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Remove the knock-out hole in the terminal block cover for the input conduit. The hole must
3
accommodate 1" or 1.5" (25.4 mm or 38.1 mm) Intermediate Metal Conduit (IMC).
Pull the input wire through the conduit, leaving approximately 2 ft (0.5m) of exposed wire. Attach
4
a flexible metal fitting to the end of the conduit.
Insert the conduit through the wiring access entry and attach the conduit fitting to the panel.
5
Strip 0.5" (1.5 cm) of insulation from the end of each incoming wire.
CAUTION:
If the UPS does not have an automatic protection device against current backfeed, install an
external isolating device (see Figure 21). After the device is installed, you must add a warning label with the
following wording or the equivalent on the external AC contactor: RISK OF VOLTAGE BACKFEED. Isolate the
UPS before operating on this circuit, then check for hazardous voltage between all terminals.
External Distribution Panel
Q
L/L1
N/L2
Figure 21. Typical External Isolating Device Installation
|
30
Installation
T
L/L1
N/L2
B
Legend
B
Q
T
N/L2
L/L1
UPS
Coil Remote Switch
Magneto-Thermal Input Main Switch
AC Contactor ( see Table 1)
Neutral/L2
L1 Line Input
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