What does BNK stand for?

Bank

A group of electrical devices, usually transformers or capacitors, connected in a way to increase capacity or to inter connect as threephase. OR A number of similar pieces of equipment grouped in line and connected, e.g., a bank of engine cylinders, coke ovens, or transformers. OR A mass of soil rising above a digging level. OR Any group of similar electrical devices con-nected together for use as a single device.