When is it considered safe to check the tension of the belts on a hydraulic elevator?

Checking the tension of the belts on a hydraulic elevator is considered safe after locking out and tagging out the mainline. This procedure is essential for ensuring the safety of personnel while performing maintenance or inspections. Lockout/tagout (LOTO) is a critical safety practice that involves disabling the elevator's power source and ensuring that it cannot be inadvertently re-energized while maintenance is being conducted. It protects workers from the risk of electric shock or mechanical movement, which could lead to injuries during the tension check.

When the mainline is locked out and tagged out, proper safety protocols are in place, allowing for a thorough and safe inspection of the belts. Other choices do not adequately address the safety measures required in this scenario, as checking tension without proper lockout could expose maintenance personnel to potential hazards.