Meanwhile I had some time to take an American DJ power strip apart so that I can connect the outlets to a relays that I'll control later.
Basically take the two screws from each side;
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Take out the short black wires (N on the connectors):
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Change the short wires with long ones (18AWG):
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Make a hole and take out your leads:
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The relay boards will be connected to the controller via 10p ribbon cable.