Key safes are used to retain keys safely (or other means) that are used to isolate or ''lock off'' in accordance with C.E.G.B safety rules.
Key safes form a part a safe system of work, a brief example of this is demonstrated below.
> In the event of a maintenance or outage order being issued, the equipment must be isolated.
> The Senior Authorised Person (SAP) will lock the keys in the nominated key safe, once the equipment has been isolated. The SAP will hold the control key, which is common for all key safes in the area.
> A permit to work will be issued to the first engineer that is required to work on the equipment that has been isolated. This engineer will also be issued with a secondary Key A from the nominated key safe. The following engineer that is required to work will be issued with Key B, and so on and so forth. The keys will be returned once all work has been completed and work permits will be signed off. It is only after all of the secondary keys have been returned and work permits have been signed off that the key safe can be opened. The SAP can then open the key safe and release the keys, remove the isolation lock and get the equipment back up and running.