Electrical Technology 2020-4-9
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For the true/false questions, please answer “correct” or “incorrect”. A correct answer earns 3 points, while an incorrect answer earns 2 points. Explaining the reasons in detail is worth 5 points. Based on experience, for low-voltage power cables, given their relatively high load currents, the cross-sectional area is generally selected based on the allowable voltage drop; thereafter, the heating conditions and mechanical strength are verified. ( )X
Error. First, select the cross-section based on the heating conditions, and then verify its voltage loss and mechanical strength.
Based on experience, for low-voltage power lines, since their load current is relatively high, the cross-sectional area is generally selected based on heating conditions, after which the allowable voltage drop and mechanical strength are checked.