(2) Width of Working Space. The width of the working spacein front of the electrical equipment shall be the width of the
equipment or 762 mm (30 in.), whichever is greater. In all
cases, the work space shall permit at least a 90 degree opening
of equipment doors or hinged panels.
Regardless of the width of the electrical equipment, the working
space cannot be less than 30 inches wide as required by
Table 110.26(A)(1). This space allows an individual to have at least
shoulder-width space in front of the equipment. The 30-inch measurement
can be made from either the left or the right edge of the
equipment and can overlap other electrical equipment, provided
the other equipment does not extend beyond the clearance
required by Table 110.26(A)(1). If the equipment is wider than
30 inches, the left-to-right space must be equal to the width of the
equipment. Exhibit 110.15 illustrates the 30-inch width
requirement.
Sufficient depth in the working space is also required to
allow a panel or a door to open at least 90 degrees. If doors or
hinged panels are wider than 3 feet, more than a 3-foot deep
working space must be provided to allow a full 90-degree opening.
(See Exhibit 110.16.)