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Section 110.26 covers spaces for electrical equipment. It begins with a very general requirement for adequate access and enough working space to permit ready and safe operation and maintenance of all electrical equipment.
In some cases, this space may be minimal, just enough to allow a worker to replace, maintain, lubricate, examine or otherwise service equipment.
The general requirements apply to equipment that will be serviced only after it has been de-energized.
If the equipment will be serviced, maintained, examined or adjusted while energized, then the applicable section is 110.26(A), in which Subsections (1), (2) and (3) describe required minimum dimensions for a three-dimensional space.
“Equipment” includes nearly all parts of an electrical installation. Article 100 defines equipment as: “A general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation.” However, not all equipment is subject to any kind of maintenance or service. For example, the contents of a junction box may require examination at some point, but individual conduit or cable fittings or equipment that simply supports boxes and conduits would usually not require any maintenance after installation.
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