Three-Phase Four-Wire Stinger
Three-Phase Two-Wire Corner Grounded Delta
(only 240 V-3 and 480 V-3)
Connect Current
Transformers
The current transformer must generate 333.33 millivolts AC at rated current. See the cur-
rent transformer data sheets for CT ratings.
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Do not use ratio or current output such as 1 amp or 5 amp output models!
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See the CT data sheets for the maximum input current ratings.
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Be careful to match the CTs with the voltage phases. Make sure the CT L1 is meas-
uring the current on the same phase being monitored by the L1 voltage input and
the same for phases L2 and L3. Use the supplied colored labels or colored tape to
identify the CT leads.
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To minimize current measurement noise, avoid extending the CT wires, especially in
noisy environments. If it is necessary to extend the wires, use twisted pair cable 22
to 14 AWG, rated for 300 V or 600 V (not less than the service voltage) and shielded
if possible
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Make sure the CTs face the correct direction. An arrow might indicate either the load
or the source (public grid)
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If you see strange readings on unused phases, jumper the unused CT inputs: for
each unused CT, connect a short cable from the terminal marked with a white dot to
the terminal marked with a black dot.
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