Kyoritsu Loop/PSC Testers by Major Tech: Proving Electrical Protection Works When It Matters
Electrical safety doesn’t stop at installation it must be verified. One of the most critical checks in any electrical system is loop testing. This test confirms that, in the event of a earth fault, protective devices will disconnect the supply fast enough to keep people and equipment safe.
This is where Major Tech South Africa, supplying professional Kyoritsu instruments, plays a vital role.
What Is a Loop/PSC Test?
A loop test measures how easily fault current can flow back to earth during an earth fault. It assesses the complete fault path from the live conductor, through the protective device, and back to earth. The PSC test asses the maximum current that could flow during fault conditions, so that you can verify that protective devices are correctly rated for the intended installation.
What Does a Loop/PSC Tester Check?
A loop tester measures the earth fault loop resistance (Zs) of a circuit. This resistance directly affects how much fault current can flow in the fault current path.
Low resistance allows faster disconnection. High resistance can delay or prevent protective devices from operating correctly causing a fire or shock hazard.
PSC testing measures prospective short current and protective earth fault current, the higher of the two being recorded as the PSC.
Why Is Loop/PSC Testing So Important?
Circuit breakers and fuses rely on sufficient fault current to trip within the required time. If loop resistance is too high, disconnection may be delayed, leaving exposed metal parts live and dangerous. PSC testing ensures circuit breakers have sufficient breaking capacity, preventing nuisance tripping, failure or overload of these protective devices. PSC testing is the most important for verifying that the installation is correctly set up and protected under the worst-case fault condition.
What Does It Prevent?
Correct Loop/PSC testing helps prevent:
- Electric shock, fire and equipment damage
- Damage to electrical protective devices
- Overheating of conductors ensuring fault
- Fire caused by prolonged fault conditions, overload circuit breakers, overheating at cables
What Does a Loop/PSC Test Confirm?
A successful loop test confirms that:
- The Earthing
- system is effective
- Protective devices will operate as designed, and validate their coordination
- The installation complies with safety regulations as a part of commissioning and/or periodic inspections
Where Are Loop/PSC Testers Used?
Loop testing is commonly performed on:
- Socket outlets
- Final circuits
- Distribution boards
- Fixed electrical equipment
Summary:
Loop Impedance Testing: Verifies disconnection and/or timing of disconnection under earth fault conditions
PSC Testing: Verifies breaker function at fault current. Measures the required circuit breaker breaking capacity under worst case short-circuit conditions.
Kyoritsu Loop Testers Supplied by Major Tech
Major Tech supplies trusted Kyoritsu Loop/PSC testers designed for professional electrical verification.
- Kyoritsu 4118A
A versatile loop impedance, PSC and PFC tester ideal for routine loop testing on sockets and distribution boards. It provides fast, accurate reading and clear results for confident decision-making on site.
- Kyoritsu 4140
A digital loop impedance PSC and PFC tester featuring anti-trip technology, allowing accurate loop testing without nuisance RCD tripping and the ability to choose between L-PE or L-L/L-N PFC Tests, perfect for modern installations with sensitive protection.
Why Choose Major Tech & Kyoritsu?
Kyoritsu instruments are globally trusted for their accuracy, durability, and reliability. Supplied locally by Major Tech, they are backed by local expertise, calibration support, and dependable after-sales service.
The Bottom Line
Loop testing proves that electrical protection will work when it matters most.
With Kyoritsu Loop/PSC testers supplied by Major Tech South Africa, electricians can test with confidence, ensure compliance, and deliver safer installations every time.
