
What is the Law?
Safety, Health and Welfare at Work Act, 2005 and Safety, Health and Welfare at Work (General Application) Regulations, 2007.
The legal obligations are set out in:
What are the Maximum Weights to be Lifted?

There are no longer any absolute weight limits – for the simple reason that there are too many other factors involved – these risk factors have already been covered.
Guideline Weights.
Key risk factors are:
However, this diagram indicates guideline weights for lifting and lowering for an adult male (fit and healthy) in the best working conditions. For a female all weights should be reduced by one third.
Twisting
If a lifting task includes twisting there is a considerable increase in the chance of injury.
Frequent Lifting or Lowering
These guideline weights assume up to 30 leisurely operations an hour – where the pace of work is not forced, there are adequate pauses to rest and the load is not held for any length of time.
The weights must be reduced if the operation is repeated more frequently
Tackling the Problem
Employers have to seriously look for ways of eliminating manual handling in all cases.
Provision of Mechanical Aids
Wherever practical they must be provided – they can be as simple as a sack trolley. Any necessary training in their use must be provided.
Read in full: Manual Handling Guidelines PDF document