Chapter A General rules of electrical installation design

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Q12 © Schneider Electric - all rights reserved Q - EMC guidelines i VL1 V arrestor VL2 i Earthing bar Protected device Fig. Q16 : The protected device must be connected to the surge-arrestor terminals Earthing bar SA Isc prot SA 3 Implementation The type of communication cable employed is an important parameter. It must be suited to the type of transmission. To create a reliable communication link, the following parameters must be taken into account: b Characteristic impedance b Twisted pairs or other arrangement b Resistance and capacitance per unit length b Signal attenutation per unit length b The type(s) of shielding used In addition, it is important to use symmetrical (differential) transmission links because they offer higher performance in terms of EMC. In environments with severe EM conditions, however, or for wide communication networks between installations that are not or are only slightly equipotential, in conjunction with IT, TT or TN-C systems, it is highly recommended to use optical fibre links. For safety reasons, the optical fibre must not have metal parts (risk of electric shock if the fibre links two areas with different potentials). 3.8 Implementation of surge arrestors The wiring of surge arrestors is as important as the selection of the surge arrestor itself. Figures Q1 and Q17a below shows that the connection cables of the surge arrestor and its disconnection circuit-breaker must not exceed 50 centimetres to ensure effective protection. Common mode impedance 1 m of cable = 1 µH L1 = 0.5 m = 0.5 µH L2 = 1.5 m = 1.5 µH di lightning = 10 kA dt = 10 µs V arrestor = 1,200 V Protected outgoers Common-mode impedance length y 50 cm Surge Arrestor Schneider Electric - Electrical installation guide 2008 Device withstand in common mode: 2,000 V V PROT = VL1 + VL2 + V arrestor where di 10 kA VL1 = L1 = 0.5 µH x = 500 V dt 10 µs di 10 kA VL2 = L2 = 1.5 µH x = 1,500 V dt 10 µs V PROT = 500 V + 1,500 V + 1,200 V = 3,200 V ! L1 + L2 must therefore not exceed 0.5 m Protected outgoers Earthing bar Fig. Q17a : Examples of assemblies combining surge arrestors (SA) and disconnection circuit-breakers to reduce the common-mode impedances and the area of upstream-downstream loops Isc prot SA
Q - EMC guidelines Fig. Q17b : The protected device must be connected to the surge-arrestor terminals 3 Implementation 3.9 Cabinet cabling (Fig. Q18) Each cabinet must be equipped with an earthing bar or a ground reference metal sheet. All shielded cables and external protection circuits must be connected to this point. Anyone of the cabinet metal sheets or the DIN rail can be used as the ground reference. Plastic cabinets are not recommended. In this case, the DIN rail must be used as ground reference. 3.10 Standards Schneider Electric - Electrical installation guide 2008 Potential Reference Plate It is absolutely essential to specify the standards and recommendations that must be taken into account for installations. Below are several documents that may be used: b EN 50174-1 Information technology - Cabling installation. Part 1: Specification and quality assurance b EN 50174-2 Information technology - Cabling installation. Part 2: Installation planning and practices inside buildings Q13 © Schneider Electric - all rights reserved
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Chapter A General rules of electrical installation design

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