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What formula is to be used to calculate the voltage drop in road street lighting?

I want to know how long the copper and aluminum wire can be for the grid, and need to know the voltage drop first. How is it calculated?

Street Light
September 27, 2023

Jacob Jones

Bachelor's degrees in electronic engineering. Skilled in designing LED electronic components, products, and systems, developing and testing prototypes, troubleshooting, and debugging. 8+ years of extensive experience in the electrical and electronic manufacturing industry. Reach Me Now>>

Jacob Jones

U=I*R. First, we will need to calculate the resistance value of the line, which is calculated by r=PL/S. “P” represents the resistivity of the line material. For example, the resistivity of the copper line is normally 0.0175 per meter. “L” is the length of the line (m), and “S” is the cross-sectional area of the line (mm²). Then we will use i=P/u to calculate the current. P is the power of the light, and u is the voltage of the line. After we know the current and the resistance value, we can use U=I*R to calculate the voltage drop.

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