What should be connected first when installing a transformer on a transformer bank?

When installing a transformer on a transformer bank, the correct procedure involves connecting the grounds first before the neutrals. This practice is essential for safety and system integrity. By connecting the grounds first, you ensure a safe path for fault currents, which can prevent electrical shock hazards and equipment damage during the installation process. Ground connections help stabilize the system and mitigate potential electrical faults.

Connecting the neutrals after the grounds ensures that if a fault occurs during the installation, any stray voltage can safely dissipate to the ground. This sequence is critical in maintaining a secure system and adhering to industry safety standards.

Other choices do not prioritize safety in the same way. For instance, connecting neutrals first, as suggested in some options, could potentially expose technicians to electrical hazards during installation, as the safety measure of having a grounded connection in place would not be established beforehand. It’s also essential to recognize that while connecting phases is important, it should follow the grounding procedure to ensure any faults are handled properly.