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A single-core cable has a designed current of 12 A and voltage drop of . If
a maximum voltage drop of is allowed, find what is the longest cable can be
used if the supply is at 230 V ?
27.951 m
279.5 m
798.6 m
2795.18 m

Ask by Hart Hart. in Singapore
Jan 23,2025

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The longest cable that can be used is approximately 27.951 meters.

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To find the longest cable length allowed, we first calculate the maximum permissible voltage drop. The maximum voltage drop can be found using the formula:
Next, we use the voltage drop per unit length to find the maximum length of the cable. The total voltage drop over the length of the cable can be described as:
Rearranging to solve for :
Thus, the longest cable that can be used while keeping within the specified voltage drop is approximately 27.951 m.

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