Author Topic: 400 A home installation  (Read 2918 times)


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400 A home installation
« on: November 12, 2017, 01:04:44 PM »

My question is about the CTs location connected to the MTU (TED Pro Home).

My home electrical installation : 2 x 200 A lines coming from my energy provider.

Each line has 2 wires : 1 hot phase wire and 1 neutral phase wire.

Before my 3 electrical panels, I have a box containing three big connectors.

Connector 1, in : 2 hot wires, out : 3 hot wires going to the three electrical panels
Connector 2, in : 2 neutral wires, out : 3 neutral wires going to the three electrical panels
Connector 3, in : 2 ground wires, out : 3 ground wires going to the three electrical panels

Because I have 2 lines from my electrical provider, the first 200 A CT is not suitable to border the two hot wires and the second one is not suitable for the two neutral wires.

To try my TED Pro Home, I match the CTs to one of the two hot wires and to one of the two neutral wires. Hence, I guess I will measure only half the energy consumption.
In the Footprints frontpage/MTU calibration, I entered 2 in the "kW Adjust" field.

Is that okay?

Should I use Rogowski coils ? If yes, what will be the advantages?

Thank you to help me.


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Re: 400 A home installation
« Reply #1 on: November 13, 2017, 11:06:08 AM »
Hi tryphon,

The TED Pro Home MTU CT's are designed to go around the 2 hot lines (1 CT clamp per line) of a residential single phase service. I will include some links below that will explain the installation in more detail. I also included a link that shows the inside diameter of the CT's in case a slightly larger CT will help. 

Pro Home Installation Manual:
Installation video: (CT installation is the same on TED5000 and TED Pro Home)

CT clamp specifications:

You would need a MTU Pro RC in order to use the Regowski coils which are designed for 3 phase 2,000A and 5,000A services which would not be recommended for a typical residential install.

For troubleshooting or if you run into any questions please let us know by going to and fill in the requested information to submit a support ticket so we can work to resolve any issues that may arise ASAP and make sure we provide the right firmware for any updates requested or required.

Have a wonderful day!

TED Support