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Page 33

2012 Magnum Energy, Inc.

Installation

2.10 MMP/Inverter System Grounding

The MMP/inverter system uses both AC and DC electrical systems, therefore

each

electrical system

is required to be properly connected to a permanent, common “ground” or “earth” reference. A

MMP/inverter system that is properly grounded limits the risk of electrical shock, reduces radio

frequency noise, and minimizes excessive surge voltages induced by lightning. To understand how

the conductors in the electrical circuit will be connected to the system ground, the following terms

should be understood (also refer to Figure 2-16):
• Grounded

Conductor

(GC)

: The wire/cable in the electrical system that normally carries current

(usually the AC neutral and/or the DC negative), and is intentionally connected or “bonded” to

the ground system. This wire or the ends of this wire must 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 the grounded conductor. This wire or the

ends of this wire must be green, or green with a yellow stripe; or, 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 or common ground reference.

• 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.

There are two types of grounding – equipment grounding and system grounding.
The exposed metal parts of the equipment in the system usually don’t carry electricity. However, if

the exposed metal becomes electri

ed by a live wire, a person touching this live part could complete

the electrical circuit and receive a shock. Equipment grounding prevents shock by connecting all

the exposed metal parts of equipment (via Equipment Grounding Conductors – EGC) together

at a common ground point (Ground BusBar –

GBB

). This common ground point—installed in the

service disconnect panel for each electrical system (AC and DC)—is then connected (via Grounding

Electrode Conductor – GEC) to the common ground reference, such as a ground rod (Grounding

Electrode – GE). This connection to earth is made at only one point in each electrical system;

otherwise, parallel paths will exist for the currents to

ow. These parallel current paths would

represent a safety hazard and are not allowed in installations wired per the NEC/CEC.
System grounding takes one of the current carrying conductors (Grounded Conductor – GC) and

attaches it to the common ground point (Ground BusBar – GBB), usually by a System Bonding

Jumper (SBJ) in each electrical service disconnect panel. On the AC side, that is the neutral

conductor

(GC-AC)

;

on the DC side, it’s the negative conductor

(GC-DC)

. The closer the grounding

connection is to the source, the better the protection from high voltage surges due to lightning.

Figure 2-16, Grounding System for Inverter with MMP Enclosure

OURCE

AIN