General Requirements

600 Volts, nominal, or less [1910.303(g)]

1910.303(g)(2)(i)(A) By location in a room, vault, or similar
enclosure that is accessible only to qualified persons.
1910.303(g)(2)(i)(B) By suitable permanent, substantial partitions
or screens so arranged that only qualified persons will have access
to the space within reach of the live parts. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them.
1910.303(g)(2)(i)(C) By location on a suitable balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons.
1910.303(g)(2)(i)(D) By elevation of 8 feet or more above the floor
or other working surface.
1910.303(g)(2)(i) Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by approved cabinets or other forms of approved enclosures, or by any of the following means: (See A, B, C, and D above)