Surge Protection Devices
SPDs have now been introduced as a requirement into the 18th edition wiring regulations for domestic installations. To determine if protection against transient overvoltage is required, a risk assessment has to be carried out.
The type 2 SPD is the main protection system for all low voltage electrical installations and is characterised by an 8/20 µs current wave. When installed in an electrical switchboard, it prevents the spread of overvoltage in the electrical installation and protects the loads.
• No resetting of SPD required, the excess voltage is quickly taken to earth, before the rest of the circuits are damaged
• Meets the requirements of the IEC 61634-1 and EN 61643-11 standards
• An SPD enclosure can be fitted next to any existing or new consumer unit of any brand where surge protection is required
• SPDs have indicators to advise end of life of the device
The range includes a wiring kit complete with a 32A MCB for the installation of a type 2 SPD into a consumer unit, and a standalone IP65 enclosure that can be fitted next to an existing consumer unit, supplied with a 100A main switch, SPD and 32A MCB.
SPD Know How
SPDs provide protection from two forms of surge, LEMP – Lighting Electro Magnetic Pulse and SEMP – Switching Electro Magnetic Pulse. SPDs do no protect an installation from lighting strikes.
Surges are transient overvoltage in short durations, increasing the voltage measured between two or more conductors. For a mains power supply, these conductors would be the live, neutral and earth. Without adequate protection, there is potential for damage to electrical equipment and possible downtime, however the greatest consequence is a risk to human life.
38 | Wiring Devices and Accessories
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