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A utility vault is an underground room providing access to subterranean public utility equipment, such as valves for water or natural gas pipes, or switchgear for electrical or telecommunications equipment.
Utility vaults are commonly constructed out of reinforced concrete boxes, poured cement or brick. Small ones are usually entered through a manhole or grate on the topside. Such vaults are considered confined spaces and can be hazardous to enter. Large utility vaults are similar to mechanical or electrical rooms in design and content.
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