Safety Earth; Protective Devices - Powertronix Quasar Service Manual

Service Manual

2.2.3 - Safety Earth

The safety earth bus bar is located near the UPS output terminals. The safety earth cable must be con
nected to the earth terminal and bonded to each cabinet in the system.
All cabinets and cable trunking must be earthed in accordance with local regulations.
WARNING
FAILURE TO FOLLOW ADEQUATE EARTHING PROCEDURES CAN RESULT IN ELECTRIC
SHOCK HAZARD TO PERSONNEL, OR THE RISK OF FIRE, SHOULD AN EARTH FAULT
OCCUR.
BEFORE ANY OTHER CABLE CONNECTION THE PE SAFETY CONDUCTOR SHALL BE
CONNECTED

2.2.4 - Protective devices

Protection against earth faults (RCD devices):
In the event of a differential (RCD) device being installed upstream of the input supply, the transient and
steady state earth leakage currents that are produced during start up of the UPS must be taken into ac
count.
The presence of an RFI suppression filter inside the UPS, determines a residual earth current no greater
than 500 mA.
Residual current circuit breakers (RCCB) must be sensitive to d.c. unidirectional pulse (class A) in the
mains and insensitive to transient current pulses.
3x3 UPS Installation
Issue 2 - November 2001
Chapter 2 - Installation
Installation (Electrical)
2 - 5