WHSR - What does WHSR stand for? The Free Dictionary
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If there is no suspected contravention of the WHSA or WHSR the entry permit holder must give a PCBU at least 24 hours notice before visiting.
Where there is a suspected contravention of the WHSA or WHSR the entry permit holder can enter without notice but must advise the PCBU of their entry and the nature of the suspected contravention.
So in summary, a PCBU must become familiar with their responsibilities under the WHSA, WHSR and Codes.