70 Eaton Power Xpert 9395 UPS Installation and Operation Manual 164201725—Rev 15
HIGH IMPEDANCE GROUND SOURCES - If the supply source is a high impedance ground (IT) type, the input
neutral conductor must be connected from the source of supply. If there is no output neutral connected to the
UPS, the neutral–forming transformer kit may be used instead of pulling a neutral from the source. If the load
requires a neutral, then an input neutral conductor must be pulled into the UPS. In no circumstances shall a
neutral to ground bonding jumper be installed in the UPS.
DELTA SOURCES (TN-S) - The UPS cannot be operated from a mid-point or end-point grounded delta supply
source. With this type of supply source, there is no capability to provide an output neutral. In no circumstances
shall a neutral to ground bonding jumper be installed in the UPS.
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Paragraphs 4.8.2 External Power Wiring Installation and 4.8.3 Battery Power Wiring require connecting input,
output, and battery power wiring using 2-hole barrel lugs. See Figure 38 for the hardware sequence when
installing the lugs to the bus bars. Tighten the nut to the torque value listed in Table 13.
NOTE Conical washers are special purpose washers that look similar to flat washers, except
for a slight conical shape. When installing conical washers, the top of the dome should
be next to the nut and the base of the washer should be against a flat surface such as a
bus bar, flat washer, or large terminal.
Figure 38. Typical Bus Bar Barrel Lug Mounting – Hardware Assembly Sequence
Hex Nut
Conical Washer
Lug
Bus Bar
Flat Washer
Bolt Head
Lug
Flat Washer
Hex Nut
Conical Washer
Lug
Bus Bar
Flat Washer
Bolt Head
Flat Washer
Single Lug Installation
Double Lug Installation
UPS System Installation
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