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Operating 2 supplies in parallel without isolating diodes works until one power supply output shorts out, then takes both supplies down..Isolating diodes should always be used or other method to isolate the 2 power supplies in case of failure

Any what to look out for situations for this, besides matching voltages?

I took an Astron SS-30M that was not switched on and back fed 5-18VDC from a metered regulated bench supply to it. With initial switch on at 13.8V from the bench supply, the? "on" current was 200mA that soon dropped to 10mA. The volt meter on the SS-30M then read 13.8V. SS-30M analog amp meter still at zero to the eye.

From that test , it appears that no isolating diodes from SS-30 power supplies to common output would be required, and as long as the output voltages are equal, both supplies should carry half of the required current. It seems it would be best would be to use SS-30M supplies so the equal current draws can be confirmed visually, but not really necessary if equal voltages stay equal.?

If available, is it significantly important or just preferred to connect both? supplies voltage sensing leads?? The SS-30 supplies? do not have externally reachable sense wires, but if really needed, they could be brought outside the case.

John