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ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material e
SESSIONS 27 and V Switchgear 480V Switchgear 480V Motor Control Centers
Rule of Thumb HP480V MCC HP480V Bus +250 HP4160V Bus
Hand out and review drawings: SD SD
Typical 4160v Switchgear Assembly
Typical 4160v Circuit Breaker Cubicle (Front) RelaysFuse Block Relays 4160v Circuit Breaker Indicator Lights
Typical 4160v Circuit Breaker Cubicle (Front) Fuse Block 52h Switch 52s Switch Typical Tagging Points
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
Typical 4160v Circuit Breaker Cubicle (Back) Current Transformer Current Transformer(s) Bus Bar(s) Maple Plug
Typical 4160v Circuit Breaker Racking Mechanism Racking Crank (Bar) Racking Crank (Bar) 4160v Circuit Breaker Switchgear Compartment Door Sliding Panel Unlock Lever
Typical 4160v Circuit Breaker (Front) Ground Charging Lever Closing Springs 5 th Wheel Fitting Charging Motor Switch Manual Trip Pushbutton Position Indicator Counter Racking Mechanism Manual Close Lever
Typical 4160v Circuit Breaker (Back) Primary Contacts (Stabs) Secondary Contacts (Auxiliary) Arc Chutes Ground Puffer(s)
Typical 4160v Circuit Breaker Movable & Stationary Contacts Puffer Movable Arcing Contact Movable Main Contact Stationary Arcing Contact Stationary Main Contact Normal Contact Wear
Typical 4160v Circuit Breaker Arc Formation
Typical 4160v Circuit Breaker Schematics Auto Trip Schematic Spring Charging Motor Schematic
Typical 480v Circuit Breaker Switchgear Assembly
Typical 480v Circuit Breaker Component Relationships
Typical 480v Circuit Breaker Racking Mechanism Power Shield Racking Crank (Bar) Position Indicator Indicator Lights 480v Circuit Breaker Shutter Door Indicator Lights
Typical 480v Circuit Breaker Positions Breaker Position Label
Typical 480v Circuit Breaker Switchgear Cubicle Primary Contacts (Stabs) Grounding Strap Secondary Contacts (Auxiliary) Tagged Stabs Unprotected Stabs Current Transformer Grounding Strap
Typical 480v Circuit Breaker Rear of Cabinet Fuse Block Terminal Strip Typical Tagging Point
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
Typical 480v Circuit Breaker (Back) Primary Contacts (Stabs) Secondary Contacts (Auxiliary) Charging Spring Motor Ground Primary & Secondary CT’s for Powershield
Typical 480v Circuit Breaker Switchgear Assembly Movable Arcing Contact Movable Main Contact Stationary Arcing Contact Stationary Main Contact
Typical 480v Circuit Breaker Metal & Insulated Arc Chutes
Typical 480v Circuit Breaker Trip Schematic
Typical 480v Circuit Breaker Schematic
Typical 4160v Ground Truck
Door Connections for grounding cables Grounding cables
Typical 4160v Ground Truck Chassis Racking Mechanism Primary Contacts Ground Racking Mechanism 5 th Wheel Fitting Racking Mechanism
Typical 4160v Pot Fuses Trip String Relays Drawers Terminal Strip Rotary Switch Undervoltage Knife Switches Agastat Time Delay Relay
Typical 4160v Pot Fuses Pot Fuse Clips Power Control Secondary Connection broken when door is opened Ground
Typical Motor Control Center
Typical AC Motor Control Center Slide Switch Term Board Rotary Switch Thermal Overload Reset Fuses Transducer Auxiliary Contact Relay Auxiliary Contact Fuses Thermal Overload Reset
Typical DC Motor Control Center Term Board Auxiliary Contact
Typical Motor Control Center Term Board Auxiliary Contact Relay Rotary Switch Rotary Switch Connections (fingers)
Typical Motor Control Center Term Board Auxiliary Contact Slide Switch Slide Switch Connections (fingers)
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