Disabling Neutral Ground Switching; Figure 9, Disabling Neutral-To-Ground Switching - Trace Engineering LEGEND II Manual

If no neutral to ground switching were employed in an inverter there would be one neutral tied to the
AC sub-panel and the other neutral to the vehicle or chassis ground. The two different ground points
would now form a current carrying conductor with the vehicle chassis acting as the "wire" between
the two different ground points. This means any ground point in the vehicle becomes a potential
current careering conductor, which could result in electrical shock. This ground loop could also be a
cause for nuisance tripping of any GFCI's (Ground Fault Circuit Interrupter).

Disabling Neutral Ground Switching

Legend inverters employ neutral-to-ground switching. In countries such as Canada this may be
utilized, and therefore may need to be disabled before installation. Check local code if you are not
sure whether you must disable the neutral ground switching feature.
Note: Connect the chassis ground to the vehicle chassis even if ground switching has been disabled.
Disabling the ground switching is very simple if precautions are taken and these steps followed:
1. If the inverter is already installed, disconnect any AC sources (If any are present)
2. Disconnect the battery(s) from the inverter.
3. Remove the AC terminal block cover on the front of the inverter.
4. Locate the green wire that runs from the circuit board to the chassis ground bolt as shown
in the figure below. Cut this wire and wrap the cut end with insulating tape.
Cut the green wire here
(Neutral to Ground Wire
on mobile units only)

Figure 9, Disabling Neutral-to-Ground Switching

WK
Chassis ground bolt