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What is the purpose of a Fifth Jaw kit?

What is the purpose of a fifth jaw kit?

Product Line:
Metering Equipment

The Fifth Jaw is required for the watthour meter to accurately calculate the kW usage when the meter is used on a 120/208Vac, 1 Phase / 3 Wire system. The Fifth Jaw is connected to the system neutral. The kW used is calculated by summing the kW used by each phase to neutral.
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