9
2-5 AC Safety Grounding
During the AC wiring installation, AC input and output ground wires are connected to the
unit. The AC input ground wire must connect to the incoming ground from your AC utility
source.
The AC output ground wire should go to the grounding point for your loads (for example,
a distribution panel of bus chassis).
2-5-1 Neutral grounding (GFCI
’
s)
2-5-1.1
120V Models:
The neutral conductor of the AC output circuit of the unit is automatically
connected to the safety ground during unit operation. This conforms to
national electrical code requirements that separately derived AC sources
(such as inverter and generators) have their neutral conductors tied to
ground in the same way that the neutral conductor from the utility is tied
to ground at the GFCI breaker panel. For models configured with a
transfer relay, while AC utility power is presenting and the inverter is in
bypass mode, this connection (neutral of the unit
’
s AC output to input
safety ground) is not present so that the utility neutral is only connected
to ground at your breaker panel, as required.
2-5-1.2
230V Models:
There is no connection made inside the unit from either the line or
neutral conductor to the safety ground.
Ground Fault Circuit Interrupters (GFCI
’
S):
Installations in Recreational Vehicles (for North American approvals) will require
GFCI protection of all branch circuit connected to the AC output of the hardwire
terminal equipped unit. In addition, electrical codes require GFCI protection of
certain receptacles in residential installations. While the pure sine wave output of
the unit is equivalent to the waveform provided by utilities, compliance with UL
standards requires us to test and recommend specific GFCI. Our company has
tested the following GFCI-protected 20A receptacles and found that they
functioned properly when connected to the output of the unit.
WARNING!
Do not operate the unit without connecting it to Ground.
Electrical shock hazard may result.
