Dear jraef,
I have no idea about UL or NEMA but as per CE there is no restriction on the width of electrical cabinet door. Their only requirement is that the main power should be isolated as soon as somebody opens the door. We are using electrical door safety switches and tripping the main...
Dear Yaya,
IP 41 should not be a problem if use are using it absolutely inside.
All the standard manufacturers has got their prototype boards tested with National Laboratories for the parameters like IP rating and short circuit withstand capacity. You may ask your supplier to submitt those...