From which side should banks always be energized according to proper procedure?

Energizing banks, which are arrangements of transformers, switchgear, or other electrical equipment, from the high side is an industry standard practice. This procedure is crucial for maintaining safety and system integrity. When banks are energized from the high side, it helps in managing voltage levels effectively and minimizes the risk of backfeeding into the system, which can create hazardous conditions for personnel working on the lower-voltage side or maintenance tasks.

By energizing from the high side, the equipment operates within its designed parameters and regulations are more easily adhered to, reducing the likelihood of equipment failure or electrical incidents. Moreover, ensuring the high side is energized first allows for the safe operation of protective devices that could otherwise trip or malfunction if the lower side is energized first.

The other choices do not align with standard safety practices in electrical operations, which is why they are not considered correct.