Grounding Inverters; Figure 2-10, Grounding System For Msh-Re - Magnum Energy MagnaSine Hybrid Owner's Manual

2.6

Grounding Inverters

The inverter/charger should always be connected to a permanent, grounded wiring system. A
properly grounded system limits the risk of electrical shock, reduces radio frequency noise from
the inverter, and minimizes excessive surge voltages induced by lightning. Ensure there is a
well-defi ned, low-resistance path from the electrical system to the grounding system. The low-
resistance path helps stabilize the electrical system voltage with respect to ground and carries
fault currents directly to ground if the electrical system malfunctions. Review the following terms
to understand how the conductors in the electrical circuit will be connected to the system ground:
• Grounded Conductor (GC): The wire/cable in the electrical system that normally carries
current (usually AC neutral and/or DC negative), and is intentionally connected or "bonded"
to the ground system. This wire, or the ends of this wire, should be colored white or gray.
• Equipment Grounding Conductor (EGC): A wire/cable that does not normally carry current
and is used to connect the exposed metal parts of equipment—that might be accidentally
energized—to the grounding electrode system or to the grounded conductor. This wire, or the
ends of this wire, should be green or green with a yellow stripe; this wire can be bare copper.
• Grounding Electrode Conductor (GEC): The wire/cable that does not normally carry
current and connects the grounded conductor and/or the equipment grounding conductor to
the grounding electrode at the service equipment.
• Grounding Electrode (GE): A ground rod or conducting element that establishes an electrical
connection to the earth.
• System bonding jumper (SBJ): The connection between the grounded circuit conductor in
the electrical system and the equipment grounding conductor at a separately derived system.
The MSH-RE Series inverter/charger uses both AC and DC power; however, the AC electrical
system is isolated from the DC electrical system by an internal transformer. Although this
inverter/charger has two electrical systems, each electrical system must be properly grounded
and connected to a common "earth" reference. Refer to Figure 2-10.
For proper grounding, each electrical system must connect all exposed metal parts of equipment
(via EGC) and one of the current-carrying conductors (GC) together at a common point (ground
busbar–GBB), usually by a system bonding jumper (SBJ) in an electrical service disconnect panel.
The common point of each electrical system is then connected (via GEC) to the common ground
reference, such as a ground rod (GE). This connection to earth should only be made at one
point in each electrical system; otherwise, parallel paths will exist for the currents to fl ow. These
parallel current paths would represent a safety hazard and are not allowed in installations wired
per the NEC/CEC.
AC Service
GBB
© 2013 Magnum Energy, Inc.
AC Electrical System
MSH-RE Series Inverter/Charger
Panel
Hot
AC
Neutral
GC
Neutral
SBJ
AC Ground
EGC
GEC-AC
or
GE
Grounding Electrode Grounding Electrode
(AC side dedicated) (AC and DC sides shared)

Figure 2-10, Grounding System for MSH-RE

DC Electrical System
Positive
DC
GC
Negative
DC Ground
Grounding
EGC
System
GEC-DC
GE
GE
Grounding Electrode
(DC side dedicated)
Installation
DC Service
Panel
Negative
SBJ
GBB
or
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