Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...the depth may be less. (d) Where surface or ground water is liable to enter manholes containing supply conductors, these shall be so arranged, if practicable, as to provide permanent drainage. Where drainage is into sewers, suitable traps shall be arranged to prevent entrance of sewer gas into manholes. 'Manholes shall have adequate ventilation to open air where this is practicable and can be arranged without permitting entrance into the manhole of surface water, and such ventilation shall always be provided where any opening exists from such chambers into subways entered by the public, as with some subway conduit systems. 293. Manhole Covers and Guards (a) Manholes and handholes, while not being worked in, shall be securely closed by covers of sufficient strength to sustain such mechanical loads as may reasonably be expected to be imposed upon them, and the arrangement shall be such that a tool or appliance is required for their opening or removal.. (b) Manhole openings shall be so arranged that when they are uncovered barrier or other suitable guards may be placed to effectively protect the opening. 294. Material, Size, and Finish of Ducts Duets used in underground systems of distribution for electrical supply and signal conductors shall be of such material, size, mechanical strength, and iinish as to facilitate the installation and maintenance of conductors or cables. 295. Installation of Conduits (cz) Duets should be suitably reinforced or be laid on suitable foundations of sufficient mechanical strength where necessary to protect them from settling and should be protected by concrete or other covering where necessary to prevent their disturbance by workmen when digging or by other causes. The distance between the top of the conduit covering and the pav...
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