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For the common small cables used in domestic electricity the maximum current for a short time is 10 amps per mm2, reducing to 8 A/mm2 for loads that are on for 1½ hours per day, to 4 A/mm2 for loads that are on for 6 hours/day, and to 2 A/mm2 for continuous loads. Currents higher than the above will give excessive energy losses in heating the cables.

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Q: What is the current carrying capacity of Sq mm copper wire?
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