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930-134-01-A.00 PowerLogic
TM
Series EM4000
11/2013 Installation Guide
©2013 Schneider Electric All Rights Reserved 9
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 4. Transformer configuration must be Y||Y
(wye-wye).
In Figure 4, 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.