Under the Provision and Use of Work Equipment Regulations 1998 (PUWER), work equipment must be fitted with appropriate control systems, including emergency stop controls where necessary.
An emergency stop is required where it is appropriate to reduce risk. It must:
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Be clearly identifiable and easily accessible
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Bring the equipment to a safe condition as quickly as possible
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Take priority over other controls (e.g. normal stop/start controls)
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Not create additional hazards when activated
Not all equipment requires an emergency stop. The need depends on the risk assessment and the nature of the machinery. Where fitted, it must be maintained in effective working order and tested regularly.