Lifting at work is all about risk assessment � not an absolute lifting limit.
If you have concerns about lifting you are being asked to undertake at work, you should bring this to the attention of your superiors.
The risk assessment will include the weight being lifted, the stature of the person doing the lifting, plus other factors such as the size of object being lifted/moved and how it is being moved (involving stretching, reaching, carrying for any distance etc).
The purpose of the risk assessment is to minimise the risk of injury � those conducting the lifting should be integral to the risk assessment and fully understand what actions/assessment they must make before undertaking any lifting activity.
The risk assessment is very important to your employer, having one will assist them in any defence against an injury claim resulting from lifting � not having one will significantly impair any defence.