Posted By martin gray1 Hi everyone I know this may sound stupid but if I don't ask I wont know. Could someone explain in plain English the difference between exposure action level and exposure limit value. I can understand the action level it speaks for itself, it's the limit value I am not sure of the understanding. I have gone right through the hse website and can understand everything I am reading except this one point. Would really appreciate some advise. Many Thanks MG

Posted By Martyn Hendrie Above the action level (2.5 metres per second squared averaged over an 8 hour shift) there is a requirement for a risk assessment and reduction of risk using the hierarchy of control. You are not allowed to expose any worker above the limit value (5.0 metres per second squared averaged over an 8 hour shift). As far as I am aware each day (shift) is calculated in isolation and one vibration free day cannot be offset against a day with a lot of vibration work. Hope this helps. PS The HSE Vibration Calculator is excellent. Martyn

Posted By Richard Webber Martin, The action level (2.5 m/s² and up) is the level at which harm is possible and at which employers must examine all aspects of work activity to determine if there is any way that exposure to vibration could be reduced. This may include immediate remedies such as use of dampers, or long term remedies such as finding a new jig that allows the work to be done without the need for a person to hold a vibrating tool. The action level allows flexibility in the approach that the employer takes and would recognise for instance a purchasing strategy as being legitimate action. The limit value (5 m/s² and up) is the vibration level at which harm becomes likely and is related to time, i.e. trigger times decrease as vibration energy levels increase. Employers must ensure that employees are protected from harmful vibration levels by reducing vibration levels or limiting trigger time. This may be achieved by using equipment that vibrates less, limiting the time that an individual uses vibrating tools (trigger time), changing the work process to remove/reduce vibration etc. Hope that this helps Richard