Eaton 9395 - 2-Hole Barrel Lug Terminations to Bus Bar Installation; Figure 4-3. Typical Bus Bar Barrel Lug Mounting - Hardware Assembly Sequence

UPS SYSTEM INSTALLATION
Eaton 9395 UPS (225–275 kVA) Installation and Operation Manual S 164201683 Rev 3 www.eaton.com/powerquality
4-6
C A U T I O N
DELTA SOURCES (TN‐S) - The UPS system can be operated only from a delta supply source that is fully
floating and if the neutral‐forming transformer kit is installed in the UPS. 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.
Use the procedures in the following paragraphs to connect the external and battery
power wiring.
4.6.1 2‐Hole Barrel Lug Terminations to Bus Bar Installation
Paragraphs 4.6.2 and 4.6.3 require connecting input, output, and battery power wiring
using 2-hole barrel lugs. See Figure 4‐3 for the hardware sequence when installing the
lugs to the bus bars. Tighten the nut to the torque value listed in Table 3‐7.
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.
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
Figure 4‐3. Typical Bus Bar Barrel Lug Mounting – Hardware Assembly Sequence