Is it per NEC to have a door in front of a panel, i have an existing panel and a new wall going up in front of the panel. Can i place a door in front of the panel that can be opened for the 3'6" clearance in front of the panel needed. It is a 450a 480v panel. When the door is closed the space between the panel and back of door is 1'6". The door is wider than the panel.