6 Electrical Connection
SMA Solar Technology AG
Operating manual
STP15-25TL-30-BE-en-17
27
☐ Insulation stripping length: 12 mm
☐ The cable must be dimensioned in accordance with the local and national directives for the
dimensioning of cables. The requirements for the minimum wire size derive from these
directives. 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 the design software "Sunny Design" from software
version 2.0 at www.SMA-Solar.com).
Residual-current monitoring unit:
The inverter does not require an external residual-current device when operating. If local
regulations require the use of a residual-current device, the following must be observed:
☐ The inverter is compatible with type A and B residual-current devices that have a rated residual
current of 100 mA or higher (information about the selection of a residual-current device see
technical information "Criteria for Selecting a Residual-Current Device" at www.SMA-
Solar.com). Each inverter in the system must be connected to the utility grid via a separate
residual-current device.
Overvoltage category:
The inverter can be used in grids of overvoltage category III or lower in accordance with
IEC 60664-1. That means that the inverter can be permanently connected to the grid-connection
point of a building. In case of installations with long outdoor cabling routes, additional measures to
reduce overvoltage category IV to overvoltage category III are required (see the Technical
Information "Overvoltage Protection" at www.SMA-Solar.com).
Additional grounding:
Safety in accordance with IEC 62109
The inverter is not equipped with a grounding conductor monitoring device. In order to
guarantee safety in accordance with IEC 62109, you must take one of the following
measures:
• 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 29). 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.
• If additional grounding is required, connect an additional grounding that has at least the
same cross-section as the connected grounding conductor to the connecting terminal
plate for the AC cable (see Section 6.2.3, page 29). This prevents touch current if the
grounding conductor at the connecting terminal plate for the AC cable fails.
Summary of Contents for 15000TL
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