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(A) Dimensions
Rectangular access openings shall not be less than 650 mm × 550 mm (26 in. × 22 in.). Round access openings in a manhole shall be not less than 650 mm (26 in.) in diameter.
Exception: A manhole that has a fixed ladder that does not obstruct the opening or that contains only one or more of the following shall be permitted to reduce the minimum cover diameter to 600 mm (2 ft):
  1. Optical fiber cables as covered in Article 770
  2. Power-limited fire alarm circuits supplied in accordance with 760.121
  3. Class 2 or Class 3 remote-control and signaling circuits, or both, supplied in accordance with 725.121
(B) Obstructions
Manhole openings shall be free of protrusions that could injure personnel or prevent ready egress.
(C) Location
Manhole openings for personnel shall be located where they are not directly above electrical equipment or conductors in the enclosure. Where this is not practicable, either a protective barrier or a fixed ladder shall be provided.
(D) Covers
Covers shall be over 45 kg (100 lb) or otherwise designed to require the use of tools to open. They shall be designed or restrained so they cannot fall into the manhole or protrude sufficiently to contact electrical conductors or equipment within the manhole.
(E) Marking
Manhole covers shall have an identifying mark or logo that prominently indicates their function, such as "electric."

Related Code Sections

110.75 General, Access to Manholes
Rectangular access openings shall not be less than 650 mm × 550 mm (26 in. × 22 in.). Round access openings in a manhole shall be not less than 650 ...
110.75 General, Access to Manholes
Rectangular access openings shall not be less than 650 mm × 550 mm (26 in. × 22 in.). Round access openings in a manhole shall be not less than 650 ...
(B) General, Obstructions
Manhole openings shall be free of protrusions that could injure personnel or prevent ready egress ...
(C) General, Location
Manhole openings for personnel shall be located where they are not directly above electrical equipment or conductors in the enclosure. Where ...
(C) General, Location
Manhole openings for personnel shall be located where they are not directly above electrical equipment or conductors in the enclosure. Where ...