Which activity is NOT exempt from holding a valid electrical contractor license?

The activity that is NOT exempt from holding a valid electrical contractor license is the one related to conducting testing and calibration by a trained technician. In Washington State, activities that involve electrical work typically require a licensed electrician or electrical contractor. Testing and calibration often involve work on electrical systems that may affect safety, functionality, and compliance with regulatory standards. Therefore, such work needs to be performed by individuals or entities that are properly licensed to ensure that all safety protocols and state regulations are adhered to.

The other activities mentioned, such as working on a company's owned property or performing work as a sub-contractor for an electrical utility, can be exempt from licensing requirements under specific circumstances set by Washington State law. Additionally, engaging in work under a lease agreement may not necessitate a contractor’s license if the work falls under certain exempt categories. However, the requirement for a license remains critical in instances involving testing and calibration, reinforcing the necessity for compliance and safety in electrical practices.