Question

As a rule, grabs, hooks, spreader-bars, or any other rigging attachments should have a lifting capacity ________ of the sling being used.

Option 1: Equal to
Option 2: Less than
Option 3: Twice
Option 4: Half

Answer 1

Rigging attachments should have a lifting capacity twice that of the sling used, to provide a safety margin against dynamic forces during lifting operations.

Step-by-step explanation:

As a rule, grabs, hooks, spreader-bars, or any other rigging attachments should have a lifting capacity twice the capacity of the sling being used. This ensures that the attachments are strong enough to handle the load without failure, providing an important safety margin. For example, if a sling is rated to lift 1000 kg, then the rigging attachments should have a lifting capacity of at least 2000 kg. This safety measure is crucial because, during lifting, various dynamic forces come into play, such as swinging, acceleration, or deceleration that could momentarily increase the force on the rigging components beyond the static load they are carrying.