LOT/General/TBT-LOT-025
Multi-Lock Hasp and Group Isolation
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Toolbox Talk
Multi-Lock Hasp and Group Isolation
Multi-lock hasps allow several workers to apply their individual padlocks to a single isolation point. The hasp ensures the equipment cannot be re-energised until every person has removed their lock, confirming all work is complete and all personnel are clear. This talk covers the correct use of multi-lock hasps for group isolation on UK construction sites.
Key Hazards
Premature re-energisation if not all workers have applied their personal lock
Workers trapped inside equipment when a hasp is removed with people still working
Confusion over which lock belongs to whom when locks are not individually identifiable
Equipment restarted during shift handover when outgoing locks are removed too early
Control Measures
- Apply a multi-lock hasp to the isolation point when more than one person needs protection.
- Ensure every person working under the isolation applies their own uniquely keyed padlock to the hasp.
- Attach a completed danger tag to each lock with the owner's name, date, and task description.
- Do not remove the hasp until every individual padlock has been removed by its owner.
- Manage shift handover by having the incoming team apply their locks before the outgoing team removes theirs.
- Keep a written register of all locks applied to each hasp with names and expected completion times.
- Use a different coloured hasp or lock for each trade to aid visual identification on complex isolations.
- Brief all workers on the group isolation procedure and their personal lock responsibility.
- Never cut or remove another person's lock without a formal authorised lock removal procedure.
Remember
- Every person working under the isolation must apply their own personal padlock to the hasp
- The hasp cannot be removed until every individual padlock has been taken off by its owner
- During shift handover the incoming team must apply locks before the outgoing team removes theirs
- Never cut or remove another person's lock without following the formal authorised procedure
- Keep a written register of all locks on each hasp with names and expected completion times
Applicable Legislation: Electricity at Work Regulations 1989 · PUWER 1998 · Health and Safety at Work etc. Act 1974 · HSG85 (Electricity at Work: Safe Working Practices)
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