Orbit Behlman INV-1200 Series User's Manual And Technical Reference Manual page 10

! CAUTION
FAILURE TO OBSERVE DC POLARITY ON THE INPUT TO THIS DEVICE MAY CAUSE DAMAGE TO
INTERNAL CIRCUITRY. THIS WILL VOID EQUIPMENT WARRANTY
FIGURE 2-1, INV1200 WIRING WITHOUT BYPASS OPTIONS
Units supplied with the AC input bypass option will be wired slightly differently. To conform to
NEC 250 the neutral is "carried through" to the output but is not shorted to the GND terminal.
When supplied from the inverter, (not in bypass) the low or neutral terminal is floating with respect
to earth. This situation does not meet the requirements of NEC section 250 regarding "separately
derived AC source". To allow compliance with NEC rules, an additional "common" terminal is
provided at the rear panel. Attaching a short between the inverter common and earth will satisfy
this requirement. This is also recommended for overall safety. It should be noted that this is only
required to satisfy the NEC rules. The output of the inverter is isolated from the DC input and the
line. This allows the output to be floating if required by end user's application. Maximum
continuous common mode potential is limited to 250VAC or 360VDC. Figure 2-3 illustrates a
typical bypass configuration.
MNL940-677-000 REV - B 3/20/2017
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