When is re-examination for a hoisting license required?

Re-examination for a hoisting license is required when there is a power failure during any hoisting operation. This situation is critical because a power failure can affect the safe and effective operation of hoisting equipment. It poses a risk not only to the operator but also to those around the work site. In such cases, re-examination ensures that the operator can demonstrate updated knowledge and skills relevant to safely handling equipment under altered circumstances, thereby reinforcing their competency in managing emergency situations.

The other scenarios provided do not typically necessitate re-examination. For instance, moving to a new location does not inherently change the operator's qualifications or understanding of hoisting operations. Similarly, completing operator training represents a step toward obtaining a license rather than a cause for re-examination. Lastly, receiving a warning may warrant a review of practices but does not directly trigger a mandatory re-examination unless it highlights a significant deficiency in the operator's ability to perform hoisting tasks safely.