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Is it possible to measure the B phase current in a 3-Wire Delta system using a CM-2000 series meter?

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CM-2000 Series Meters

Metering Installation and Configuration

The CM-2000 does not support a 3 CT configuration for 3-Wire Delta systems. The B phase is calculated regardless of whether you use 2 CT's or 3 CT's on a CM-2000 connected to a 3-Wire Delta system.
The appropriate system type for a 3-Wire Delta system is type 30 which requires 2 PTs and 2 CTs.

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