... , when handcart in working or isolated position, and with handle operating, the handcart won’t move, so ... be moved to working position to prevent closing with earthing wire.4.Once handcart is away from isolated position, ... state, while in working position,S8 is in open state. S9 gets 5 pairs NO contact to ... When handcart is in isolated position,S9 is in open state,while in working position,S9 is close ...