According to OSHA 1926.1431, which device must be attached to the crane when signaling for the lift of a personnel platform?

The requirement for an anti two-block device to be attached to the crane during the signaling for the lift of a personnel platform is rooted in safety regulations set forth by OSHA. An anti two-block device helps to prevent the crane's hook from coming into contact with the upper part of the crane, typically the boom or other structures. This is crucial during personnel lifts, as two-blocking can lead to severe accidents, including both equipment damage and potential injury or death to personnel being lifted.

In scenarios where personnel are elevated in a lift or platform, the risk associated with two-blocking becomes even more critical, highlighting the need for the crane operator to maintain control and ensure safe operations. The presence of an anti two-block device serves as an important safeguard, alerting the operator to any potential mishaps that could occur during operation.

The other options, while important in different contexts—such as load indicators for monitoring weight, safety latches for securing hooks, and flagging devices for signaling—do not specifically address the prevention of two-blocking, which is a unique concern when lifting personnel. Thus, OSHA emphasizes the necessity of the anti two-block device in this particular application to enhance overall safety during lifts involving personnel platforms.