SMA SUNNY BOY 2500, Руководство по установке

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Installation requirements SMA Technologie AG
Page 16 SB2500-11:SE2006 Installation Guide
Rating for a line circuit breaker in a photovoltaic electrical
power unit operated in parallel with the low-voltage grid
Various factors should be taken into account when selecting line circuit breakers.
These include, for example:
• The type of cable used (conductor material and insulation)
• Ambient temperatures affect the cables (higher temperatures result in a reduced
maximum current load)
• Method of routing the cable (reduces the ampacity of the conductor)
• Bundling cables together (reduces the ampacity of the conductor)
• Loop impedance [Z] (in the event of a body contact this limits the current that can
flow and therefore determines the response behaviour of the circuit breaker)
• Adequate space between the line circuit breakers in order to avoid overheating
(in case of overheating, the line circuit breaker could trigger earlier).
• Selectivity
• Protection class of the connected load (VDE 0100, part 410), Protection against
electric shock and / or the international standard IEC 60364-4-41:1992
The following standards
1
should be followed in all cases:
• DIN VDE 0298-4 („Types of cable installation and conducting
capacity“)
• DIN VDE 0100; part 430 („Protection measures for protection of cables
and conductors in terms of overcurrent“) and
/ or the international standard IEC
364-4-43:1977 and IEC 364-4-473:1977
• DIN VDE 0100; part 410 (Protection against electric shock“) and / or
the international standard IEC 60364-4-
41:1992
Please have a look at chapter 9 "Rating for a line circuit breaker" (page 39).
1. The standards mentioned above are to be only used as a guideline for your
installation. They apply for installations in Germany. Please note that other
standards will apply for different countries throughout the world.