I want to use 5 step down converters (220 VAC -> 5V DC) inside an enclosure inside an enclosure (double isolation).
The step down converters are similar to these. There will be 5 of them, where one is connected to an RS485 transceiver (MAX1485CPA), and the other 4 have each an optocoupler (6N137) and RS485 transceiver (MAX1485CPA).
The inner enclosure is completely closed, plastic, and just big enough to contain them with about 1 cm / 0.4" space between each converter.
In the outer enclosure (also plastic) will only be XLR (DMX) connectors and max. 10 small LED lights.
Also I will use a fuse (1A?) for safety.
- Will heat be an issue? If so, should I make 'holes' in both enclosures for air flow?
- As you can see I cannot screw the devices in an enclosure (no holes), so I want to glue them (upside down with the yellow flat area glued for a maximum and a flat glue area). Besides that, I'm intending to use wooden popsicle sticks to 'physically' make sure they never can touch each other (by glueing them somehow between the converters. Is there a problem or better solution (without having to buy new converters)?
After a discussion it is best to use a switching supply with enclosure already around it (being an amateur):