UT340, UT360, UT380, and UT3100
Planning and Installation Manual
19
DANGER!
6.
Do not connect the battery terminal to ground (earth). If any battery terminal is
inadvertently grounded, remove the source of the ground. Contacting any part of a
grounded battery can cause a risk of electric shock.
7.
To reduce the risk of fire or electric shock, install the batteries in a temperature and
humidity controlled indoor area, free of contaminants.
8.
Battery system chassis ground (earth) must be connected to the UPS chassis ground
(earth). If you use conduit, this ground conductor must be routed in the same conduit as
the battery conductors.
9.
Where conductors may be exposed to physical damage, protect the conductors in
accordance with all applicable codes.
10. If you are replacing batteries or repairing battery connections, shut off the UPS and
remove both AC and DC power.
Follow these guidelines when installing the batteries:
Refer to any instructions provided with the batteries.
Refer to any instructions provided with the DC disconnect (DCD) and pre-charge/discharge
switch.
External batteries require a fused disconnect or a DC circuit breaker. There should be a
disconnecting means for each battery string. The external battery fuse protects the battery
cables. Size the cables based on the overcurrent protection device.
The battery cables must be sized for a total maximum voltage drop of 2.0 VDC at the rated
DC current.
Wherever conductors may be exposed to physical damage, protect the conductors in
accordance with any applicable codes. This includes battery cables between the UPS and the
battery system and cables between battery cabinets or racks.
BEST recommends routing battery cables through flexible conduit. Install flexible conduit
for battery cables according to local or national code.
The battery system ground (earth) must be connected to the UPS chassis ground (earth). This
ground conductor must be routed with the battery cables.