Control of Vibration at Work Regulations 2005

This requires employers to protect workers from risks to health from hand-arm and whole-body vibration. An item of machinery is typically allocated a certain number of points per unit time to represent its vibratory effect on an operator, with a maximum number of points being permitted per 8-hour working day. An example might be a compact tractor being rated as 16 PPH (points per hour), which would mean that an operator would reach the 100 daily points after using the machine for (100/16) 6.25 hours.