Hello! I would like to you use Shelly EM to monitor my apartment power consumption and I have a couple of questions.
1. Is it possible to connect clamp BEFORE main circuit breaker? My breaker box is rather small and only way I can fit clamp is before main contactor. You can check a picture in attachments.
2. Main breaker is 50A. Shoud I consider 50A clamp or it will be better to use 120A?
Hi
@Tualua , welcome to the forum. 
I don't have an EM myself, sorry.
Normaly, you shouldn't reach 50A in reality. Therefore, it shouldn't matter which one you take.
With the 120A-version, you are on safe side.
Hello Tualua
WELCOME TO THE FORUM
You can put the CT-clamp before or behind your main breaker. This makes no difference. I would recommend you to use a 50A CT. As 66er already stated in real you will/should never reach the 50A. Therfore the 50A-CT is sufficient and you will have a more precise measurement if the CT is operated within the last third of the measurement range than in the first third.
Thank you! Ordered EM and 50A clamp
