How to calibrate properly Shelly 3EM with a neutral CT ?

Modified on Wed, 11 Jan 2023 at 02:13 PM

Update the Shelly 3EM device to fw 1.12, where the functionality for neutral CT is supported. Then proceed with the following steps:
1. Lock N to phase A, don’t unlock A clamp.

2. Choose to calibrate N from A

3. If calibration fails, reverse N and try again.

4. When calibration is successful, move N clamp to Neutral wire.