Because the standards for installation in RV's are not as developed as they are for boats a lot of people use the boating standards as a reference. The basic principles are the same. ABYC requires that this panel be installed in an area where a tool (like a screwdriver) is required to get access to the back of it. That means it wouldn't be possible to inadvertently open a locker and come across any bare connections. A back is required if the panel shares an area with a DC wiring meaning that if you open up the wiring compartment to work on the DC wiring you cannot come in contact with any of the AC wiring. A back is available for this panel, it is part number 4027. The chassis of the vehicle should be connected to the AC ground. Wires should be harnessed within 18" of the panel.