©
2009 Magnum Energy Inc
Page 32
Installation
Method 2 (see fi gure 2-18):
When the AC and DC service panels are near each other, then
the AC Grounding Electrode Conductor (GEC – AC) and DC Grounding Electrode Conductor (GEC
– DC) can be connected to a single Grounding Electrode. In this method - since there are multiple
connections to the DC Grounding Electrode (GEC – DC) - the size of the DC Grounding Electrode
Conductor can not be smaller than the largest conductor in the DC system (usually the battery-
to-inverter cable).
A C
D C S e rvice
P a n e l
A C S e rvice
P a n e l
D C E lec tric al S y s tem
A C E lec tric al S y s tem
N eutral
Positive
N egative
D C
G rounding
S y s tem
N e g a tive
S B J
GC
GE
GE C -A C
E GC - A C
AC Ground
D C Ground
S B J
E GC - D C
GC
N e u tra l
H ot
GE C -D C
GB B
GB B
Grounding Electrode
(AC and D C sides shared)
M S -A E S e rie s In ve rte r/C h a rg e r
Figure 2-18, Multiple Connections to DC Ground Rod (Method 2)
Method 3 (see fi gure 2-19):
The AC Grounding Electrode Conductor (GEC – AC) is bonded to
the DC ground point and the DC Grounding Electrode Conductor (GEC – DC) is the
only connection
to the Grounding Electrode, which must be a rod, pipe, or plate electrode.
In this method, since there is only one connection to the ground rod, the DC Grounding Electrode
Conductor is not required to be larger than #6 AWG (13 mm
2
) copper. The reasoning for allowing
this smaller grounding electrode conductor is that it is only required to stabilize the system voltage
with respect to earth and the other properly-sized conductors in each electrical system will safely
carry any fault currents if they occur.
A C
D C S e rvice
P a n e l
A C S e rvice
P a n e l
D C E lec tric al S y s tem
A C E lec tric al S y s tem
N eutral
Positive
N egative
D C
G rounding
S y s tem
N e g a tive
S B J
GC
GE C -A C
E GC - A C
AC Ground
D C Ground
S B J
E GC - D C
GC
N e u tra l
H ot
GE C -D C
GE
GB B
GB B
Grounding Electrode
(D C side dedicated)
M S -A E S e rie s In ve rte r/C h a rg e r
Figure 2-19, Single Connection to DC Ground Rod (Method 3)
