In the diagram of the switchboard shown in the illustration, what is the purpose of the current transformers? EL-0003

Correct Answer: Option D — transform relatively high generator load current to low instrument input current for ammeters, wattmeters, and the power factor meter

Current transformers step down high generator load currents to safe, standardized low values (typically 5 amperes) for monitoring instruments like ammeters, wattmeters, and power factor meters. In accordance with IEEE 45 and 46 CFR Subchapter J, this isolation protects personnel and sensitive switchboard metering equipment from high primary system voltages and currents.