KACO blueplanet 1502x - Manual (Page 14)

Page 14 blueplanet Installation Instructions 1502x - 5002x
(B) Grounding multiple inverters:
Use a DC GE (Grounding Electrode – ground rod) and
run an appropriately sized conductor from the DC GE
to the AC GE. This will become a GEC for the inverters.
Then use a short appropriately sized conductor jumper
to each inverter that is irreversibly spliced to the GEC.
Figure 5.3: System grounding-multiple inverters
Section 5 · Installation and Start-up
5.4 Grounding the inverter
Grounding must be done according to the NEC
(National Electric Code) and any applicable local elec-
tric codes! The inverter has two sides of grounding we
need to consider.
System ground (grounding): connecting the circuit to
ground (i.e. negative of a PV generator, neutral of a split
single phase or bi-polar dc system).
Equipment ground (bonding): Connecting all non-
current carrying metal parts to ground (array structure,
metal enclosure, module frame)
The AC Grounding Electrode Conductor (GEC) shall
be sized as required by NEC 250.66 and the GEC does
not have to be larger than #6 copper or #4 aluminum if
connected to Rod, Pipe or Plate Electrodes!
The DC Equipment Grounding Conductor (EGC) shall
be sized in accordance with NEC 250.122, if ground fault
protection is used. Otherwise, it should be the same
size as the current carrying conductor!
(A) Grounding single inverters:
For the AC side (system ground) use a continuous irre-
versibly appropriately sized conductor bare or insula-
ted conductor (GEC) to ground the Inverter to the AC GE
(Grounding Electrode - ground rod or in some cases the
main water line). If the ground rod is unavailable, splice
irreversibly to the AC GEC.
The DC side (equipment ground) should start at the PV
array. All non-current carrying exposed metal parts of
equipment, raceways, and other enclosures of the PV
system shall be grounded according to NEC 690.43 (e.g.
each PV module, combiner and junction box, metal roo-
fing, mounting structure, DC disconnect, and Inverter).
The grounding equipment must be listed and labeled.
Figure 5.2: System grounding