Figure 2-12, Multiple Connections To Dc Ground Rod (Method 2); Figure 2-13, Single Connection To Dc Ground Rod (Method 3) - Magnum Energy MagnaSine MS-PE Series Owner's Manual

• Method 2 (Figure 2-12): When the AC and DC service panels are near each other, the AC
grounding electrode conductor (GEC-AC) and the DC grounding electrode conductor (GEC-DC)
can be connected to a single grounding electrode (GE). In this method—since there are multiple
connections to the DC grounding electrode (GE-DC)—the size of the DC grounding electrode
conductor (GEC-DC) cannot be smaller than the largest conductor in the DC system (usually
the battery-to-inverter cable).
AC Service
Panel
Neutral
GBB

Figure 2-12, Multiple Connections to DC Ground Rod (Method 2)

• Method 3 (Figure 2-13): 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 (GE), 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 (GEC-DC) is not required to be larger than 13.3 mm
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 Service
Panel
Neutral
GBB

Figure 2-13, Single Connection to DC Ground Rod (Method 3)

© 2013 Magnum Energy, Inc.
AC Electrical System
MS-PE Series Inverter/Charger
Hot
AC
GC
Neutral
SBJ
AC Ground
EGC - AC
Grounding
GEC-AC
Grounding Electrode
(AC and DC sides shared)
AC Electrical System
MS-PE Series Inverter/Charger
Hot
AC
GC
Neutral
SBJ
AC Ground
EGC - AC
GEC-AC
Grounding
DC Electrical System
Positive
DC
GC
Negative
DC Ground
EGC - DC
System
GEC-DC
GE
DC Electrical System
Positive
DC
GC
Negative
DC Ground
EGC - DC
System
GE
Grounding Electrode
(DC side dedicated)
Installation
DC Service
Panel
Negative
SBJ
GBB
(#6 AWG) copper.
2
DC Service
Panel
Negative
SBJ
GBB
GEC-DC
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