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Home > categories > Machinery & Equipment > Tower Cranes > Four for crane, two for insurance, two for insurance. What does that mean?

Question:

Four for crane, two for insurance, two for insurance. What does that mean?

Four for crane, two for insurance, two for insurance. What does that mean?

Answer:

Refers to the air switch and the electric leakage protector in the electric tray.

Four limit: torque, ultra high, variable amplitude, walking limit device. Two insurance: hook insurance and reel safety device.

Refers to the air switch and the electric leakage protector in the electric tray.

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