What color are the CT secondary wires connected to the Envoy?

• A. Red and Black
• B. Blue and White
• C. Green and Yellow
• D. Orange and Gray

Answer: (B)

Blue and White. The CT secondary wires are the low‑voltage leads from the current transformer that connect to the Envoy, and Enphase specifies blue and white for these CT leads to keep them distinct from the high‑voltage AC conductors. Correct polarity between the two CT leads is important for accurate current measurement; reversing them can invert the measured signal. The other color pairings aren’t used for the Envoy’s CT secondary connection.