SMA STP 15000TL Installation - Manual (Page 29)

SMA Solar Technology AG Electrical Connection
Installation Manual STP20TLHE-IA-IEN122222 29
6.3 Connection to the Electricity Grid (AC)
6.3.1 Conditions for the AC Connection
You must comply with the connection requirements of your network operator.
Residual-current protective device
The inverter is equipped with an integrated all-pole-sensitive residual-current monitoring unit. The
inverter can automatically differentiate between residual currents and normal leading leakage
currents.
If the network operator stipulates a residual-current protective device, you must use a residual-current
protective device that triggers in the event of a residual-current of 100 mA or more.
Further information on the use of a residual current protective device can be found in the Technical
Information "Criteria for selecting an RCD" at www.SMA.de/en.
Cable requirements
• External diameter: 14 mm … 25 mm
• Conductor cross-section: max. 16 mm²; with bootlace ferrule: max. 10 mm².
• Stripping length: 12 mm
• The cable must be dimensioned in accordance with the local and national regulations for the
dimensioning of cables. The requirements for the minimum conductor cross-section derive from
these regulations. Examples of factors influencing cable dimensioning are: nominal AC current,
type of cable, routing method, cable bundling, ambient temperature and maximum desired line
losses (for calculation of line losses, see design software Sunny Design from software version
2.0 at www.SMA.de/en).
Connection of a second protective conductor
In some installation countries, a second protective conductor is required to prevent a touch current in
the event of a malfunction in 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 the protective conductor on the AC terminal with a conductor cross-section of at
least 10 mm² Cu.
or
• Installation of a second protective conductor on the earth terminal with the same cross-section
as the original protective conductor on the AC terminal (see Section 6.3.3 "Connecting the
Second Protective Conductor" (page 33)).
In each case, observe the applicable regulations for the site.