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Installation Requirements SMA Technologie AG

Page 16 SB25_30-11:SE0307 Installation Guide

Rating for a Line Circuit Breaker in a Photovoltaic Power Generating

System Operated in Parallel to 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 affecting the cables (higher temperatures result in a reduced

maximum current load)

• Method of routing the cable (reduces the maximum current load)

• Bundling cables together (reduces the maximum current load)

• Loop impedance [Z] (in the event of a body contact this limits the current that can

flow and therefore determines the response behavior of the circuit breaker)

• Sufficient distance between the circuit breakers so as to avoid undue heating (heat

can trigger the circuit breaker early)

•Selectivity

• Protection class of the connected load (VDE 0100, part 410), Protection against

electric shock

The following standards should be followed in all cases:

Please pay attention to section 10 "Rating for a Line Circuit Breaker" (Page 55).

• DIN VDE 0298-4 (Cable routing and current-carrying capacity)

• DIN VDE 0100, part 430 (Protective measures; protection of cable and

cords against overcurrent)

• DIN VDE 0100, part 410 (Protective measures; protection against electric

shock)

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