The absolute duty to fence dangerous machinery under s27 of the Factories, Shops & Industries Act 1962 is not negated by the impracticability of fencing, nor by the fact that the injured worker was an expert who chose his own method of work. An occupier who removes a guard from machinery, thereby inviting an expert worker to proceed without it, cannot rely on the worker's expertise to break the causal chain. An employer is not negligent in sending a highly skilled specialist to perform routine work without additional supervision or equipment where the risk arose from the occupier's removal of a guard.
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