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.
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. 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.
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. 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.
- ^ Ramirez, Anthony (January 19, 2004). "East Village Woman Was Electrocuted on Street With Metal Plate, Medical Examiner Says". New York Times. http://www.nytimes.com/2004/01/19/nyregion/east-village-woman-was-electrocuted-street-with-metal-plate-medical-examiner.html. Retrieved 2009-12-03.
- ^ Reuters. "Manholes by Another Name". The New York Times, June 24, 1990. Accessed December 19, 2008.
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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