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Sure high risk activities which are particularly dangerous could require a permit to work. Examples of those actions embody work in confined area, excessive voltage electrical work, coping with hazardous substances resembling radioactive material or waste, working at height and tasks involving heavy equipment. Developed by the chemical trade but later adopted by companies in lots of different areas, a permit to work system ensures that certain duties are solely carried out as soon as stringent checks have been carried out and permission for the work to be undertaken has been signed off by a site manager.