Final answer:CT metering is used in electrical services withhigh current demand, typically greater than 100 amperes. It steps down high currents for accurate measurement, and allows ammeters to have scaled readings, such as 20.0-A and 100-mA full-scale readings.Explanation:CT metering, or current transformer metering, is typically used in services rated for high electrical load demand. Current transformers are used to step down high currents to a lower, manageable value for meters to safely and accurately measure electrical current. CT metering is particularly crucial for high-demand services where direct measurement would be impractical or impossible due to the large currents involved.Specific applications where CT metering might be used include services where the current is:Greater than 100 amperes; orPresent in circuitry that supports high operating voltages.In the case of an ammeter, a CT would allow it to measure:A 20.0-A full-scale reading, providing a scaled output for meters to interpret.A 100-mA full-scale reading, which showcases the versatility of CTs to provide accurate measurements for both high and low current ranges.CTs are essential components in a variety of fields ranging fromindustrialapplications tocommercialenergy management systems. They ensure safety and accuracy in electrical metering by stepping down current levels to safer, measurable values....

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