SMA SMC 5000 Installation - Manual (Page 19)

SMA Technologie AG Requirements for the Installation
Installation Guide SMC50_60-11:SE2006 Page 19
Sizing of a circuit breaker for the AC line of a photovoltaic invert-
er for utility interaction
• Cable type (material and isolation)
• Ambient temperature surrounding the cable (higher temperatures reduce the con-
ducting capacity of the cable)
• Type of installation for the cable (can also reduce the conducting capacity of the
cable)
• Bundling of cables (can reduce the conducting capacity of the cable)
• Loop impedance [Z] (reduces the current that flows in case of a ground fault cur-
rent through a body and has influence on the tripping characteristics of the circuit
breaker)
• Adequate clearance between the circuit breakers in order to avoid excessive
heating (automatic circuit breakers trip earlier when they are warmer).
• Fuse selectivity
• Protection class of the connected consumer (VDE 0100 Part 410 "Protection
against electric shock"
a
and/or the international standard IEC 60364-4-41:1992)
Each connection to a Sunny Mini Central
5000/6000 must be equipped with a sep-
arrate circuit breaker 40 A. No other con-
sumers may be connected to the cable.
Several factors have to be considered when you define the size of the circuit
breaker for your PV plant:
The following standards have to be complied with:
• DIN VDE 0298-4 ("Types of cable installation and conducting capacity")
• DIN VDE 0100 Part 430 1 ("Protection measures for protection of cables
and conductors in terms of overcurrent") and/or the international stan-
dard IEC 364-4-43:1977 and IEC 364-4-473:1977
• VDE 0100 Part 410 1 ("Protection against electric shock") and/or the inter-
national standard IEC 60364-4-41:1992
a. The standards mentioned above are to be only used as a guideline for your in-
stallation. The above mentioned standards apply for installations in Germany.
Please note that other standards will apply for different countries throughout the
world.