A permit-to-work is a formal written means of making sure that potentially dangerous jobs are approached and carried out using appropriate safety procedures.
hot work (welding, cutting, grinding, etc.),entry into a confined space, specified work on electrical equipment and Temporary works will all require Permits.
Check with your supervisor whether or not a permit-to-work is required for the work you have to do.
Make sure that the requirements of any permit that affects you have been explained to you.
Make sure you understand how they apply to your job.
When issued with a permit or when working under a permit, you should:
read it carefully
make sure you understand what action to take in an emergency
make sure you understand the limitations the permit places upon where you can work, what you can do and what equipment you can use
note for how long the permit is valid.
It must be clearly understood that the issue of a permit-to-work does not, by itself, make a job safe. This is achieved by the right application of the conditions specified on the permit.