The work space shall be clear and extend from the grade, floor, or platform to a height of 2.0 m (61
ft) or the height of the equipment
, whichever is greater. Within the height requirements of this section, other equipment
or support structures, such as concrete pads, associated with the electrical installation and located above or below the electrical equipment
shall be permitted to extend not more than 150 mm (6 in.) beyond the front of the electrical equipment
Exception No. 1: On battery systems mounted on open racks, the top clearance shall comply with 480.10(D).
Exception No. 2: In existing dwelling units, service equipment or panelboards that do not exceed 200 amperes shall be permitted in spaces where the height of the working space is less than 2.0 m (61/2 ft).
Exception No. 3: Meters that are installed in meter sockets shall be permitted to extend beyond the other equipment. The meter socket shall be required to follow the rules of this section.