MS Series Owner's Manual - Magnum Energy
MS Series Owner's Manual - Magnum Energy
MS Series Owner's Manual - Magnum Energy
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Installation<br />
2.6.1 Sizing the Grounding Electrode Conductors<br />
AC Side - The size of the AC Grounding Electrode Conductor (GEC –AC) depends on the size of<br />
the largest ungrounded conductor feeding the AC load center. One #8 AWG (8.4 mm 2 ) copper<br />
conductor will serve as an AC Grounding Electrode Conductor (GEC –AC) for AC power conductors<br />
smaller than and including #2 AWG (33.6 mm 2 ) copper. See Table 2-4 for additional values.<br />
Table 2-4, AC Grounding Electrode Conductor Sizing<br />
Size of Largest Ungrounded<br />
Conductor<br />
Minimum Size of Grounding<br />
Electrode Conductor<br />
#2 AWG or smaller #8 AWG (8.4 mm 2 )<br />
#1 to #1/0 AWG #6 AWG (13.3 mm 2 )<br />
#2/0 or #3/0 AWG #4 AWG (21.1 mm 2 )<br />
Over #3/0 AWG<br />
through 350 kcmil<br />
#2 AWG (33.6 mm 2 )<br />
DC Side - To size the DC Grounding Electrode Conductor, you must first determine which one of the<br />
following three methods will be used to connect the DC and AC grounding points in the inverter’s<br />
two electrical systems to the common “earth” ground:<br />
Method 1 (see figure 2-17): This method uses a separate Grounding Electrode for the DC system<br />
and the AC system. In this method - since there are multiple connections to the DC Grounding<br />
Electrode (GEC – DC) - the size of the DC Grounding Electrode Conductor cannot be smaller than<br />
the largest conductor in the DC system (usually the battery-to-inverter cable).<br />
The DC Grounding Electrode (GE – DC) must be bonded to the AC Grounding Electrode (GE – AC)<br />
to make a grounding electrode system; this bonding conductor (BC) cannot be smaller than the<br />
largest Grounding Electrode Conductor, either AC or DC.<br />
AC Electrical System<br />
DC Electrical System<br />
AC Service<br />
Panel<br />
GBB<br />
Neutral<br />
SBJ<br />
GEC-AC<br />
GC<br />
AC<br />
N eutral<br />
EGC - AC<br />
<strong>MS</strong> <strong>Series</strong> Inverter/Charger<br />
Hot<br />
Grounding<br />
System<br />
Positive<br />
DC<br />
Negative<br />
GC<br />
AC Ground D C Ground SBJ<br />
EGC - DC<br />
GEC-DC<br />
DC Service<br />
Panel<br />
Negative<br />
GBB<br />
GE<br />
BC<br />
GE<br />
Grounding Electrode<br />
(AC side dedicated)<br />
Grounding Electrode<br />
(DC side dedicated)<br />
Figure 2-17, Multiple Connections to DC Ground Rod (Method 1)<br />
© 2009 <strong>Magnum</strong> <strong>Energy</strong> Inc.<br />
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