LEGRAND NUMERIC HPi 33 EVO User Manual page 9

3.5 External Protective Devices
For safety reasons, it is necessary to install, external circuit breaker at the input A.C. supply and the
battery. This chapter provides guidelines for qualified installers that must have the knowledge of local wiring
practices for the equipment to be installed.
External Battery
•
The UPS and its associated batteries are protected against the effect of over-current through a DC compatible
thermo-magnetic circuit-breaker (or a set of fuses) located close to the battery.
UPS Output
•
Any external distribution board used for load distribution shall be fitted with protective devices that may
avoid the risk of UPS overloaded.
Over-current
•
Protection device shall be installed at the distribution panel of the incoming main supply. It may identify the
power cables current capacity as well as the overload capacity of the system.
3.6 Power Cables
The cable design shall comply with the voltages and currents provided in this section, Kindly follow local
•
wiring practices and take into consideration the environmental conditions (temperature and physical support
media) .
Upon starting, please ensure that you are aware of the location and operation of the external isolators which
are connected to the UPS input/bypass supply of the mains distribution panel. Check to see if these supplies are
electrically isolated. Take note of necessary warning signs to prevent any inadvertent operation.
For future expansion purpose, it is economical to install power cable according to the full rating capacity
•
initially. The diameter of cable is shown bellow:
UPS cabinet
10kVA
20kVA
30kVA
40kVA
Protective earth cable: Connect each cabinet to the main ground system. For Grounding connection, follow the
shortest route possible.
Failure to follow adequate earthing procedures may result in electromagnetic interference or lead to hazards
involving electric shock and fire
AC Input (mm2) AC Output (mm2)
6
16
16
25
WARNING!
Cable Dimension
DC Input (mm2)
6 10
10 25
16 25
16 35
CAUTION!
WARNING!
Grounding (mm2)
6
6
10
10
9