Eaton 9E - UPS System Interface Wiring Preparation; Table 3-8. Recommended Bypass and Output Circuit Breaker Ratings

UPS Installation Plan and Unpacking
3-10 Eaton 9E UPS (40–60 kVA, 208/220V) Installation and Operation Manual P-164000058—Rev 4 www.eaton.com/powerquality
The line-to-line unbalanced output capability of the UPS is limited only by the full load per phase current values
for AC output to critical load shown in Table 3-4. The recommended line-to-line load unbalance is 50% or less.
Bypass and output overcurrent protection and bypass and output disconnect switches are to be supplied by
the customer. Table 3-8 lists the recommended rating for bypass and output circuit breakers.
There is no manual DC disconnect device within the UPS.
Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC. Rated battery current is
computed based on 2 volts per cell.
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.
WARNING
Do not directly connect relay contacts to the mains related circuits. Reinforced insulation to the
mains is required.
Read and understand the following notes while planning and performing the installation:
l
Use Class 1 wiring methods (as defined by the NEC) for interface wiring up to 30V. The wire should be rated
for 24V, 1A minimum.
l
Use Class 2 wiring methods (as defined by the NEC) for interface wiring from 30V to 600V. The wire should
be rated for 600V, 1A minimum. 12 AWG maximum wire size.
l
Because of the REPO and building alarm wiring route in the UPS cabinet, the wire should be rated for a
minimum of 300V.
l
Use twisted-pair wires for each input and return or common.
l
All interface wiring and conduit is to be supplied by the customer.
l
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.
l
Interface wiring can be installed using conduit or by routing wiring through the power terminal cover base
wiring channels between the UPS and IAC-T, IAC-B or IAC-TB.
l
If using the power terminal wiring channel, keep interface wiring separate from power wiring or use shielded
wire.
l
If using conduit, install the interface wiring in separate conduit from the power wiring.
l
All building alarm inputs require an isolated normally-open contact or switch (rated at 24 Vdc, 20 mA
minimum) connected between the alarm input and common terminal. All control wiring and switch contacts
are customer-supplied.
Table 3-8. Recommended Bypass and Output Circuit Breaker Ratings
Output Rating
UPS Model Load Rating 208V
Eaton 9E-40
Eaton 9E–60/40
80% Rated 175A
100% Rated 150A
Eaton 9E–60/60 80% Rated 250A
100% Rated 200A