Electrical Technician Testing Wires in Distribution Box

An electrician is shown performing tests inside an open electrical distribution box. The technician is testing circuits using a yellow voltage tester with red and black probes. Inside the electrical box are white circuit breakers with black switches, and many colored wires that are connected to terminals. This image could be used for safety training materials, for electricians to study electrical circuit design, or for training material for those in industrial and maintenance positions.