Method Of Use
Lock out boxes form part of safe systems of work, they are used to store isolation lock keys, fuses etc, that have been used to form an isolation and the following is an outline procedure for the use of the system.

When an isolation is carried out the isolation lock keys are placed in the lock out box, the box is locked by the duly authorised person using the control key.
When the persons who are carrying out the work sign the permit to work they will be issued with Key A. If a second permit to work is issued to someone else to work on the same item of plant they will be issued with Key B.
The safety features are until both the A and B keys are returned to the lock out box along with the duly authorised persons control key the lock out box cannot be opened by any of the individuals involved.

This is a very brief example of how a safe system of work operates.
Further information is available from Barry Brothers.

Key Safes
Manufactured to CEGB standard 13523 to provide for the safe retention of keys or other means used for isolating or 'locking off', in accordance with the CEGB Safety Rules.

Design
The key safe locking system operates in accordance with the following requirements:
 

1. The control key can be withdrawn in the locked unlocked positions.
2. Secondary Lock Keys can only be removed in the locked position.
3. Lock mechanisms are independant of each other.
4. The Key safe is secure until all keys are in the unlocked position.
5. Control locks and keys are alike within a key control area.
6. Secondary locks and keys differ win a key control area.

Construction
Key safes are of single or multiple units, which can be close mounted together. The box and door are constructed from 1.2mm thick mild steel, using a hinge pin 3.15mm diameter, secured to prevent withdrawal. The door is fitted with clear plastic 3mm thick, arranged to permit entry by breaking. All safes have one control lock either four or seven secondary locks. All locks are identified on the door of the safe together with the safe number. All keys are provided with brass tags engraved with the safe number and secondary lock identification.