Sizing The Grounding Electrode Conductors; Figure 2-19, Multiple Connections To Dc Ground Rod (Method 1); Table 2-5, Ac Grounding Electrode Conductor Sizing - Sensata Magnum Energy MS Series Owner's Manual

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 AWG (8.4 mm
conductor will serve as an AC grounding electrode conductor (GEC – AC) for AC power conductors
smaller than and including #2 AWG (33.6 mm

Table 2-5, AC Grounding Electrode Conductor Sizing

Size of Largest Ungrounded
#2 AWG (33.6 mm
#1 to #1/0 AWG (42.4 to 53.5 mm
#2/0 or #3/0 AWG (67.4 to 85.0 mm
Over #3/0 AWG (85.0 mm
through 350 kcmil
DC Side – To size the DC grounding electrode conductor, 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 2-19): 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 (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).
The DC grounding electrode (GE – DC) must be bonded to the AC grounding electrode (GE – AC)
to make a grounding electrode system. This bonding conductor (BC) cannot be smaller than the
largest grounding electrode conductor, either AC or DC.

Figure 2-19, Multiple Connections to DC Ground Rod (Method 1)

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Conductor
) or smaller
2
)
2
AC Electrical System
AC Service
MS Series Inverter/Charger
Panel
Hot
AC
Neutral
GC
Neutral
SBJ
AC Ground
GBB
EGC - AC
GEC-AC
GE
Grounding Electrode
(AC side dedicated)
) copper. See Table 2-5 for additional values.
2
Minimum Size of Grounding
Electrode Conductor
#8 AWG (8.4 mm
) #6 AWG (13.3 mm
2
) #4 AWG (21.1 mm
2
#2 AWG (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)
Installation
) copper
2
)
2
)
2
)
2
)
2
DC Service
Panel
Negative
SBJ
GBB
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