As applied to mechanical guarding means that the moving parts are so guarded that physical contact by parts of the body is precluded as long as the guard remains in place. This does not prohibit the use of hinged, sliding, or otherwise removable doors or sections to permit inspection or lubrication.

Source: Petroleum Safety Orders–Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations

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