When electrical power is applied to the bus, which relays are energized?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

When electrical power is applied to the bus, which relays are energized?

Explanation:
When power is applied to the bus, relays that are fed directly from the bus voltage will energize to enable the protective and control paths. The PCC and the TCC receive power from the bus so they pick up as soon as voltage is present, making their coils energized and their circuits ready to operate. The other relays, PCO and TCO, don’t energize just from bus power—they require additional control signals or specific conditions (like a command from the control system or a fault/trip event) before their coils activate. So, energization on bus power itself is expected for PCC and TCC.

When power is applied to the bus, relays that are fed directly from the bus voltage will energize to enable the protective and control paths. The PCC and the TCC receive power from the bus so they pick up as soon as voltage is present, making their coils energized and their circuits ready to operate. The other relays, PCO and TCO, don’t energize just from bus power—they require additional control signals or specific conditions (like a command from the control system or a fault/trip event) before their coils activate. So, energization on bus power itself is expected for PCC and TCC.

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