What should be done with the ground strap when terminating medium voltage cable through a window current transformer?

In the context of terminating medium voltage cables through a window current transformer (CT), it is essential to ensure proper grounding for both safety and the performance of the electrical system. Attaching the ground strap correctly is crucial to prevent any potential hazards and to ensure accurate current measurement by the CT.

When the ground strap is doubled back through the CT and attached to ground, it helps to maintain a reference point for the current being measured. This method ensures that any induced noise or stray currents are effectively mitigated, allowing for a cleaner signal and reducing the likelihood of interference in the readings from the current transformer. Proper grounding also protects personnel and equipment by providing a defined path for fault currents, should any faults occur within the electrical system.

Leaving the ground strap unattached or cutting it off completely would compromise the safety and functionality of the system. Failure to properly ground the CT could lead to inaccurate measurements or potential safety hazards. Attaching it to the terminal block may not provide the same level of noise reduction or fault current protection, which is why the method of doubling it back through the CT is favored.