What should be done to an unused current transformer connected to a potentially energized circuit?

An unused current transformer that is connected to a potentially energized circuit poses safety risks and can affect the performance of the electrical system. Disconnecting it ensures that there is no possibility of unintended current flow through the transformer, which could lead to overheating, malfunction, or inaccurate readings in the system. Leaving it connected, even if it is not in use, can create hazards such as electrical arcs or short circuits if someone were to inadvertently interact with the circuit.

Capping it off may seem like a solution but does not address the fundamental issue of ensuring no current flows through an unused transformer. Moreover, using it for another circuit could introduce undesired variables and complications, making it essential to handle the transformer appropriately.

Thus, the safest and most compliant action is to disconnect the transformer entirely from the circuit to mitigate any potential risks associated with its presence.