SMA SB 3600SE-10 - Manual (Page 29)

Load-break switch and cable protection:
Damage to the inverter due to the use of screw-type fuses as load-break switches
Screw-type fuses (e.g. DIAZED fuse or NEOZED fuse) are not load-break switches.
• Do not use screw-type fuses as load-break switches.
• Use a load-break switch or circuit breaker as a load disconnection unit (for information and
design examples, see the Technical Information "Circuit Breaker" at www.SMA-Solar.com).
☐ In PV systems with multiple inverters, protect each inverter with a separate circuit breaker.
Make sure to observe the maximum permissible fuse protection (see Section 11 "Technical
Data", page 57). This will prevent residual voltage being present at the corresponding cable
after disconnection.
☐ Loads installed between the inverter and the circuit breaker must be fused separately.
Grounding conductor monitoring
The inverter is equipped with a grounding conductor monitoring device. This grounding conductor
monitoring device detects when there is no grounding conductor connected and disconnects the
inverter from the utility grid if this is the case. Depending on the installation site and grid
configuration, it may be advisable to deactivate the grounding conductor monitoring. This is
necessary, for example, in an IT system if there is no neutral conductor present and you intend to
install the inverter between two line conductors. If you are uncertain about this, contact your grid
operator or SMA Solar Technology AG.
☐ Grounding conductor monitoring must be deactivated after initial start-up depending on the
grid configuration (see Section 8.10, page 49).
Safety in accordance with IEC 62109 when the grounding conductor monitoring is
deactivated
In order to guarantee safety in accordance with IEC 62109 when the grounding conductor
monitoring is deactivated, one of the following measures must be taken:
• Connect a grounding conductor made of copper wire with a cross-section of at least 10
mm² to the connecting terminal plate for the AC cable.
• Connect additional grounding with the same cross-section as the connected grounding
conductor to the connecting terminal plate for the AC cable (see Section 6.2.3
"Connecting Additional Grounding", page 31). This prevents touch current if the
grounding conductor at the connecting terminal plate for the AC cable fails.
Connection of additional grounding
In some countries, additional grounding is generally required. In each case, observe the
locally applicable regulations.
6 Electrical Connection SMA Solar Technology AG
Operating Manual 29 SB36-50SE-BE-en-11