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• The metal chassis of the AC load(s) is connected to the Grounding Bus Bar (G-B) of the Electrical Sub Panel for
EVO™ Output
• Grounding Bus Bar (G-B) of the Electrical Sub Panel for EVO™ Output is connected to metal chassis of EVO™
through the “OUTPUT GND” Terminal (25) of the AC Input / Output Terminal Block (20) in EVO™.
• The metal chassis of EVO™ is connected to the “GRID GND” Terminal (22) of the AC Input / Output Terminal
Block (20) in EVO™
• The “INPUT GND” Terminal (23) of the AC Input / Output Terminal Block (20) in EVO™ gets connected to the
Grounding Bus Bar (G-B) in the Electrical Panel of the RV / vehicle through the grounding wire of AC input
connection
• The Grounding Bus Bar (G-B) in the Electrical Panel of the RV / vehicle is bonded to the RV / Vehicle Chassis
Ground. When the RV / vehicle is connected to the Grid through the Grid Power Inlet and Cord, the RV /
Vehicle Chassis Ground gets bonded to the Earth Ground of the premises through the Grounding Electrode
(GE) / “Ground Rod” of the premises of the Grid Power System supplying the RV / Vehicle
• Thus, in keeping with the NEC requirements, the AC Grounds of EVO™ and the Grid Electrical Panel
will be bonded to the Earth Ground only at one single point at the Grid Electrical Panel feeding the
EVO™.
3.14.4 Switching Of Bonding Of Output Neutral To Chassis Ground
As required by NEC and UL Standard 458, automatic switching of bonding between the Output Neutral and Chassis
Ground has been provided in EVO™ through “Output Neutral and Chassis Ground Bond Switching Relay” (RY2 in Fig
4.1). Switching is carried as follows:
• When operating as an inverter, the current carrying conductor of the Inverter Section that is connected to the
Output Neutral terminal of the EVO™ is bonded to the metal chassis of EVO™ by the “Output Neutral to Chassis
Ground Bond Switching Relay” (RY2 in Fig 4.1). As the metal chassis of EVO™ is in turn bonded to the Earth
Ground (in shore installations) or RV Ground (chassis of the RV) or to the Boat Ground (DC Negative Grounding
Bus Bar and the Main AC Grounding Bus Bar are tied together in a boat and this is called the “Boat Ground”),
this current carrying conductor of the Inverter Section (connected to the Output Neutral Terminal) will become the
Grounded Conductor (GC) or the Neutral of the Inverter Section.
• When in Charging Mode, the Neutral conductor of the Grid power will be connected to the Output Neutral
terminal of EVO™. At the same time, the “Output Neutral to Chassis Ground Bond Switching Relay” (RY2 in Fig
4.1) will unbond (disconnect) the Output Neutral connector of EVO™ from the metal chassis of EVO™. This will
ensure that the Grounded Conductor (GC) i.e. the Neutral of the Grid power is bonded to the Earth Ground at
one single point at the location of the AC Power Distribution System of the Marina / RV Park / Shore Power.
• Disabling Neutral to Ground Bond: In some applications, the Output Neutral of EVO™ may be required
to remain isolated from the chassis/Ground at all times. For this, automatic Ouput Neutral to Chassis Ground
bond can be disabled by disconnecting the Insulated Male/Female Quick Disconnect located in the AC wiring
compartment. [Please see (i) 27, Fig 3.9.2(a) and (ii) "27" in Figs 4.1].
Please read the following on-line White Papers for more details at www.samlexamerica.com
(Home > Support > White Papers):
- “Neutral to Ground Switching in RV and Marine Applications
SECTION 3 | Installation
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