12.) The spaces about electrical equipment.
A number of concerns relating to the clearance issues of Section 110.26 are often overlooked in the field. This section requires that sufficient access and working space be provided about electrical equipment to provide ready and safe operation and maintenance of the equipment.
The depth of working space described in Section 110.26(A)(1) is required about equipment operating at 600 volts or less to ground that may require examination, adjustment, servicing, or maintenance while energized. The depth of the space must be determined in accordance with Table 110.26(A)(1) which is based on the conditions described in the table note.
Section 110.26(A)(2) "Width of Working Space" requires the working space to be at least 30 inches in width or the width of the equipment whichever is greater. This section further requires that the space permit the door or hinged panel of the equipment to open at least 90 degrees.
Section 110-26(A)(3) "Height of Working Space" requires the height of the working space to be at least 6 feet 6 inches, measured from the floor, grade, or platform, or the actual height of the equipment itself which ever is greater. Associated equipment that is located within the working space is not permitted to extend more than 6 inches beyond the front of the electrical equipment.
Section 110.26(B) "Clear Spaces" requires that space about electrical equipment be kept clear and by not allowing the space to be used for storage.
Section 110.26(F) "Dedicated Equipment Space" requires that switchboards, panelboards, distribution boards, and motor control centers be located in dedicated spaces and be protected from damage. Section 110.26(F)(1)(a) mandates a clear space that is the depth and width of the equipment that extends to height of 6 feet above the equipment or the structural ceiling which ever is lower. Revised for the 2002 NEC it is now clear that only equipment associated with the electrical installation is permitted in this space. Where the structural ceiling height is greater than 6 feet, foreign systems are allowed above the six foot space as long as protection from leaks, breaks or condensation has been provided.