PowerHawk 6212, 6312 and 6412 meters
930-108-01-A.04
Installation
01/2011
© 2011 Triacta Power Technologies All Rights Reserved
10
Installing Voltage Transformers for
Three-Phase Service Greater Than 120V
Voltage transformers are required when metering services greater than 120V
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 voltage
transformers are required. Measurement Canada requires an accuracy class
of 0.3% or better, with a 150VA rating.
NOTE: Voltage transformer burden depends on the control power
source. If control power is provided separately (not derived from the
metered voltage), then lower transformer burden may be acceptable.
Contact your local Triacta representative for details.
Voltage transformers must be mounted in a listed electrical enclosure. Mount
the voltage transformer enclosure between the supply voltage and the
PowerHawk 6212, 6312 and 6412 meters. Transformer configuration must
be Y||Y (wye-wye).
Figure 5 shows a voltage transformer chassis in a three-phase 277/480V
installation . Figure 6 shows a block diagram of a complete three-phase 480V
installation.
Figure 5: Voltage transformer chassis
To PowerHawk
From Breaker Panel
