Electrical Inspection, Testing and Certification Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Electrical Inspection, Testing, and Certification Exam. Study with multiple choice questions, each with detailed explanations. Enhance your skills and knowledge to ensure success on your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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

0.7 ohms
0.9 ohms
0.5 ohms
1.0 ohm

The correct answer is: 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.