Electrical Connections—UPS
15
Liebert
®
e
XM
™
3.0
E
LECTRICAL
C
ONNECTIONS
—UPS
The UPS requires both power and control cabling once it has been mechanically installed. All control
cables must run separate from power cables in metal conduits or metal ducts that are electrically
bonded to the metalwork of the cabinets to which they are connected.
3.1
Power Cabling
3.1.1 Lug Size and Cable Rating
The main factors affecting the choice and size of cable are voltage, current (also taking into account
overcurrent), room temperature and conditions of installation of the cable. Refer to ANSI/NFPA 70.
The power cables of the system must be sized with respect to the following description:
•
UPS input cables
- The UPS input cables must be sized for the maximum input current,
including the maximum battery recharge current, given in
Table 23
, with respect to the unit
rating and the input AC voltage.
•
UPS bypass and output cables
- The bypass and output cables must be sized for the nominal
output current, given in
Table 23
, with respect to the unit rating and the output AC voltage.
•
Battery cables
- See the Liebert
e
XM External Battery Cabinet manual, SL-25651, for battery
installation guidelines and instructions. The manual ships with the battery cabinet and is
available at Liebert’s Web site:
www.liebert.com
The power cables can be sized to suit the UPS unit rating according to
Table 23
.
!
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Before connecting input power to the Liebert
e
XM, ensure that you are aware of the location
and operation of the overcurrent protection devices that connect the UPS input/bypass supply
to the power distribution panel.
De-energize and lockout or tagout all incoming high- and low-voltage power circuits before
installing cables or making any electrical connections.
!
AVERTISSEMENT
Risque de décharge électrique pouvant entraîner des dommages matériels, des blessures et
même la mort.
Avant de procéder au branchement de l'alimentation d'entrée du système eXM de Liebert,
veillez à prendre connaissance de l'emplacement et du fonctionnement des dispositifs de
protection de surintensité qui raccordent l'alimentation d'entrée ou de dérivation du système
ASC au panneau de distribution électrique.
Coupez l'alimentation et appliquez le verrouillage ou l'étiquetage à tous les circuits
d'alimentation haute tension et basse tension avant d'installer les câbles ou d'effectuer tout
autre branchement électrique.
NOTE
Table 23
gives nominal currents for determining the size of UPS power cables. Other
important factors to consider include cable route length and coordination with protective
devices.
Summary of Contents for Liebert eXM
Page 1: ...Liebert eXM User Manual 60 100kVA 50 60Hz ...
Page 2: ......
Page 8: ...vi ...
Page 89: ...Maintenance 81 Liebert eXM NOTES ...
Page 90: ...Maintenance Liebert eXM 82 ...
Page 91: ......