Alencon SPOT: Installation,
Operation, and Maintenance Manual
33 |
P a g e
8.5 SPOT Grounding Requirements
PV Grounding
SPOT supports positive, negative, and floating grounding schemes. The frame of the
PV string should be connected to the SPOT’s grounding lug.
The size of the conductor is usually based on the size of the largest conductor in the DC system.
The inputs are functionally (high impedance) coupled to the ground through the insulation
monitoring circuit. Therefore, treat all terminals as a high voltage signals.
Inverter Grounding
The SPOT’s outputs are isolated from the PV array. The output (either monopolar or bipolar) is
also isolated from the ground system. The SPOT supports any inverter grounding option with
the assumption that the ground potential is maintained between the potentials of the negative
and positive output terminals.
Shock hazard
All power terminals are considered to have a high voltage potential to ground. To
reduce the risk of shock during installation, always treat all terminals as high voltage
and test for voltage before touching exposed wiring. The work should be performed
by qualified service personnel.
The SPOT enclosure should always be connected to earth ground (regardless of the
input/output grounding schemes). Not properly grounding the SPOT enclosure can be
dangerous for SPOT operators.
Ground lugs are included with every SPOT shipment and can be attached where a ground label
is found on the SPOT enclosure (see examples in Figure 24).
F
IGURE
24:
SPOT
G
ROUND
L
UG
L
OCATION
E
XAMPLES
(
IN
O
RANGE
)
