Electrical Inspection, Testing and Certification Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

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If Ze = 0.4 ohms, R1 = 0.2 ohms, and R2 = 0.1 ohms, what is the value of EFLZ Zs?

0.7 ohms

To find the value of EFLZ Zs, also known as the Earth Fault Loop Impedance (Zs), the formula applied is Zs = Ze + R1 + R2, where Ze is the earth fault loop impedance, R1 is the resistance of the line conductors, and R2 is the resistance of the protective conductor.

In this case, we have:

- Ze = 0.4 ohms

- R1 = 0.2 ohms

- R2 = 0.1 ohms

Substituting these values into the formula yields:

Zs = 0.4 ohms + 0.2 ohms + 0.1 ohms

Zs = 0.4 + 0.2 + 0.1

Zs = 0.7 ohms

Thus, the calculation shows that the total Earth Fault Loop Impedance (Zs) is 0.7 ohms. This indicates that the chosen answer aligns perfectly with the values computed based on the standard formula used in electrical systems for determining the loop impedance.

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0.9 ohms

0.5 ohms

1.0 ohm

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