What is the minimum mounting height for a panelboards, disconnect, or meter located in or on a building?
A3. The NEC does not mandate a minimum mounting height for panelboards, disconnects, or meter enclosures. But switches, and circuit breakers used as switches, shall be installed so the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than 6 ft 7 in. above the floor or working platform [404.8(A)]. Exception No. 2 permits switches and circuit breakers used as switches to be mounted higher than 6 ft 7 in. if they are located adjacent (next) to the equipment they supply and they are accessible by portable means. Note: 550.32(F) requires the outdoor mobile home disconnect to be installed so the bottom of the enclosure is not less than 2 ft above finished grade or working platform. Q4. How far can unfused service entrance conductors extend into a building? A4. Because service entrance conductors do not have short-circuit or ground-fault protection, their lengths must be severely restricted inside a building. Section 230.70
