Which test also confirms the polarity of a circuit?

The test that confirms the polarity of a circuit is the continuity of the circuit protective conductor (CPC) method 1 (R1+R2). During this test, the resistance of the protective conductors is measured. Ensuring that these conductors are connected correctly is essential for safety, as they play a vital role in providing a path for fault currents and ensuring that protective devices operate correctly.

When conducting the continuity test, technicians typically check each of the live conductors (phase conductors) against the CPC to verify that the connections are intact and properly aligned. This helps to confirm that the circuit operates safely and effectively, and that there are no miswirings that could lead to dangerous situations.

The other tests listed serve different purposes. For instance, the insulation resistance test checks the integrity of the insulation but does not specifically address circuit polarity. The earth fault loop impedance test measures the impedance of the earth fault loop path, providing insights into the effectiveness of the earthing system but not directly confirming polarity. The voltage drop test assesses the voltage loss in a circuit under load but does not examine the connections to confirm their correctness. Therefore, the continuity of CPC method 1 is specifically tailored to ensure polarity checks within the circuit structure.