UFC 3 -520-01
June 10, 2002
installation located above or below the electrical equipment will be permitted to extend
not more than 152.4 millimeters (6 inches) beyond the front of the electrical equipment
(refer to Figure 8 -2). The intent of this requirement is to preclude the installation of
equipment, such as a transformer, in the working space for other electrical equipment,
such as a panelboard; this type of installation impedes access and can create an unsafe
Figure 8-2. Associated Equipment Maximum Extension into Work Space
8-1.2.6 Front Working Space. In all cases where there are energized parts normally
exposed on the front of switchboards or MCCs, provide a working space width in front of
such equipment not less than 0.9 meters (3 feet) or the width of the equipment,
whichever is greater . This exceeds the minimum space required by the NEC.
8-1.2.7 Clear Spaces. Do not use for storage or otherwise block working space
required for equipment operation and mai ntenance. Guard the working space when
normally enclosed energized parts are exposed for inspection or servicing, if in a
passageway or general open space.
8-1.2.8 Dedicated Equipment Space. The requirements for working space and
dedicated space are clo sely related. Working space is the area intended for use by
personnel. Dedicated space is the area intended for use by the equipment itself.
Provide dedicated space for switchboards, panelboards, and MCCs in accordance with
NEC Article 110.26(F ) (2002 E dition). Summarizing the NEC, dedicate the space equal
to the width and depth of the equipment and extending from the floor to a height of 1.8