- the maintenance bypass and the UPS, or
- the maintenance bypass and the rectifier input breaker.
If a bypass input breaker is installed in the maintenance bypass and a single-
feed UPS is being installed., a single feed to the maintenance bypass is
acceptable for supplying both the UPS and the bypass.
An additional single feed kit (P-103002165 KIT 93PS-20 SINGLE FEED) is
available for the 8–20 kW cabinet. Maximum conductor cross section of the
single feed is 35 mm
2
.
When you plan and perform the installation, read and understand the following
notes:
• Refer to the national and local electrical codes for acceptable external wiring
practices.
• To allow for future kVA upgrades (software and/or hardware), consider using
conductors that are sized for the full bypass rating of the UPS.
• Material and labor for external wiring requirements must be provided by
designated personnel.
• For external wiring, use copper cable rated for 70 °C at minimum. See the
appropriate information in Table
8
. Cable sizes are based on using the
specified breakers.
• If cables are run in an ambient temperature greater than 30 °C, higher
temperature cable and/or larger size cable may be necessary.
• The bypass feed into this equipment uses four cables. The rectifier feed into
this equipment uses three or four cables. The phases must be symmetrical
about ground (from a Wye source) for proper equipment operation.
• If the load requires a neutral, a bypass source neutral must be provided. If
the load does not require a neutral and there is no neutral conductor
connected at the bypass input, a neutral must be installed to source star
point.
• A readily accessible disconnect device must be incorporated in all fixed input
wiring.
WARNING
Do not disconnect the bypass neutral without disconnecting the bypass
phases at the same time.
Table 8: Minimum recommended multi-core cable and fuse sizes for rectifier and bypass
input and UPS output cables
UPS rating (kW)
8
10
15
20
30
40
Cable [mm
2
]*
4*2.5
4*4
4*10
4*10
4*16
4*25
Rectifier fuse [A]
20
20
32
40
63
80
Bypass fuse [A]
20
20
32
40
63
80
Eaton 93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2016. All rights reserved.
Revision: 003
Document ID: P-164000493
39 (104)
