Since it is regulated power, is it safe to connect the Arduino 5V directly to V+ on the supply and GND to -5V, bypassing Vin?
Do I need EMC filtering, or is that overkill? Is it required for FCC? If so, I am having trouble finding a suitable 120V Common Mode Choke (NF on the circuit schematic).
If I use the EMC, I will have a chassis ground. Should I just run that back to the origin of the ground on the pcb to avoid ground loop? Can -5V touch this?
I didn't realize implementing this would raise so many questions. I wish I could just use a wall wart!
It's run off of a 240V circuit in the US, meaning I have 2 120V lines to split, but can only do that inside the panel. I would either have to include a 240V outlet and use a corresponding wall wart, which would be expensive. If I could pull just one leg into a junction and put an outlet on, that would work, but then it wouldn't be up to code given that it's a 240 breaker. The breaker would still work, but it wouldn't pass inspection.
The iPad charger is a good idea, but then I still have the issue of not being allowed to wire 240v to an outlet with the 120v configuration. I would have to use a 240v outlet, so would need an adaptor for the plug. Here's a outlet that would work http://www.stayonline.com/detail.aspx?id=4772, and I'm not sure if there is an approved adaptor to go between the two.
The Mean Well unit looks pretty good, and cheap. The transformer alone I wanted to use is $20. This really depends on the enclosure I will use. I wanted to shrink it and make only one electrical connection. I would need to make the junctions inside the panel, since again I would be splitting the 240V circuit. That could work if I find the right panel.