480 V double-ended low-voltage switchgear
This double-ended low-voltage switchgear single line diagram shows two independent 13.8 kV sources transformed to separate 480 V bus sections. Each section has a 3200 A main breaker and supplies its own motor control center feeder. A normally open bus tie provides a planned transfer path when one source is unavailable.
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Scenario
An industrial plant uses independent transformer-fed sections so an outage can be isolated or one source can carry both buses through a controlled tie.
Key decisions
- Each 13.8 kV feeder has a dedicated 2000 kVA transformer.
- Both 480 V mains are rated 3200 A and 65 kA.
- The bus tie is normally open to avoid paralleling sources.
- Each bus supplies an independent 800 A MCC feeder.
When to reuse this
Use this topology for plants that need sectionalized low-voltage distribution. Interlocking and transformer capacity must be verified before closing the tie.
Frequently asked questions
Why is the bus tie normally open?
Can one transformer feed both buses?
What is an MCC feeder?
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