Question: Why are solid core current transformers color coded (black & white, red & white, and blue & white)?

Tim Law

New member
Answer: Industry convention for color coding in 3 Phase 208V electrical systems assigns the color black to phase A, red to phase B, Blue to phase C, and white to Neutral. Leviton‘s 100A and 200A solid core CTs are coded with the same colors (on the body of the CTs and on the wires) to help installers get each CT placed on the correct hot leg. Further, the white half of the CT always faces incoming Line or source. Phase A CT (black) connects to CT1 at the meter, phase B CT (Red) connects to CT2, and phase C CT (blue) connects to CT3. See hookup diagrams in figures 8 and 9.