This part of ISO11680 specifies safety requirements, and the verification of those requirements,for the design,fabrication and use of portable, hand-held, pole-mounted powered pruners with a back- pack power unit,using a drive shaft to transmit power to cutting attachments. The cutting attachments covered are saw chains, and reciprocating and circular saw blades. This part of ISO11680 describes methods for the elimination or reduction ofhazards arising from their use. In addition it specifies the type of information on safe working practices to be provided by the manufacturer.It does not cover the risk of electric shock from overhead electric power lines during use of the pruners, with the exception of warnings advice intended for inclusion in instruction handbooks. A test method and safety requirements addressing this risk are yet to be developed. The list of significant hazards which require action to reduce the risk is given in annex A. Environmental aspects have not been considered This part of ISO11680 applies primarily to pruners manufactured after its date of issue.