What phase is the control power for the Energy Meter and Enercept Meter derived from?

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Issue
When installing the energy meter or Enercept meter which phase should control power be connected to?

Product Line
Energy Meter
Enercept Meter

Environment
Installation/Setup

Cause
There are three different phases that the control power can possibly be connected to

Resolution
*Warning: Installation and maintenance of this device should only be performed by qualified, competent personnel that have appropriate training and experience with high voltage and current devices. Failure to follow the instructions / warnings in the Meter Installation Guide can result in permanent damage to the meter, severe injury or death.

Energy Meter:
Control Power voltage is derived from Phase A to Neutral.
The Energy Meter (Basic and Extended Range model) is designed to monitor single or 3 phase wye connected configration. It does not support delta systems.

Enercept Meter:
Control Power voltage is derived from Phase A to Neutral. If there is no Neutral, the voltage is derived from Line to Line (Phase A to B).