The insulated value of a pole mounted platform is lost if the worker is ___.

The insulated value of a pole mounted platform is lost if the worker is belted off to the pole because this creates a direct conductive path between the worker and the pole, which may be grounded. When the worker is attached to the pole, they effectively shunt the insulating properties of the platform, leaving them exposed to electrical potential in the event of a fault or accidental contact with live electrical components.

In contrast, if the worker is belted off to the platform railing, the tripod, or not belted off at all, the insulated value of the platform remains intact, and the worker is less likely to encounter a hazardous situation. Being attached to the platform or not secured at all does not compromise the insulating characteristics of the platform, which are designed to protect against electrical shocks. Hence, the most significant risk occurs when the worker is secured directly to the pole, making that choice the correct answer.