Line vs. Load Wiring: What's the Difference?
The common electrical terms line and load have very basic meanings, and often describe a wire's position relative to the device it's connected to.
What are a difference between series and parallel connection of
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Electrical wiring to indoor light switch -- two black hot wires or
Delivery to consumers - U.S. Energy Information Administration (EIA)
Series vs Parallel Circuits: What's the Difference?
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Line vs. Load Wiring: What's the Difference?