Accidental start-up, or movement of a machine mechanism, can occur: • if control levers or buttons are bumped or knocked • if a short circuit of the control system occurs • when hydraulic or air pressure is released • when undoing retaining bolts. The word machine is derived from the Latin word machina. The modern meaning of the word is influenced due its specialized application in the military siege engines. They are also used in the stage engines, which are used in theater.
Many different types of machinery and equipment use high integrity safety systems that disable a mechanism at the time of access. Some examples include: • brake press • power press • robotic machine (automated machines) • injection moulders • powered guillotines • programmable lathe and milling equipment • industrial mixers • mincing equipment • plasma cutting tables • laser cutting tables.
People performing these tasks must be provided with the means to get themselves and any equipment they require onto the roof with no risk, or minimal risk of fall or injury.
Larger machinery and equipment may contain internal areas where a hazardous environment may occur by design, or as a result of the work being done. A confined space may exist where people require access to a mostly closed area that presents difficult or restricted path of access, where oxygen levels may be depleted or displaced, or where harmful levels of contaminate, such as gas, vapour or dust, exist.
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