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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: SuggestionsPosted by JOHNR on: 11/21/2015

I can only offer a simple solution to this problem.
Decide on which row you wish to place digital services. I would also include anything that has a switched mode power supply because of the Y capacitor thing. Assume Row 1 will be used for digital services.
Assign the central sockets nos 3 and 4 on the top row as the feeder location for sockets each side.

In the top row connect sockets 1 and 2 to socket 3 using individual wiring. I use a flat Nordost speaker wire, single strand for this. On a 110 volt power system insulation should not be an issue here. Fit shrink down tubing if this makes you nervous.

Wire socket 4 to sockets 5 and 6 (Row 1) using dedicated wiring.

The incoming power feed is to be taken directly to the Row 1 socket 3. I use a USA supplied 30 amp rated cooker wire for this, cross linked polyethylene type (XLPE and 27 strand). Never use PVC insulation.

Repeat this for the second row.

Connect row 1 socket 3 to row 2 socket 3 and again for sockets 4.

Rather obviously this will be an elaborate Star system.

The principle is to force noise coming in off each socket to take the shortest route to the feeder cable using its own wire.
Also to avoid sharing of noise artifacts except on the main feeder cable.

I live in a condo and have to suffer 200 air conditioners, lifts, main water pumps and booster water pumps directly above my head.
I also use a 2kVA 230 volt/110-0-110 isolation transformer for safety and noise control.

The 100-0-100 emulates the USA system of using a single phase 9 to 15 kilovolt feeder into a pole mounted transformer, aka "open delta" where the 2 outer taps will provide 220 volts for larger loads. Explains why 110 volt power is always dirty because of the mixed loading giving weird phasing artifacts.

A CAUTION:
When using this type of power supply I would strongly advise against using a house ground.
You can become the prefect ground path for lightning and any surge on ANY building anywhere that is served by this external transformer.
We used these in the Caribbean cellular radio sites and well member such an incident. We always fitted a 100 Joule surge arrestor system and it blew this such that it turned everything inside the steel box into charcoal.

Use an isolating transformer always. - then decide upon your grounding method.

Hope this helps,
Regards
John

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