How to Conduct a PSC Electrical Test

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Electrical installations require rigorous testing to ensure their safety and resilience against potential faults. One crucial aspect of this testing is the Prospective Short Circuit (PSC) electrical test. Unlike the measurement of earth fault loop impedance at the furthest point, the PSC electrical test is performed at the installation’s origin, specifically within the consumer unit.

Measurement Setup:

Begin by measuring voltage and current between the line and neutral, as well as between the line and earth within the consumer unit. Pulling off the line conductor first, followed by the neutral, check the short circuit current in amps.

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Similarly, testing between line and earth, check the prospective earth fault current in amps.

Device Ratings and Handling:

Verify that the incoming device boasts a breaking capacity of 33 kA, while devices within the consumer unit are rated at 10 kA. It’s crucial to understand that circuit breakers rated at 6 kA can reset after withstanding shock currents up to 6,000 amps, whereas those at 10 kA can only be reset if fault currents stay below 7,500 amps.

Safety Measures:

Always adhere to on-site guides and regulations for the proper execution of PSC electrical tests. This meticulous approach ensures that the electrical system can withstand potential short circuits and earth faults, guaranteeing the safety of both equipment and individuals.

Conducting a PSC electrical test is a fundamental practice in electrical maintenance, providing valuable insights into the robustness of the installation and fostering a secure operational environment. By meticulously following the outlined procedure and considering device ratings, these tests contribute significantly to the prevention of electrical hazards and the overall longevity of the electrical system.


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