Sizing The Grounding Electrode Conductors; Figure 2-11, Multiple Connections To Dc Ground Rod (Method 1); Table 2-3, Ac Grounding Electrode Conductor Sizing - Magnum Energy MagnaSine MS-PE Series Owner's Manual

Installation
2.6.1

Sizing the Grounding Electrode Conductors

AC Side – The size of the AC grounding electrode conductor (GEC-AC) depends on the size of
the largest ungrounded conductor feeding the AC load center. One 8.4 mm
conductor will serve as an AC grounding electrode conductor (GEC-AC) for AC power conductors
smaller than and including 33.6 mm

Table 2-3, AC Grounding Electrode Conductor Sizing

Ungrounded Conductor
33.6 mm
42.4 to 53.5 mm
(#1 to #1/0 AWG)
67.4 or 85.0 mm
(#2/0 or #3/0 AWG)
(Over #3/0 AWG) thru 350 kcmil
DC Side – To size the DC grounding electrode conductor (GEC-DC), you must fi rst determine
which one of the following three methods will be used to connect the DC and AC grounding points
in the inverter's two electrical systems to the common earth ground:
• Method 1 (Figure 2-11): This method uses a separate grounding electrode for the DC system
and the AC system. 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).
The DC grounding electrode (GE-DC) must be bonded to the AC grounding electrode (GE-AC)
to establish a grounding electrode system; this bonding conductor (BC) cannot be smaller than
the largest grounding electrode conductor (GEC), either AC or DC.
AC Service
Panel
Neutral
GBB
Grounding Electrode
(AC side dedicated)

Figure 2-11, Multiple Connections to DC Ground Rod (Method 1)

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(#2 AWG) copper. See Table 2-3 for additional values.
2
Size of Largest
(#2 AWG) or smaller
2
2
2
85.0 mm
2
AC Electrical System
MS-PE Series Inverter/Charger
Hot
AC
GC
Neutral
SBJ
AC Ground
EGC - AC
GEC-AC
GE
Minimum Size of
Grounding Electrode Conductor
8.4 mm
2
13.3 mm
21.1 mm
33.6 mm
DC Electrical System
Positive
DC
GC
Negative
DC Ground
EGC - DC
Grounding
GEC-DC
System
GE
BC
Grounding Electrode
(DC side dedicated)
(#8 AWG) copper
2
(#8 AWG)
(#6 AWG)
2
(#4 AWG)
2
(#2 AWG)
2
DC Service
Panel
Negative
SBJ
GBB
© 2013 Magnum Energy, Inc.