Multi crane lifts require how many signal person(s) and require rating deduction of what percent?

• A. 2; 10%
• B. 1; 25%
• C. 2; 25%
• D. 1; 5%

Answer: (B)

In a multi-crane lift, communication and coordination are crucial, so only one signal person is used to direct the operation. This single signal person helps keep crane movements synchronized and prevents conflicting signals that could cause swings or overloads.

For the rating, using more than one crane to lift the same load introduces extra risk and potential uneven load sharing, so the practical lifting capacity is reduced. A 25% deduction from the crane’s rated capacity is applied to provide a safety margin for coordination, rigging, and dynamic effects during the lift.

So the correct approach is one signal person and a 25% rating deduction.