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What are the standard colors for the Hots in a 3 phase 60Hz mains supply in the US and are these same colors also standard in other countries which use 60Hz 3 phase supplies?
Wiki User
∙ 15y ago
For 120/208v systems the colors are black - red - blue with a white neutral. For 277/480v and higher systems the colors are brown - orange - yellow with a grey neutral. Countries outside of North America generally use different colors.
Wiki User
∙ 15y ago
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