Under what condition can a technician connect 3 phase equipment to building or generator power?

The scenario described involves connecting 3-phase equipment to a power source, which can present significant risks and complexities. A technician must possess the appropriate qualifications and training to ensure that they can safely and correctly perform this task. This ensures not only the safety of the technician but also the integrity of the equipment and the electrical system being used.

Qualified personnel are familiar with electrical codes, safety standards, and the specific requirements related to 3-phase systems. They understand how to assess the configuration of the electrical setup, how to perform the connection without causing damage or hazards, and how to implement the necessary safety measures. By having trained personnel handle these operations, the risks associated with electrical work, including electrical shocks and equipment damage, are minimized.

This context is important because connecting such equipment without proper knowledge can lead to severe accidents or electrical failures. The other options do not provide the necessary emphasis on qualifications and safety that are critical for handling 3-phase connections, thereby failing to ensure the safe operation of electrical systems.