Question
What is the purpose of a power supply interlock?
Answer Options
- A) To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
- B) To shut down the unit if it becomes too hot
- C) To ensure that dangerous voltages are removed if the cabinet is opened
- D) To shut off the power supply if too much voltage is produced
Correct Answer: C
Explanation
An interlock is a safety mechanism designed to prevent access to high-voltage circuits when the power is on. It is a mandatory feature in commercially manufactured high-power equipment, such as vacuum tube amplifiers and high-voltage power supplies.
The purpose of a power supply interlock is to ensure that dangerous voltages are removed if the cabinet is opened. The interlock switch breaks the primary power circuit the moment the safety panel or cabinet door is opened, protecting the user from accidental contact with lethal internal voltages.
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