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A 70 mm² cable size refers to the cross-sectional area of the conductor, which is 70 square millimeters. This measurement indicates the amount of electrical current the cable can safely carry, with larger cross-sectional areas typically allowing for higher current capacities. It is commonly used in electrical installations for power distribution, especially in industrial and commercial applications. The actual current capacity also depends on factors such as insulation type, installation conditions, and ambient temperature.

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