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Battery Installation
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2.4.2 Fitting the Batteries
1. In general, at least 10mm (3/8") must be left unobstructed on all vertical sides of the battery
blocks to permit free air movement around the cells.
2. Clearance should be allowed between the top of the cells and the underside of the shelf above (this
is necessary for monitoring and servicing the cells).
3. When installing the batteries on racks always work from the bottom shelf upwards to prevent
raising the centre of gravity.
2.4.3 Connecting the Battery
1. When the battery cabinet is installed on a raised floor the battery power cables and optional circuit
breaker control cables can be routed to the UPS cabinet via the floor of the cabinet. If the UPS and
battery cabinet are located adjacent to each other and located on a solid floor these cables can be
passed between the cabinets via the lifting apertures located in the lower sides of the cabinets.
2. In general it is recommended that the inter-connecting cables be fitted to the batteries within
their particular level before fitting the inter-level connecting cables, followed finally by the cables
to the circuit breaker.
3. An insulating shroud should be fitted to each terminal after its connection has been made.
4. When connecting the cables between the battery string ends to the optional circuit breaker always
connect the circuit breaker end of the cable first.
2.4.4 Battery Room Design
Whatever the type of mounting system selected, the following conditions should be noted:
• Cell Layout—1
Whichever battery mounting system is used, the batteries should be arranged to prevent the pos-
sibility of simultaneous contact with two exposed live parts having a potential greater an 150V.
Where this is not possible, insulated terminal shields must be installed and insulated cables must
be used for connections.
• Service Platform—2
The service platform (or duckboard) must be slip-proof, insulated from the floor and at least one
metre (39 in.) wide.
• Connections—3
All connections must be as short as possible.
• Battery Protection Fuses/Circuit Breaker—4
The battery circuit breaker is generally installed at the front of the battery room. See 2.5 - Bat-
tery Control for details on connecting the circuit breaker box available for the Liebert NX.
Figure 12 Battery room design
2.5 Battery Control
Battery temperature sensor cables are connected between UPS auxiliary terminal block X3 BCB, the
Battery Temperature sensor and the battery as shown in Figure 7.
Cables connected to X3 BCB must contain a protective earth wire or a shield, be segregated from
power circuits, double insulated and of a typical 0.5 to 1mm2 cross section area for maximum runs
between 25 and 50 meters respectively. The shield should be connected to the protective earth of the
battery cabinet or battery breaker, not at the UPS
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