Vertiv Liebert EXM - 3.0 ELECTRICAL CONNECTIONS-UPS; 3.1 Power Cabling

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 19
3.0 ELECTRICAL CONNECTIONS—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. All control
cabling must be shielded.
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 Tables 16, and 17 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 Tables 18 and 19, with respect to the unit rating and the output AC voltage.
• Battery cables - See the Liebert
®
EXM
™
External Battery Cabinet manual, SL-25656, for battery
installation guidelines and instructions. The manual ships with the battery cabinet and is available at
Liebert’s Web site: www.vertivco.com
The power cables can be sized to suit the UPS unit rating according to Table 16.
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Before connecting input power to the Liebert
®
EXM
™
, 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 16 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.