Magnum Energy MS-PE Series - Manual (Page 31)

Page 24
©
2013 Magnum Energy, Inc.
Installation
• 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 2 (#6 AWG) 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.
• 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
DC Service
Panel
AC Service
Panel
DC Electrical System AC Electrical System
Neutral
Positive
Negative
DC
Grounding
System
Negative
SBJ
GC
GE
GEC-AC
EGC - AC
AC Ground DC Ground SBJ
EGC - DC
GC Neutral
Hot
GEC-DC
GBB GBB
Grounding Electrode
(AC and DC sides shared)
MS-PE Series Inverter/Charger
Figure 2-12, Multiple Connections to DC Ground Rod (Method 2)
Figure 2-13, Single Connection to DC Ground Rod (Method 3)
AC
DC Service
Panel
AC Service
Panel
DC Electrical System AC Electrical System
Neutral
Positive
Negative
DC
Grounding
System
Negative
SBJ
GC
GEC-AC
EGC - AC
AC Ground DC Ground SBJ
EGC - DC
GC Neutral
Hot
GEC-DC
GE
GBB GBB
Grounding Electrode
(DC side dedicated)
MS-PE Series Inverter/Charger