You suggest I try the power supply with a 2 pin power cord, and also don't ground the housing of the supply? I have RCBO's The 2 cameras that get the most interference, and get the power over the balun, are the closest to the DVR and power supply. About 10 meters I estimate. The other cameras are at least double the distance, hence I power feed them over a 2x1.5mm cable. They get minor interference when connected to the supply.
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