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Difficulty: MediumSequential Steps and Chronology

Please read the following excerpt from an installation manual for a smart thermostat:

'First, mount the thermostat base to the wall. Before connecting the wiring, ensure that the main circuit breaker is turned off. Once the wires are secured, attach the display faceplate to the base. Only after mounting the faceplate should you restore power at the circuit breaker. Finally, download the mobile application to complete the Wi-Fi configuration.'

Based on these guidelines, which of the following actions must be completed immediately before restoring power at the main circuit breaker?

  1. A
    Connecting the thermostat wiring
  2. B
    Downloading the mobile application
  3. Attaching the display faceplate to the thermostat baseAnswer
  4. D
    Turning off the main circuit breaker

Answer

Attaching the display faceplate to the thermostat base
The instructions specify that the power should be restored at the circuit breaker 'only after' the faceplate is mounted. Therefore, attaching the display faceplate to the thermostat base is the step that must be completed immediately prior to restoring power.

Step-by-Step Solution

1
Identify the target action in the question stem.
The target action is 'restoring power at the main circuit breaker'.
To find the step immediately preceding it, we need to locate where this action is mentioned in the instructions.
2
Analyze the sentence containing the target action to find chronological relationships.
The text states: 'Only after mounting the faceplate should you restore power at the circuit breaker.'
The phrase 'only after' establishes that mounting the faceplate is a prerequisite that directly precedes restoring power.
3
Match this prerequisite step to the correct option.
The prerequisite is attaching the display faceplate to the base, which matches the correct option.
This confirms the sequence of events leading up to the power restoration.

Key Concept

Tracking sequential steps and understanding chronological markers in instructional texts.
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Topics

Sequential Steps and Chronology

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