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A clear work space not less than 900 mm (3 ft) wide shall be provided where cables are located on both sides, and not less than 750 mm (21/2 ft) where cables are only on one side. The vertical headroom shall be not less than 1.8 m (6 ft) unless the opening is within 300 mm (1 ft), measured horizontally, of the adjacent interior side wall of the enclosure.
Exception: A manhole containing only one or more of the following shall be permitted to have one of the horizontal work space dimensions reduced to 600 mm (2 ft) where the other horizontal clear work space is increased so the sum of the two dimensions is not less than 1.8 m (6 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

Related Code Sections

110.72 General, Cabling Work Space
A clear work space not less than 900 mm (3 ft) wide shall be provided where cables are located on both sides, and not less than 750 mm (21/2 ft ...
110.72 General, Cabling Work Space
A clear work space not less than 900 mm (3 ft) wide shall be provided where cables are located on both sides, and not less than 750 mm (21/2 ft ...
334.15 Wiring Methods and Materials, Exposed Work
In exposed work, except as provided in 300.11(B), cable shall be installed as specified in 334.15(A) through (C ...