Original General Order 128
Requirements For Supply Systems
34.2 Equipment in Manholes, Vaults, Rooms and Other Enclosures
Equipment shall be so arranged as to provide reasonable accessibility to personnel and working space for the safe operation, maintenance, and replacement of said equipment.
A. Fused Devices
Fused devices shall be so located that they are readily accessible and may be safely operated and re-fused and so that the blowing of the' fuse will not endanger persons.
B. Sectionalizing Switches
Sectionalizing switches shall be so located that they may be operated, maintained, or replaced from a readily and safely accessible place.
They shall be so installed that the center of the grip of the operating handle when in its highest position will not be more than 6½ feet above the floor or other standing surface. Switches with viewing windows shall be so installed that the center of the viewing window will be not more than 6½ feet above the floor or other standing surface.
Transformers operating at more than 600 volts, other than current and potential transformers and transformers which constitute a component part of other apparatus and which conform to the requirements of such apparatus, shall be readily accessible for operation, inspection, maintenance, and replacement.
Transformers shall be installed in such a manner as to permit safe operation, maintenance, or replacement of other equipment.