In an aerial device, where is the preferred point for attaching the lanyard of a body belt?

The preferred point for attaching the lanyard of a body belt in an aerial device is the boom. This is because the boom provides a secure and stable point for the attachment, which helps ensure the safety of the worker using the aerial device. When the lanyard is attached to the boom, it allows for proper fall protection while maintaining the operator's mobility within the aerial platform.

Attaching the lanyard to the boom reduces the risk of potential falls when the aerial device is in operation. Additionally, it helps in preventing the worker from being pulled off balance or exposed to excessive swinging if the device moves or shifts while in use. The boom is designed to have the structural integrity to support fall protection equipment, making it the safest option among the various points on an aerial device.

Other options such as the base, platform, or arm may not provide the same level of safety or stability. For instance, attaching to the platform may lead to precarious situations if the platform itself shifts. Similarly, anchoring to the arm could increase the worker's risk of falling or becoming unbalanced during operation. Therefore, the boom is the optimal choice for safe lanyard attachment in these scenarios.