Made this casing for a 5V 60A power supply that was needed outside.
The casing is design with falling rain in mind. The powersupply was mounted with ty-wraps on the back of a ledpanel and was left outside for 3 months without problems.
To allow some airflow for cooling the casing has: holes in bottom, a gap between the cap and the main part, room inside. The used power supply has a cooling fan. I used a thermometer to watch the temperature in the casing.
(And oh, current/voltage may be lethal, so think before you act. Using your common sense is always adviable. Ask professional advise when in doubt. Use at your own risk and act accountable. I'm not liable.)
I manual removed the 2 ribs on the left and right inside. Else the power supply wouldn't fit. Should have made a redesign, but didn't want to print it all over.