RD Series Owner's Manual - Magnum Energy

Installation
Method 2 (see Figure 2-17): 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 batteryto-inverter
cable).
AC Electrical System
DC Electrical System
AC Service
Panel
GBB
Neutral
SBJ
GEC-AC
GC
AC
N eutral
EGC - AC
RD Series Inverter/Charger
Hot
Grounding
System
GE
Positive
DC
N egative
GC
AC Ground D C Ground SBJ
EGC - DC
GEC-DC
DC Service
Panel
Negative
GBB
Grounding Electrode
(AC and DC sides shared)
Figure 2-17, Multiple Connections to DC Ground Rod (Method 2)
Method 3 (see Figure 2-18): 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.
AC Electrical System
DC Electrical System
AC Service
Panel
GBB
Neutral
SBJ
GC
AC
N eutral
EGC - AC
RD Series Inverter/Charger
Hot
Positive
DC
N egative
GC
AC Ground D C Ground SBJ
EGC - DC
DC Service
Panel
Negative
GBB
GEC-AC
Grounding
System
GE
GEC-DC
Grounding Electrode
(DC side dedicated)
Figure 2-18, Single Connection to DC Ground Rod (Method 3)
© 2010 Magnum Energy, Inc.
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