Electrician Red Seal · Question
An electrician is retrofitting an old control panel. The existing motor starter uses a 2-wire control method. Which type of start/stop device is typically associated with a 2-wire control circuit?
A 2-wire control circuit uses a maintained contact device, such as a selector switch or pressure switch, to start and stop the motor. The device either complete
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Question: An electrician is retrofitting an old control panel. The existing motor starter uses a 2-wire control method. Which type of start/stop device is typically associated with a 2-wire control circuit?
Answer options:
- Momentary push buttons ✅ Selector switch (maintained contact)
- Jog push button
- Emergency stop button
Correct answer: Selector switch (maintained contact)
Explanation: A 2-wire control circuit uses a maintained contact device, such as a selector switch or pressure switch, to start and stop the motor. The device either completes or breaks the circuit directly. Momentary push buttons like those for 'start' or 'jog' are typical of 3-wire control circuits using a seal-in contact.
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