A Group III B-B transformer has a turns ratio of what?

A Group III B-B transformer typically has a turns ratio of 10:1. This means that for every 10 turns of wire on the primary winding, there is 1 turn on the secondary winding, creating a significant voltage step-down. The specified turns ratio of 10:1 is consistent with the design and function of transformers in this category, which are often used to manage voltage levels efficiently while providing isolation and transformation within electrical systems.

In practical applications, this turns ratio allows the transformer to reduce voltage significantly, making it suitable for various configurations in electrical distribution, allowing equipment to operate safely at lower voltages. The choice of 10:1 aligns with industry standards for transformers designed for specific tasks within Group III classifications, ensuring that they meet required specifications for performance.