The meaning of 'Use' is covered under Regulation 2(1) of the regulations and states that this means that it is "any activity involving the work equipment which includes starting, stopping, programming, setting, transporting, repairing, modifying, maintaining, servicing, and cleaning" Therefore if you are using the machinery and you have an accident on this machine then you may have a claim under these regulations.
The regulations apply to employers who provide equipment to their employees at their work. Therefore if an employer gives someone a tool or piece of machinery with the intention of them using this in the course of their employment then, if there is a fault with the machine/tool, the employer will be liable under the legislation.
The legislation also applies to anyone who has control over any equipment, a person at work who is using or supervising the use of the equipment or has control of the way in which the equipment is used.