What term is used for a ground on a primary circuit where a positive contact has occurred?

The correct term for a ground on a primary circuit where a positive contact has occurred is known as "Heavy Ground." This term typically describes a grounding scenario in electrical systems where a direct connection to the ground exists, often used when there is a significant potential difference that is being handled, allowing overcurrent protection devices to function properly. A Heavy Ground implies that the ground connection is robust, providing a low-resistance path intended to protect equipment and personnel from any electrical faults.

In contrast, other terms used in electrical contexts have distinct meanings. For instance, a "Live Ground" suggests that the ground path may carry current under certain conditions, which is not typical for a reliable ground connection. "Dead Ground" implies that the circuit is not energized, and therefore can be misleading in the context of a primary circuit where an active positive contact exists. A "Floating Ground," on the other hand, describes a ground reference that is not directly connected to the earth ground, which can lead to instability and unpredictable behavior in electrical circuits.