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System Configuration
2–8 976-0043-01-01
Equipment or Chassis Grounding
This grounding connects the metallic chassis of the various enclosures
together to have them at the same voltage potential. This reduces the
possibility for electric shock. It also provides a path for fault currents to
flow through to blow fuses or trip circuit breakers. The size of the
connecting conductors should be coordinated with the size of the over-
current devices involved. Under some circumstances, the conduit and
enclosures themselves will provide the current paths.
Grounding Electrodes/Ground Rods
The purpose of the grounding electrode (often called a ground rod) is to
“bleed” off any electrical charge that may accumulate in the electrical
system and to provide a path for “induced electromagnetic energy” or
lightning to be dissipated. The size for the conductor to the grounding
electrode or grounding system is usually based on the size of the largest
conductor in the system. Most systems use a copper-plated rod as the
Table 2-1 Recommended Minimum Safety Ground Wire and DC
Disconnect Sizes per NEC
Battery DC
Disconnect Size Minimum Size of
Copper Ground Wire
30 amp or 60 amp #10 AWG
100 amp #8 AWG
200 amp #6 AWG
300+ amp #2 AWG or greater
Note:
Field experience has demonstrated that long distances or high
impedance grounds can cause equipment malfunction or damage.
WARNING: Explosive Hazard
Never use a gas pipe or gas line for grounding purposes. The
inverter is a power source and it is intended to be grounded at
the service/main ground rod.
WARNING: Shock Hazard
Attach the ground lead BEFORE attaching AC or DC
power connections.