39 Siemens Industry, Inc.
Current Transformer Basics
Ensure CTs meet the following criteria:
▪ 600 Vac UL Rated
▪ UL2808 Listed
▪ 1/3 (333 mV) output voltage
▪ Appropriate range for the circuit (5-120% of CT rating recommended)
▪ Read the label.
Ensure CT orientation and placement:
▪ Arrow points toward load (or as instructed by CT label).
▪ Arrow points away from Panel (or as instructed by CT label).
▪ Placed on First Conductor of voltage Reference (L1-L2) circuits are
placed on L1.
▪ Observe wiring color and polarity.
▪ Use the Shield wire if provided (connect to PCB terminal marked S).
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