What is the appropriate method for a Qualified Electrical Worker during a preoperational check of a digger derrick?

The appropriate method for a Qualified Electrical Worker during a preoperational check of a digger derrick is to operate the unit through the range of all functions. This approach ensures that the worker can verify that each function of the equipment is working properly and safely. By engaging all the functions, the worker checks for any malfunctions or issues that could pose hazards during operation, such as mechanical failures or controls that do not respond as expected. It also allows the operator to ensure that the load handling capabilities are intact and that all safety systems, such as limit switches and alarms, are operational.

Engaging all functions helps to identify potential problems before the equipment is put into service, thereby enhancing safety for both the operator and the crew working around the derrick. This thorough method is a critical aspect of good practice in preventative maintenance and operational safety in electrical work.