Clearance: Electrical panels must be installed in a readily accessible area with a minimum clearance of 30 inches (762 mm) wide, 3 ft (36 inches or 914 mm) deep, and 6. 5 feet (≈ 2 meter) high in front of the panel. The panelboard's door (hinged cover) shall be able to be opened to a. Learn how to install a distribution box safely and correctly. Covers wiring, placement, standards, and expert tips for a compliant setup. Distribution box and switch box should not exceed 30 meters. Generally, distribution boxes can be divided into three levels of secondary protection, that is, three levels of distribution boxes: general. The IEC (International Electrotechnical Commission) and BS 7671 (British Standard for Electrical Installations) both provide essential requirements for electrical installations, including those for fuse boards like garage unit, consumer unit and distribution board. While the IEC 60364 standard. Wherever you may want to place your circuit box, you must follow the electrical panel mounting requirements dictated by the NEC (National Electrical Code). 26 in the 2014 National Electrical Code (NEC) contains specifications for the working space dimensions required around.