Figure 2-20, Multiple Connections To Dc Ground Rod (Method 2); Figure 2-21, Single Connection To Dc Ground Rod (Method 3) - Sensata Magnum Energy MS Series Owner's Manual

Installation
Method 2 (Figure 2-20): 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 cannot
be smaller than the largest conductor in the DC system (usually the battery-to-inverter cable).
AC Service
GBB

Figure 2-20, Multiple Connections to DC Ground Rod (Method 2)

Method 3 (Figure 2-21): 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
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.
GBB

Figure 2-21, Single Connection to DC Ground Rod (Method 3)

Page 37
AC Electrical System
MS Series Inverter/Charger
Panel
Hot
AC
Neutral
GC
Neutral
SBJ
AC Ground
EGC - AC
GEC-AC
Grounding Electrode
(AC and DC sides shared)
AC Electrical System
AC Service
MS Series Inverter/Charger
Panel
Hot
AC
Neutral
GC
Neutral
SBJ
AC Ground
EGC - AC
GEC-AC
DC Electrical System
Positive
DC
GC
Negative
DC Ground
EGC - DC
Grounding
System
GEC-DC
GE
) copper. The reasoning for allowing
2
DC Electrical System
Positive
DC
GC
Negative
DC Ground
EGC - DC
Grounding
System
Grounding Electrode
(DC side dedicated)
© 2016 Sensata Technologies
DC Service
Panel
Negative
SBJ
GBB
DC Service
Panel
Negative
SBJ
GBB
GE
GEC-DC