Cable Connections; Safety Earth; Protective Devices - Liebert 7200 Series User Manual

7200 Series UPS User Manual
Single Module and 1+1 Parallel System
Sheathed cables
clipped direct to
or lying on a
non-metallic
surface.
3.3.3

Cable connections

The input mains/bypass cables, UPS output cables and battery cables ( all require lug type terminations
) are connected to busbars situated between the power isolator switches - as shown in figure 3-5. A
terminal block X3 is used for connecting the control cables to the battery circuit breaker and the
external emergency stop facility, these are female spade type connections ( Fast-on 6,3x0,8 ).
3.3.4

Safety earth

The safety earth bus-bar is located near the input and output power supply connections as shown in the
following diagram. The safety earth cable must be connected to the earth bus-bar and bonded to each
cabinet in the system.
All cabinets and cable trunking should be earthed in accordance with local regulations.
FAILURE TO FOLLOW ADEQUATE EARTHING PROCEDURES CAN RESULT IN ELECTRIC SHOCK
HAZARD TO PERSONNEL, OR THE RISK OF FIRE, SHOULD AN EARTH FAULT OCCUR.
3.3.5

Protective devices

Bypass input of UPS is not self-protected against overloads or shorts circuits: it's necessary to install
in distribution panel a circuit breaker or fuses to protect bypass line.
Rectifier input: it's the same, in case of separate rectifier input, it's necessary to install in distribution
panel another circuit breaker or fuses to protect input wires.
The UPS is fitted with RFI suppression filters, earth leakage current exceeds 3.5 mA and is less than
500 mA.
Earth leakage current of loads will add when UPS is operating from bypass supply.
Residual Current Circuit Breakers ( RCCBs ) must be selected insensitive to DC unidirectional pulses
( class A ) and transient current pulses.
They are identified by the symbols
Output of UPS: an insulator switch may be inserted in distribution panel for maintenance purpose; be
sure don't use a protective device for the whole output power of UPS, in particular don't use RCCB.
Protective devices may be used for distribution lines to loads, be sure that they are selective with
protecting devices in input of UPS.
document in response to "powersure ups"
Figure 3-C . Cable fixing samples from method 1
WARNING
Chapter 3 - Installation Procedure
Connecting the UPS power cables
Page 3-7
Issue 6
(03/98)