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Not everything needs to be. Many standard wire insulations are rated at 600 volts, some 300, and some are more or less. It would be cost-prohibitive to have everything rated at 480 volts. Especially things designed to operate at 120 volts. Things rated for 480 but running at 120 would be physically larger than necessary, and therefore more expensive. If you're wondering why everything doesn't just run at 480 it's because it's not safe for residential applications.

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Q: Why isn't everything rated at 480 volts?
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