Which layer of protection is needed to better use XL power distribution cabinet?

XL power distribution cabinet has a door. Its shell is made of steel plate, which can be used for switching power supply. One door of XL power distribution cabinet is convenient for our maintenance, and the route is open for maintenance. XL power distribution cabinet is equipped with contactor and thermal relay in addition to protection circuit, which is very convenient to use. The shell of XL power distribution cabinet is made of anti-corrosion material, which has been beaten by wind and rain!