Every lifting appliance, every item of loose gear and every
sling or lifting device forming an integral part of a load shall be
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(a)
of good design and construction,
of adequate strength for the purpose for which it is used, maintained
in good repair and working order and, in the case of a lifting appliance
in respect of which this is necessary, properly installed;
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(b)
used in a safe and proper manner
and, in particular, shall not be loaded beyond its safe working load
or loads, except for testing purposes as specified and under the direction
of a competent person.