The scenario
A facility requires a 208V three-phase panel with 18 circuits. Critical loads on phases A and B receive UPS-backed power, while non-critical loads on phase C remain utility-only.
What is in this drawing
Read the decisions behind it.
01
Separate utility-only and UPS-backed buses to avoid mixing critical and non-critical loads.
02
Use dedicated breakers on the UPS input and output plus individual 20A breakers for each of the 18 circuits.
03
Label each circuit by phase (A, B, C) and criticality for clear operation.
Use when designing or documenting a distribution panel with partial UPS backup, especially for data closets, server rooms, or commercial tenant panels.
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