Working in confined spaces involves higher risks. You must never work in these areas alone. As you have very limited freedom of movement, little to no light and limited possibilities for escape, proper preparation and clear agreements in advance are required.
Never enter a confined spaces without the client's permission.
Always ensure security is present at the entrance.
Ensure monitoring is performed as required.
Also carry out continuous monitoring for welding work.
Only work with safe electrical currents.
Ensure appropriate rescue, protection and communication equipment is available.