UPS model Minimum short circuit
current, AC ports [A]
Minimum short circuit
current, battery port [A]
93PS-15 320 500
93PS-20 400 500
93PS-30 630 1000
93PS-40 800 1000
91PS-8 500 500
91PS-10 630 500
91PS-15 800 500
91PS-20 1000 1000
91PS-30 1600 1000
Table 17: Minimum recommended cable and fuse sizes for external battery bank
UPS rating (kW) 8 10 15 20 30 40
Pos. & neg. line [mm
2
]* 1*16 1*16 1*16 1*16 1*35 1*35
Battery fuse [A] 63 63 63 63 160 160
PE cable [mm
2
] 1*16 1*16 1*16 1*16 1*16 1*16
Maximum conductor
cross section
20 kW frame, 20 kW C-model and 40 kW frame with sepa-
rate battery: solid wire: 25 mm
2
, stranded wire with ferrule:
16 mm
2
40 kW frame with common battery: solid wire: 90 mm
2
,
stranded wire with ferrule: 70 mm
2
* Minimum recommended
NOTE: UPS power upgrading is possible only if the sizing of the external cables
is sufficient. Alternatively, the external cabling must be upgraded as well. Fuses
are of the type gG.
Cable sizing is based on the standard IEC 60364-5-52 table B.52.2 and IEC
60364-5-54 table B.54.2. Sizing is for 70 ºC rated copper cables.
When you connect external batteries to 91PS/93PS UPS, Eaton recommends
that you use the following NZM series molded case circuit breakers.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 45 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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