24 User Manual THEIA HE-t String Inverters 357115.013, Issue 1.0, 2011 March
4.3.3. Grounding
The THEIA HE-t inverter meets all relevant safety requirements and includes internal
lightning protection. Appropriate grounding of the entire PV system limits voltage surges,
gives a common reference point for the conductive parts and facilitates the operation of the
overcurrent protection devices.
Figure 4.3.4: Ground terminals in the customer
connection area
1. The DC ground terminal is located to
the right of the –NEG terminal in the
customer connection area and labeled
GND/PE.
2. The AC ground terminal is located in
the lower right corner of the customer
connection area and labeled GND
.
DANGER: Ensure correct grounding of the inverter and the PV array!
Grounding should be carried out by qualified persons only, and comply with the
relevant local and national electrical regulations.
• The PV strings may be ungrounded, or grounded through either the negative or the positive
string conductors, which are connected to the DC ground terminal via the grounding strap.
• The grounded conductors must be sized according to the local and national electrical
regulations, and only carry current when electrical malfunctions occur.
• Follow the safety instructions and specifications from the different PV module
manufacturers regarding grounding requirements.
• All metal parts of the THEIA HE-t inverters are electrically bonded to ground through the
terminal labeled GND on the AC side
• Only valid for France: According to UTE C 15-712-1 a minimum cross section area of 6.0
mm² / 10 AWG is required for the ground wire connection.
CAUTION: Ensure correct grounding of the PV conductors!
If the positive or negative PV conductors are grounded , then the grounding strap
must be connected to the DC ground terminal and the system must NOT be
grounded at any other point, as voltage potentials can appear and possibly damage
electrical components.
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