Medium-Voltage Switchgear Selection Inputs: System, Protection, Environment, and Documentation

Medium-voltage switchgear selection is a system decision involving voltage, load, fault information, switching duty, protection, grounding, environment, access, and project standards. It should not be reduced to choosing a cabinet from a catalog.

Define the system

Record the approved one-line, voltage, frequency, load, feeder arrangement, switching duty, grounding, fault study, protection philosophy, metering, control, communication, and maintenance requirements. Identify who owns protection settings and the system study.

Environment and interface inputs

Capture indoor or outdoor location, temperature, humidity, dust, corrosion, altitude, access, cable entry, mounting, service clearance, and auxiliary power. Confirm the selected design’s required documentation and evidence for the final configuration.

Selection checklist

1. One-line, voltage, load, fault, grounding, and switching inputs.
2. Protection, metering, control, communication, and auxiliary power.
3. Environment, cable, mounting, access, and maintenance.
4. Drawings, manuals, labels, records, and approval responsibility.

Do not publish specific voltage, short-circuit, arc, or certification claims without model-level evidence and engineering review.