Ups System Interface Wiring Preparation; Table 3-9. Recommended Dc Input Circuit Breaker Rating - Eaton 9E Installation And Operation Manual

UPS Installation Plan and Unpacking
There is no DC disconnect device within the UPS. A battery disconnect switch is recommended, And may be
required by local codes when batteries are remotely located. The battery disconnect switch should be installed
between the battery and the UPS
External DC input overcurrent protection and disconnect switch for the remote battery location is to be
provided by the user. Table 3-9 lists the maximum rating for continuous-duty rated circuit breakers satisfying the
criteria for both.

Table 3-9. Recommended DC input circuit breaker rating

Battery voltage is computed at 2 volts per cell. Rated battery current is computed at 2 volts per cell. The battery
wiring used between the battery and the UPS should not allow a voltage drop of more than 1% of nominal DC
voltage at rated battery current. If the conductors used for DC input from the battery cabinets to the UPS are
those provided by the UPS manufacturer, and the UPS and battery cabinets are manufactured by the same
supplier, then it is acceptable if they do not meet the noted minimum conductor sizes.

3.2.3 UPS System Interface Wiring Preparation

Control wiring for features and options should be connected at the customer interface terminal blocks located
inside the UPS.
Do not directly connect contactor contacts to the mains related circuits. Reinforced insulation is
required before connecting to the mains.
Read and understand the following notes while planning and performing the installation:
• Interface wiring should be rated for 24V, 1A minimum.
• For interface wiring from 30V to 600V,The wire should be rated for 600V, 1A minimum.
• Because of the REPO and building alarm wiring route in the UPS cabinet, the wire should be rated for a
minimum of 300V.
• Use twisted-pair wires for each input and return or common.
• All interface wiring and conduit is to be supplied by the customer.
• When installing external interface wiring between a REPO or building alarm and the UPS interface terminals,
conduit must be installed between each device and the UPS cabinet.
3-10 Eaton 9E UPS (80-200 kVA, 380/400/415V) Installation and Operation Manual
UPS Model
Eaton 9E-100/80
Eaton 9E-100/100
Eaton 9E-120/120
Eaton 9E-200/160
Eaton 9E-200/200
Circuit Breaker Rating
Load Derating Rated battery voltage (480V, 40 sections)
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
WARNING
209A
167A
260A
208A
313A
250A
416A
333A
521A
417A