Refrigeration & Air Conditioning Mechanic Red Seal · Question
Before working on any electrical circuit in an HVACR system, what is the first step a technician should always take after identifying the correct power source?
The very first step is to de-energize the circuit. This ensures that no current is flowing before any contact is made with the wiring, which is fundamental to e
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Question: Before working on any electrical circuit in an HVACR system, what is the first step a technician should always take after identifying the correct power source?
Answer options: ✅ De-energize the circuit at the disconnect or breaker
- Test for voltage at the circuit terminals with a meter
- Apply a lockout/tagout device to the power source
- Inform others of the impending work
Correct answer: De-energize the circuit at the disconnect or breaker
Explanation: The very first step is to de-energize the circuit. This ensures that no current is flowing before any contact is made with the wiring, which is fundamental to electrical safety.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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