- +27 11 476 6917
- info@hhk.co.za
- HHK House, Cnr Ruth Crescent & Ethel Avenue, Northcliff Ext 12
We design and install comprehensive surge protection systems that shield your entire facility from internally generated and externally injected voltage transients. Our approach goes beyond plug-in protectors — we engineer layered, coordinated protection at every entry point to your building's electrical and data infrastructure, in full compliance with SANS 62305 and IEC 61643 standards.
A surge protective device (SPD)acts as a pressure-release valve for your electrical system. Under normal operating conditions, it remains passive — drawing no power, doing nothing. But the instant voltage exceeds a safe threshold (typically anything above 120 V in a standard 230/400 V installation), the SPD activates within nanoseconds, diverting the excess energy safely to earth and clamping the voltage to a level your equipment can withstand.
Without proper surge protection, transient overvoltages cause cumulative damage: degraded insulation, corrupted microprocessor logic, premature component failure, and — in severe cases — catastrophic fire. A single unprotected surge event can destroy servers, disable security systems, shut down production lines, and wipe irreplaceable data.
Effective surge protection isn't a single device — it's a coordinated, cascading defence strategy. HHK applies the internationally recognised three-stage protection concept:
Type 1
Installed at the main distribution board or service entrance, Type 1 SPDs are designed to handle the enormous energy of a direct lightning current (10/350 µs waveform).
They prevent the surge from ever entering your building’s internal wiring. These are mandatory for any structure fitted with an external lightning protection system, as required by SANS 62305-4.
Type 2
Mounted at sub-distribution boards, Type 2 SPDs handle the residual energy that passes through the Type 1 stage and protect against switching surges generated within your own facility — from motors, HVAC systems, lifts, and large industrial equipment.
They reduce the surge voltage further, protecting downstream circuits.
Type 3
Installed directly at sensitive equipment — server racks, medical devices, laboratory instruments, security panels, and communication cabinets — Type 3 SPDs provide the final layer of protection, clamping residual voltages to levels safe for even the most delicate electronics.
Our surge protection solutions are deployed across data centres, mining operations, telecommunications infrastructure, hospitals, commercial buildings, manufacturing facilities, and residential estates. Every installation is preceded by a thorough site survey to identify all incoming services that require protection — because a chain is only as strong as its weakest link.
Every HHK installation includes a full test report and a legally recognised Certificate of Compliance — essential for insurance purposes and regulatory audits.
Our specialists will assess your site, identify your risk exposure, and design a system that meets SANS standards and stands up to Southern Africa's lightning season.
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