Manhole


Manhole
PMG manhole in a city street, Perth, Western Australia.
Manhole in Belo Horizonte, Brazil.
This is a sewer manhole. Typically, only the top ring and manhole cover (not pictured) are visible.
Manhole cover of precast concrete in Germany

A manhole (alternatively utility hole, cable chamber, maintenance hole, inspection chamber, access chamber or confined space) is the top opening to an underground utility vault used to house an access point for making connections or performing maintenance on underground and buried public utility and other services including sewers, telephone, electricity, storm drains and gas. It is protected by a manhole cover, also known as a 'biscuit', a plug designed to prevent accidental or unauthorized access to the manhole. Those plugs are usually made of metal or constructed from precast concrete (especially in Europe). Manholes are usually outfitted with metal or polypropylene steps installed in the inner side of the wall to allow easy descent into the manhole.

Manholes are generally found in urban areas, in streets and occasionally under sidewalks. They are usually in circular shape to prevent accidental fall of the cover in the hole.

In rural and undeveloped areas, services such as telephone and electricity may be carried on pylons rather than underground.

Contents

Hazards caused by stray voltage in manholes

In urban areas, stray voltage issues have become a significant concern for utilities. In 2004, Jodie S. Lane was electrocuted after stepping on a metal manhole cover, while walking her dog in New York City.[1] One solution is the Electrified Cover Safeguard invention, which is an on site, real time stray voltage warning system which is being used in the street lights in New York City and is also being tested by ConEd and other utilities and municipalities in England, Europe, and Japan.[citation needed]

Feminist issue with manhole name

In 1990, the city of Sacramento, California officially renamed all its manholes to "maintenance holes" out of concern for gender equality.[2] The name "maintenance hole" was selected because the term shares the same initials as the word "manhole", thereby eliminating the need to change the MH labels on the city's utility maps.

See also

Notes


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Look at other dictionaries:

  • Manhole — マンホール Type Seinen Genre Thriller Thèmes Bioterrorisme, Enquête policière Manga Auteur Tetsuya Tsutsui …   Wikipédia en Français

  • Manhole — Man hole , n. A hole through which a man may descend or creep into a drain, sewer, steam boiler, parts of machinery, etc., for cleaning or repairing. [1913 Webster] …   The Collaborative International Dictionary of English

  • manhole — (n.) also man hole, hole through which a person may pass, 1793, from MAN (Cf. man) (n.) + HOLE (Cf. hole) (n.) …   Etymology dictionary

  • manhole — ► NOUN ▪ a covered opening allowing access to a sewer or other underground structure …   English terms dictionary

  • manhole — [man′hōl΄] n. an opening, often with a cover, through which a person can enter a sewer, conduit, ship s tank, etc. for repair work or inspection …   English World dictionary

  • manhole — n. an open manhole * * * [ mænhəʊl] an open manhole …   Combinatory dictionary

  • manhole — UK [ˈmænˌhəʊl] / US [ˈmænˌhoʊl] noun [countable] Word forms manhole : singular manhole plural manholes a hole in the surface of a road or street, covered with a metal lid and used for entering an underground passage such as a sewer …   English dictionary

  • manhole — noun Manhole is used before these nouns: ↑cover …   Collocations dictionary

  • manhole — [[t]mæ̱nhoʊl[/t]] manholes N COUNT A manhole is a large hole in a road or path, covered by a metal plate that can be removed. Workers climb down through manholes when they want to examine or clean the drains …   English dictionary

  • manhole — noun Date: 1793 a hole through which one may go especially to gain access to an underground or enclosed structure …   New Collegiate Dictionary


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