I’ve got the same 200a panel as this installation: https://community.iotawatt.com/t/ct-installation-on-200a-siemens-panel/856. I’ve spent quite a bit of time researching in the forum but I still have some questions as I plan out the install.
The first challenge, as in the other post, are the mains. Here’s a pic looking up into the meter at the lines in from the city and the four mains out to the panel:
I think I have 3 not-ideal options for the mains:
- 2 CTs on the lines in from the city. There will some loss through the meter but it will be minimal?
- 4 CTs on the 2 black and 2 red mains. Probably no enough room to fit 4.
- 2 CTs on the 2 black and 2 red mains. I would need at least 30mm openings in the CTs.
The 400A CTs with 36mm openings are currently out of stock. Are there other CTs, perhaps from other suppliers, I could look at for option #3?
My other 2 questions are about breakers. The first is a breaker to the AC in the master bedroom addition. It has one red and one black, circled in yellow:
Normally in this situation I think I could use 1 CT and double the value. But in this case since there are 2 different sources do I need to use 2 CTs?
The second question is kinda the inverse. I have a subpanel near the pool for the pool pump and sweep. At the main panel 2 40a black wires go the subpanel, one to the pool pump and the other to the sweep:
From what I’ve read in the forums, normally when you have a subpanel you want to read both wires from the main panel. But in this case since both wires are black and I’m only interested in monitoring the pump, can I just put a CT on the wire to the pump-side of the sub panel?
Sorry if some of these questions are obvious. I’m a noob learning as I go. Thanks for the help!