The Crane boom tip has a pulley block, referred as head pulley block. The hook also has pulleys hence referred as hook pulley block. When these two block collide - referred as a TWO BLOCK SITUATION- this results in damaging or breaking the hoist-line wire rope, leading to an accident. So a two block situation needs to be avoided for safe crane operation. A2B switch avoids a two block situation hence named as Anti two(2) Block switch, hence A2B switch
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Why did u caling anti two block
The Crane boom tip has a pulley block, referred as head pulley block. The hook also has pulleys hence referred as hook pulley block. When these two block collide - referred as a TWO BLOCK SITUATION- this results in damaging or breaking the hoist-line wire rope, leading to an accident. So a two block situation needs to be avoided for safe crane operation. A2B switch avoids a two block situation hence named as Anti two(2) Block switch, hence A2B switch