Electrical Inspection, Testing and Certification Practice Exam

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Prepare for the Electrical Inspection, Testing and Certification Exam. Explore multiple-choice questions and detailed explanations. Get confident for the test!

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What is the maximum test current required on a 100mA RCD?

0.5 x 100mA
1 x 100mA
1.5 x 100mA
2 x 100mA

The correct answer is: 1 x 100mA

For a 100mA Residual Current Device (RCD), the maximum test current required during testing is typically set at 1 times the rated residual operating current. This ensures that the device can be properly assessed for its ability to trip under fault conditions at its rated level. By applying 1 x 100mA during testing, the RCD is subjected to the exact rated capacity, allowing for an accurate test of its performance, ensuring it will trip effectively when a fault occurs. Testing at this level verifies the functionality in real-world situations, where the device must effectively interrupt the circuit under a fault current that would be present at its rated current. The other choices represent different multiples of the rated current, which do not align with the standard practice for testing RCDs. These would either exceed the necessary test current or not provide the correct assessment for the device's operation at its specified ratings.