A PCBU must, as soon as possible after becoming aware of a notifiable event, notify WorkSafe NZ of that event, using the fastest means available. This includes by phone or email or other electronic means.
Once details of the event are communicated to WorkSafe NZ, WorkSafe NZ will tell the PCBU if they require written notification. WorkSafe NZ has forms for written notifications.
If they do not require written notification, WorkSafe NZ will acknowledge your notification and confirm that no further action is required.
PCBUs also have a duty to preserve the scene of a notifiable event except for enabling medical treatment, making the scene safe, removing a deceased person or at the direction of an Inspector or Police Officer.
More about what to do if a notifiable event occurs.