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It can also be used at all levels of the power supply network. Thermaltake Smart BX1 650W Power Supply, 80 PLUS Bronze, 120mm Fan, 1x EPS, 2x PCI-E (6P+2P), 6x SATA, 4x Molex, 1x Floppy at, the online Gaming PC, server computer and technology experts. This device is connected to the power supply in parallel with the loads (circuits) that it is intended to protect (see Figure 4). In summary, as far as Section 534 is concerned, TN-C-S systems are treated the same as TN-S systems for the selection and installation of SPDs.Ī Surge Protection Device (SPDs)is a component of the electrical installation protection system. However as SPDs can only be applied the TN-S side (consumer side) of the TN-C-S system, and given SPDs are typically installed at the main distribution board, the distance between the SPD installation point and the PEN split will almost always be greater than 0.5 m, so there is a need to have an SPD between N and PE as required for a TN-S system.Īs Type 1 SPDs are specifically installed to prevent the risk of loss of human life (to BS EN62305) through dangerous sparking which could present a fire hazard for example, in the interests of safety alone, the engineering judgement is that an SPD should be fitted between N and PE for a TN-C-S system as it would in a TN-S system.
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Figure 3 – Installation of Types 1, 2 and 3 SPDs, for example in TN-C-S systems (click to expand scheme) The minimum SPD connection requirements at or near the origin of the installation for a TN-C-S system requires further clarification as Section 534 of BS 7671 illustrates (see Figure 3 below) a Type 1 SPD being required between the live and PE conductors – the same as required for a TN-S system. The CT2 SPD configuration is often referred the ‘3+1’ arrangement for a 3 phase supply.
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Therefore, only if the impulse current I imp cannot be calculated, 534.2.3.4.3 advises that the minimum value Iimp for an SPD between neutral and the protective conductor is 50kA 10/350 for a 3 phase CT2 installation, 4 times 12.5kA 10/350 of the SPDs between the live conductors. This higher energy SPD (typically a spark-gap for a Type 1 SPD) is required as lightning currents arise towards the protective conductor and as such this higher energy SPD sees up to 4 times the surge current of the SPDs connected between the live conductors.Ĭlause 534.2.3.4.3 therefore advises that the SPD between neutral and the protective conductor is rated at 4 times the magnitude of the SPD between the live conductors. A higher energy SPD is used between neutral and the protective conductor.