**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**