When is a lockbox used?

A lockbox (also called a lockout box or group lockout box) is a safety device used in LOTO procedures where several technicians work on the same installation simultaneously. In this article we explain when to use a lockbox, how the procedure works, and why this is crucial for group lockout in accordance with NEN 3140 and the Arbowet (Dutch OSH legislation).

What exactly is a lockbox?

A lockbox is a lockable box in which you keep the keys of the main lock or main switch during the work. Everyone working on the installation hangs their personal LOTO safety lock on the lockbox. The installation can only be put back into operation once everyone has removed their lock. This prevents a technician from starting up the installation while a colleague is still working elsewhere.

When do you use a lockbox?

A lockbox is used when:

  • Several technicians or disciplines work on the same installation simultaneously — for example during a major maintenance shutdown where electrical, mechanical and instrumentation technicians work together
  • There is one main switch for the entire system — but several people want to lock out on it
  • The key has to be placed in custody instead of remaining with one person (e.g. during a shift handover)
  • External contractors take part and all need to be able to apply their own lockout

The lockbox procedure step by step

A commonly used procedure runs as follows:

  1. Switch off and lock out: The installation is isolated. The main switch or valve is locked out with a LOTO safety padlock and fitted with a warning tag.
  2. Keys in the lockbox: The keys of all locked switches and valves go into the lockbox. The lockbox is then closed.
  3. Personal lock of each technician on the lockbox: Everyone who is going to carry out work places their own personal padlock on the lockbox. Optionally with a personal label.
  4. Try Out — verify that the installation is de-energised: Try to start the installation with the normal operating controls. If it doesn't start, the lockout has been carried out correctly.
  5. After the work: The installation can only be restarted once all personal safety locks have been removed from the lockbox. Only then can the lockbox be opened to retrieve the keys.

Why is this better than separate locks?

On a large installation you would, without a lockbox, have to place dozens of locks on a single switch — often physically impossible. A lockbox solves this:

  • Unlimited number of technicians — depending on the type of lockbox, up to 12+ personal locks can be applied
  • Keys not with one person — prevents a single technician who falls ill or leaves from keeping the entire installation locked
  • Clear overview — at a glance you see how many technicians are at work
  • Compliance — meets NEN 3140 guidelines for group lockout

Which lockbox suits your situation?

At LockOutStore.nl you will find various versions:

  • Standard lockbox — for 4-8 technicians, suitable for departments or smaller maintenance teams
  • Industrial lockbox — impact-resistant steel, suitable for harsh working conditions
  • Wall-mounted lockbox — for a fixed central location on the shop floor

View our range on the Lockboxes page or request a quote for custom solutions or larger quantities.

Combine with the right LOTO materials

A lockbox is one part of a complete LOTO procedure. For the full picture: