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Z4000, Z1000 Bricks and Z750 Bricks Phasing

I have 2 Z4000 Transformers plugged into the same power Strip running one side of my layout on one TIU (will call A) with all 4 inputs wired. The TIU is auxiliary powered by a MTH Z500 Brick.

1. Do the 2 Z4000's need to be phased since they are plugged into the same power strip and can only be plugged in one way? I checked voltage between them after connecting the black terminals together and using volt meter between reds and voltage is NOT doubled but is exactly what is coming from red and black on each transformer (18v). This leads me to believe they are phased in sync.

On the other side of the room I have another layout with 3 Z1000 Bricks and one Z750 Brick plugged into a power strip connected to one TIU (will call B) with all 4 inputs wired. This TIU is auxiliary powered by a Z750 Brick.

2. Do these need to be phased. NOTE: I have a wire coming from one Z4000 over to one of the inputs on the other TIU (B) because the two layouts are connected by one loop. In a previous post it was discovered that this was needed as I was getting double voltage over the isolated section of track in the connecting loop.

3. If they need to be phased can the phasing be done at the TIU inputs rather than the transformer as the transformers are all barrel jacks into MTH Adapters at the TIU?

4. This is kinda a repeat question. Can I keep the wire from Layout 1 to layout 2  and also run a connecting wire between all the black inputs of TIU (A) and connect all  the black inputs of TIU (B)?

 

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