The main objective of the electrical installation protection system is to limit overvoltages to values that are acceptable for the equipment. The electrical installation protection system consists of: =one or more SPDs depending on the building configuration; =the equipotential bonding: metallic mesh of exposed conductive parts. Implementation The procedure to protect the electrical and electronic […]
Surge Protection Devices (SPD) are used for electric power supply networks, telephone networks, and communication and automatic control buses. The Surge Protection Device (SPD) is a component of the electrical installation protection system. This device is connected in parallel on the power supply circuit of the loads that it has to protect (see Fig.1). It […]
To protect an electrical installation in a building, simple rules apply for the choice of 1. SPD(s); 2. its protection system. For a power distribution system, the main characteristics used to define the lightning protection system and select a SPD to protect an electrical installation in a building are: 1. SPD 1.1 quantity of SPD 1.2 type 1.3level of exposure […]
A SPD must always be installed at the origin of the electrical installation. Location and type of SPD The type of SPD to be installed at the origin of the installation depends on whether or not a lightning protection system is present. If the building is fitted with a lightning protection system (as per IEC […]
Operating voltage Uc Depending on the system earthing arrangement, the maximum continuous operating voltage Uc of SPD must be equal to or greater than the values shown in the table in Figure 1. Fig.1 – Stipulated minimum value of Uc for SPDs depending on the system earthing arrangement (based on Table 534.2 of the IEC […]
Impulse current Iimp 1. Where there are no national regulations or specific regulations for the type of building to be protected: the impulse current Iimp shall be at least 12.5 kA (10/350 µs wave) per branch in accordance with IEC 60364-5-534. 2. Where regulations exist: standard IEC 62305-2 defines 4 levels: I, II, III and […]
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