SMA STP 8000TL-10 - Manual (Page 30)

6 Electrical Connection SMA Solar Technology AG
30 STP8-17TL-IA-en-31 Installation Manual
Connection of a second protective conductor
In some installation countries, a second protective conductor is required in order to prevent a contact
current in the event of failure of the original protective conductor.
For installation countries falling within the scope of validity of the IEC standard 62109, the following
requirements are applicable:
• Installation of protective conductor at the AC terminal with a conductor cross-section of at least
10 mm² Cu.
or
• Installation of a second protective conductor at the earth terminal with the same cross-section as
the original protective conductor at the AC terminal (see Section 6.3.3 "Connecting the Second
Protective Conductor", page 33).
You must always observe the applicable regulations in the country of installation.
Load disconnection unit
You must install a separate miniature circuit-breaker for each inverter in order to ensure that the
inverter can be securely disconnected under load. You should use a 3-pole miniature circuit-breaker.
If you are using a 1-pole miniature circuit-breaker, a residual voltage from the inverter may be present
on the relevant cable after disconnection (maximum permissible fuse protection (see Section 14
"Technical Data", page 95)).
Danger to life due to fire
When more than 1 inverter is connected in parallel to the same miniature circuit-breaker, the
protective function of the miniature circuit-breaker is no longer guaranteed. This could result in a
cable fire or destruction of the inverter.
• Never connect several inverters to a single miniature circuit-breaker.
• Observe the maximum permissible fuse protection of the inverter when selecting the miniature
circuit-breaker.
Danger to life due to fire
When a generator (inverter) and a load are connected to the same miniature circuit-breaker, the
protective function of the miniature circuit-breaker is no longer guaranteed. The currents from the
inverter and the electricity grid can accumulate to form overcurrents which are not detected by the
miniature circuit-breaker.
• Never connect loads between the inverter and the miniature circuit-breaker without fuse
protection.
• Always protect loads separately.