User Manual Chapter 2
GFK-2749A Jan 2020
Installation 28
Connection to Three-Phase Four-Wire WYE System with
Three PTs
The connections for a typical three-phase, four-wire system are shown below. The PTs are
selected to take the nominal line voltage down to the nominal 120VAC, or 600VAC that can
be processed by the Terminal Assembly/PSM system. Note that the additional scaling for
each CT and PT must be applied to all the results given by the PSM through the host
controller.
The primaries and secondaries of each potential transformer should be fused for maximum
protection. A fuse failure is an indication of wiring problems within the system.
Figure 13
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