After any structural repair or modification, a personnel lifting platform shall be tested to what percentage of the platform rating?

When a personnel lifting platform undergoes any structural repair or modification, it is essential to test the platform to ensure its safety and reliability. Testing to 150% of the platform's rated capacity is a standard practice as it serves to confirm that the modifications have not compromised the structural integrity or functionality of the platform. This testing percentage also accounts for any potential unforeseen loads that could be applied in real-world scenarios, ensuring an additional margin of safety.

Testing at 150% means that the platform will be loaded beyond its intended maximum capacity, thereby allowing engineers and operators to observe how it performs under stress and to verify that all safety systems function correctly. If the platform can sustain this load without failure, it indicates that the repairs or modifications were successful and do not pose a risk to personnel using the platform.

In contrast, testing at lower percentages would not provide the same level of assurance regarding the safety of the platform after modifications. It's crucial for the integrity of lifting equipment that rigorous testing protocols are followed whenever changes are made, which is why the 150% requirement is emphasized in safety regulations and best practices.