When should the electrician secure power and lighting?

The correct answer emphasizes that an electrician should secure power and lighting when directed by the on-scene leader. This is crucial because the on-scene leader has an overview of the operational situation and can assess the risks involved. They can determine the appropriate time to secure power based on safety considerations and the current actions of emergency personnel.

Securing power and lighting prematurely could pose risks if conditions change or if personnel are still engaged in potentially hazardous activities that require power. The directive from the on-scene leader ensures that decisions are made collaboratively, based on the immediate needs and safety of everyone involved, rather than on individual judgment or assumptions about when securing power might be necessary. This coordinated approach is vital for maintaining safety and operational effectiveness in an emergency situation.