Introduction
This instruction bulletin contains direction for receiving, handling, storing, installing, operating, and maintaining Masterclad 5-15 kV metal-clad, drawout indoor switchgear that provides medium voltage power distribution. This equipment is manufactured by Schneider Electric. It is designed for use with Type VR drawout circuit breakers, which employ vacuum technology. The design accommodates one-high and/or two-high circuit breaker configurations on the top and/or bottom. Two auxiliary components can be substituted in place of each circuit breaker, including: voltage transformers, control power transformers, or primary fuses. A typical Masterclad switchgear assembly is shown in Typical Masterclad Metal-Clad Switchgear Assembly. The Type VR circuit breaker is shown in Type VR Circuit Breaker-Front and Rear Views.
Typical Masterclad Metal-Clad Switchgear Assembly
Type VR Circuit Breaker-Front and Rear Views
Refer to these instruction bulletins for complete information on the accessories available for this equipment:
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6055-31 (VR Vacuum Circuit Breaker–1200 A and 2000 A, 50 kA)
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6055-33 (VR Vacuum Circuit Breaker–3000 A, 50 kA and 1200 A, 2000 A, and 3000 A, 63 kA)
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6055-34 (Manual Ground and Test Devices)
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6055-36 (VR Electric Racking Device)
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6055-37 (VR Electrically Operated Ground and Test Device)
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6055-38 (VR Manual Ground and Test Device with Selector Switches)
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6055-54 (Lift Truck for VR Circuit Breakers)
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6055-60 (VR Electrically Operated Ground And Test Device)
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6055-62B (Addendum for Integrated Racking Mechanism)
The switchgear assembly (see Typical Masterclad Metal-Clad Switchgear Assembly) consists of individually grounded, compartmentalized, steel structures. Each compartment has doors, barriers, and removable access panels to isolate the separate working functions. All of the circuit breakers, instrument and control power transformers, relays, meters, and other components are factory assembled, wired, and tested as an assembly.
The installer normally makes only the external control, ground, and power connections at the terminals provided, and reconnects the wiring and bus bars at the shipping splits.
Each assembly is custom designed, with standard structures and bus configurations arranged according to customer specifications. The structures are then combined with the circuit breaker and other components necessary for the required protective scheme, metering, and number of feeders.
Complete customer drawings are furnished for each Masterclad switchgear assembly. The drawings include floor plans and elevations, one-line diagrams, bills of material, control schematics, and wiring diagrams.