SPD and protection device coordination table: Difference between revisions
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{{Menu_Overvoltage_protection}} | {{Menu_Overvoltage_protection}}__TOC__ | ||
The table in {{FigureRef|J37}} below shows the coordination of disconnecting circuit breakers (external SCPD) for Type 1 and 2 SPDs of the Schneider Electric brand for all levels of short-circuit currents (always refer to the latest tables provided by manufacturers). | |||
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The table in {{FigureRef|J37}} below shows the coordination of disconnecting circuit breakers (external SCPD) for Type 1 and 2 SPDs of the Schneider Electric brand for all levels of short-circuit currents. | |||
Coordination between SPD and its disconnecting circuit breakers, indicated and guaranteed by Schneider Electric, ensures reliable protection (lightning wave withstand, reinforced protection of impedant short-circuit currents, etc.) | Coordination between SPD and its disconnecting circuit breakers, indicated and guaranteed by Schneider Electric, ensures reliable protection (lightning wave withstand, reinforced protection of impedant short-circuit currents, etc.) | ||
{{FigImage|DB422496_EN|svg|J37|Example of coordination table between SPDs and their disconnecting circuit breakers (Schneider Electric brand). Always refer to [https://www.se.com/ww/en/download/document/CA903014E/ the latest table].}} | |||
== Coordination with upstream protection devices == | == Coordination with upstream protection devices == | ||
===Coordination with overcurrent protection devices=== | === Coordination with overcurrent protection devices === | ||
In an electrical installation, the external SCPD is an apparatus identical to the protection apparatus: this makes it possible to apply ''' | In an electrical installation, the external SCPD is an apparatus identical to the protection apparatus: this makes it possible to apply '''selectivity and cascading '''techniques for technical and economic optimization of the protection plan. | ||
===Coordination with residual current devices=== | ===Coordination with residual current devices=== | ||
If the SPD is installed downstream of an earth leakage protection device, the latter should be of the "si" or selective type with an immunity to pulse currents of at least 3 kA (8/20 μs current wave). | If the SPD is installed downstream of an earth leakage protection device, the latter should be of the "si" or selective type with an immunity to pulse currents of at least 3 kA (8/20 μs current wave). | ||
Latest revision as of 11:25, 21 May 2024
The table in Figure J37 below shows the coordination of disconnecting circuit breakers (external SCPD) for Type 1 and 2 SPDs of the Schneider Electric brand for all levels of short-circuit currents (always refer to the latest tables provided by manufacturers).
Coordination between SPD and its disconnecting circuit breakers, indicated and guaranteed by Schneider Electric, ensures reliable protection (lightning wave withstand, reinforced protection of impedant short-circuit currents, etc.)
Coordination with upstream protection devices
Coordination with overcurrent protection devices
In an electrical installation, the external SCPD is an apparatus identical to the protection apparatus: this makes it possible to apply selectivity and cascading techniques for technical and economic optimization of the protection plan.
Coordination with residual current devices
If the SPD is installed downstream of an earth leakage protection device, the latter should be of the "si" or selective type with an immunity to pulse currents of at least 3 kA (8/20 μs current wave).
