground

Racking Mechanism

5th Wheel Fitting

Racking Mechanism

Page 31: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Pot Fuses

Trip String Relays

Drawers

Terminal Strip

Rotary Switch

Undervoltage Knife

Switches

Agastat Time Delay Relay

Page 32: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical 4160v Pot Fuses

Pot Fuse Clips

Power Control Secondary

Connection broken when

door is opened

Ground

Page 33: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical Motor Control Center

Page 34: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical AC Motor Control Center

Slide Switch

Term Board

Rotary Switch

Thermal Overload

Reset

Fuses

Transducer

Auxiliary Contact

RelayAuxiliary Contact

Fuses

Thermal Overload

Reset

Thermal Overload

Reset

Page 35: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical DC Motor Control Center

Term Board

Auxiliary Contact

Page 36: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical Motor Control Center

Term Board

Auxiliary Contact

Relay

Rotary Switch

Rotary Switch Connections

(fingers)

Page 37: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Typical Motor Control Center

Term Board

Auxiliary Contact

Slide Switch

Slide Switch Connections

(fingers)

Slide Switch Connections

(fingers)

Page 38: ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material 1.3.7.21.3.7.42.1.14.15.1.1.1.1.15.1.1.2.1.3

Safety Equipment

Voltage check

‘Rocket’


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