SPD application example in Supermarket: Difference between revisions
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==== Installation examples ==== | ====<br>Installation examples ==== | ||
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[[Image:Fig J43.jpg|left]] | <br>[[Image:Fig J43.jpg|left]] <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>'''''Fig. J43:''' Application example: supermarket'' | ||
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'''''Fig. J43:''' Application example: supermarket'' | |||
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===== Solutions and schematic diagram ===== | ===== Solutions and schematic diagram ===== | ||
The surge arrester selection guide has made it possible to determine the precise value of the surge arrester at the incoming end of the installation and that of the associated disconnection circuit breaker. | The surge arrester selection guide has made it possible to determine the precise value of the surge arrester at the incoming end of the installation and that of the associated disconnection circuit breaker. | ||
*As the sensitive devices (Uimp < 1.5 kV) are located more than 30 m from the incoming protection device, the fine protection surge arresters must be installed as close as possible to the loads. | *As the sensitive devices (Uimp < 1.5 kV) are located more than 30 m from the incoming protection device, the fine protection surge arresters must be installed as close as possible to the loads. | ||
*To ensure better continuity of service for cold room areas: | *To ensure better continuity of service for cold room areas: | ||
- "si" type residual current circuit breakers will be used to avoid nuisance tripping caused by the rise in earth potential as the lightning<br> wave passes through. | - "si" type residual current circuit breakers will be used to avoid nuisance tripping caused by the rise in earth potential as the lightning<br> wave passes through. | ||
*For protection against atmospheric overvoltages: | *For protection against atmospheric overvoltages: | ||
- install a surge arrester in the main switchboard<br> - install a fine protection surge arrester in each switchboard (1 and 2) supplying the sensitive devices situated more than 30 m from the<br> incoming surge arrester<br> - install a surge arrester on the telecommunications network to protect the devices supplied, for example fire alarms, modems,<br> telephones, faxes. | - install a surge arrester in the main switchboard<br> - install a fine protection surge arrester in each switchboard (1 and 2) supplying the sensitive devices situated more than 30 m from the<br> incoming surge arrester<br> - install a surge arrester on the telecommunications network to protect the devices supplied, for example fire alarms, modems,<br> telephones, faxes. | ||
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===== Cabling recommendations ===== | |||
===== Cabling recommendations ===== | |||
*Ensure the equipotentiality of the earth terminations of the building. | *Ensure the equipotentiality of the earth terminations of the building. | ||
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===== Installation recommendations ===== | ===== Installation recommendations ===== | ||
*Install a surge arrester,Imax = 40 kA (8/20 µs) and a C60 disconnection circuit breaker rated at 20 A. | *Install a surge arrester,Imax = 40 kA (8/20 µs) and a C60 disconnection circuit breaker rated at 20 A. | ||
*Install fine protection surge arresters, Imax = 8 kA (8/20 µs) and the associated C60 disconnection circuit breakers rated at 20 | *Install fine protection surge arresters, Imax = 8 kA (8/20 µs) and the associated C60 disconnection circuit breakers rated at 20 | ||
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[[Image:Fig J44 EN.jpg|left]] | <br>[[Image:Fig J44 EN.jpg|left]] <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>'''''Fig. J44:'' Telecommunications network''' | ||
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'''''Fig. J44:'' Telecommunications network'' | |||
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Revision as of 06:57, 5 February 2010
Installation examples
Fig. J43: Application example: supermarket
Solutions and schematic diagram
The surge arrester selection guide has made it possible to determine the precise value of the surge arrester at the incoming end of the installation and that of the associated disconnection circuit breaker.
- As the sensitive devices (Uimp < 1.5 kV) are located more than 30 m from the incoming protection device, the fine protection surge arresters must be installed as close as possible to the loads.
- To ensure better continuity of service for cold room areas:
- "si" type residual current circuit breakers will be used to avoid nuisance tripping caused by the rise in earth potential as the lightning
wave passes through.
- For protection against atmospheric overvoltages:
- install a surge arrester in the main switchboard
- install a fine protection surge arrester in each switchboard (1 and 2) supplying the sensitive devices situated more than 30 m from the
incoming surge arrester
- install a surge arrester on the telecommunications network to protect the devices supplied, for example fire alarms, modems,
telephones, faxes.
Cabling recommendations
- Ensure the equipotentiality of the earth terminations of the building.
- Reduce the looped power supply cable areas.
Installation recommendations
- Install a surge arrester,Imax = 40 kA (8/20 µs) and a C60 disconnection circuit breaker rated at 20 A.
- Install fine protection surge arresters, Imax = 8 kA (8/20 µs) and the associated C60 disconnection circuit breakers rated at 20
Fig. J44: Telecommunications network
