Following a lockout/tagout procedure, a lockout certificate must be produced to allow teams to carry out operations (electrical or non-electrical work, interventions, etc.) on or in the vicinity of electrical installations and facilities.
This certificate differs depending on whether a one-step or two-step lockout procedure is performed. Mastery of the documents and procedures for accessing installations and facilities is a central topic in electrical authorization training.
1 – One-step lockout certificate
The lockout certificate serves to certify that the lockout supervisor has completed all lockout operations. It is drafted and signed by the lockout supervisor in two numbered copies: one kept by the author, the other handed over against signature to the work supervisor (authorized B2 B2V), the facility manager or the electrical operations manager. It can be handed over in person or transmitted remotely by verified message or equivalent means. Electronic signature solutions such as Yousign (soon Youtrust) can be used to secure and trace these exchanges in a compliant manner.
The date and time of the lockout must be specified without exception.
A work completion notice must be associated with it. Work interruption notices, successive handovers, or replacements of the lockout supervisor or work supervisor may also be associated with it.
Here is an example of a one-step lockout certificate according to the requirements of the NF C18-510 standard:


2 – Two-step lockout procedure
During a two-step lockout, a first-step lockout certificate is used. Its purpose is to:
- certify that the lockout supervisor has completed the first two lockout operations
- specify the remaining operations to be carried out by the work supervisor to complete the lockout
- flag any specific execution requirements
It is drafted and signed by the lockout supervisor in two numbered copies: one kept by the author, the other handed over against signature to the work supervisor. It can be handed over in person or transmitted remotely by message or equivalent means. The date and time of the lockout must be specified without exception. Similarly, a work completion notice must be associated with it. Work interruption notices, successive handovers, or replacements of the lockout supervisor or work supervisor may also be associated with it.
Here is an example of a first-step lockout certificate according to the requirements of the NF C18-510 standard:

