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 FIGURE 9-7. Meter Nameplate
straight line accuracy up to 20 amps and also use with CTs with 5 amp
secondaries. Class 10 and 20 meters are for use with instrument transformers
only . Class 100, 200, and 320 meters are designed to directly meter the line
current.
Class
10: 2.5-amp meter with 400 percent overload capability
20: 2.5-amp meter with 800 percent overload capability
Class
Class
100: 15-amp meter with 400 percent overload capability
200: 30-amp meter with 666-2/3 percent overload capability
Class
320: 50-amp meter with 640 percent overload capability
Class
There are some exceptions to the rule. Refer to manufacturers instructions
to be sure of the correct application for a particular meter.
2.1.6.2 Register Multiplier (Kr). To obtain the correct number of
kilowatthours, it may be necessary to multiply the value shown on the q eter by
a register multiplier or register constant Kr. The value of Kr, although
shown on the meter nameplate, can be calculated as follows:
R r x Kh x T F x Gr
Kr =
10,000
9-15
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