Electrician Red Seal · Question
A commercial building replaces old magnetic ballast fluorescent fixtures with new LED lighting and upgrades some general-purpose induction motors with high-efficiency types. What would an electrician expect to see regarding the overall power factor of the building?
Many modern LED lighting fixtures include active power factor correction, resulting in a power factor closer to unity than older magnetic ballasts. High-efficie
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Question: A commercial building replaces old magnetic ballast fluorescent fixtures with new LED lighting and upgrades some general-purpose induction motors with high-efficiency types. What would an electrician expect to see regarding the overall power factor of the building?
Answer options:
- A significant decrease in power factor, leading to more lagging conditions.
- No noticeable change, as lighting and motors have little impact. ✅ An improvement in power factor, possibly closer to unity.
- A shift to a highly leading power factor due to LED drivers.
Correct answer: An improvement in power factor, possibly closer to unity.
Explanation: Many modern LED lighting fixtures include active power factor correction, resulting in a power factor closer to unity than older magnetic ballasts. High-efficiency motors also generally have better power factors, particularly at partial loads. Therefore, these upgrades would likely lead to an overall improvement in the building's power factor.
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- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
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