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The depth of the working space for energized equipment is described in Section 110.26(A)(1), based on three conditions:
These three conditions are defined in terms of what is on opposite sides of the working space, but they may be thought of in this way:There would be exposed live parts in front of the worker and no live or grounded parts behind. There would be exposed live parts in front and parts considered to be grounded behind the worker. There would be exposed live parts both in front of and behind the worker.
In some cases, a facility may establish a rule that prohibits live parts from being exposed on both sides of a work space or that requires an insulated barrier be temporarily placed behind a person who is working on live parts. However, these conditions are not usually part of the installation itself. So for the most part, locations that have any combination of panelboards, switchboards, or MCCs on both sides of the workspace are considered to be Condition 3. This assumption is clear in the special rule for existing buildings in Section 110.26(A)(1)(c).
© Hughes Associates,Inc. 2012