Schneider Electric E4800

930-110-01-B.00 PowerLogicTM EM4800 Series

04/2011 Installation

Installing Potential Transformers for

Three-Phase Service Greater Than 277V Potential transformers are required when metering services greater than the

rated voltage input of the meter. Potential transformers are used to reduce

the line-to-neutral voltage of the service to 120V. The accuracy class should

be 0.3% or better, with a burden rating of 30VA.

For applications in Canada, Measurement Canada approved potential

transformers are required. Measurement Canada requires an accuracy class

of 0.3% or better, with a 150VA rating.

NOTE: Potential transformer burden depends on the control voltage

source. If control voltage is provided separately (not derived from the

metered voltage), then lower transformer burden may be acceptable.

Contact your local Schneider Electric representative for details.

Mount the potential transformer enclosure between the supply voltage and

the PowerLogic meters as shown in Figure 5. Transformer configuration

must be Y||Y (wye-wye).

In Figure 5, the meter is powered from the potential transformers that are fed

from a breaker within the 600Y/347V panel. The CT cable is connected to the

shorting enclosure before connecting to the CTs in the panel.