What is the required proof test percentage for capacity after structural repairs or alterations of a personnel hoisting platform?

After structural repairs or alterations of a personnel hoisting platform, a proof test is mandated to ensure the platform meets safety and operational integrity standards. The required proof test percentage for capacity is established at 150%. This percentage is crucial because it provides an additional safety factor beyond the normal working load, allowing for any potential weaknesses introduced during repairs or modifications.

A proof test at this level helps to validate the structural strength and reliability of the platform before it is used in actual operations. It is a standard practice in the industry to ensure that any repairs or changes to the hoisting platform do not compromise its ability to safely support personnel and equipment.

While lower proof test percentages may be acceptable in other contexts, they do not provide the necessary assurance required after significant changes are made. Hence, a proof test percentage of 150% is essential for safeguarding against failure and ensuring compliance with industry safety standards.