FireClass Panels and Repeaters Connecting the mains cable and protective earths in FC600 series panels and AC repeaters
Installation Guide Doc. version 2.0 12
To connect the Mains cable and protective earth,
complete the following steps:
1 Make sure the Mains cable is not connected to the
supply, or that the supply is isolated.
2 On the PSU, locate the Mains connector at the top
of the unit. If the protective cover is fitted to this con-
nector, remove it.
3 Connect the Mains cable to its connector. Fix the
Mains cable using the clip near the Mains connector.
4 Connect the protective earth conductor of the Mains
to a terminal of the housing earthing point.
5 Particularly in harsh environments, it may be neces-
sary to connect an additional low resistance earth-
conductor to the solid earth bar in the closest distri-
bution unit (stranded wire > 2.5 mm
2
).
NOTE: Earthing through the mains distribution may
not provide the best path for HF currents.
NOTE: Most AC power distribution systems will
include a low impedance protective earth; however
IT power distribution systems either have no earth
or high impedance to earth. In these cases, a local
low impedance protective earth is required.
6 Re-fit the PSU Mains connector cover.
7 Make sure system 0 V is not connected to the earth,
as there is an earth fault monitoring circuit.
DANGER
The FireClass panel contains high
voltages, producing a danger of death or
serious injury.
You must ensure adequate earthing of
the system.
In addition to any earthing requirements
in the local regulations, additionally you
must, also follow these stipulations:
All exposed metalwork and cabling
conduits must be returned to earth at
the control panel.
The control panel housing must be
earthed, following the procedures as
mentioned in this guide.
WARNING
Particularly in harsh environments, to
ensure proper operation of the control
panel, a second earth, separate from
the mains lead earth, must be installed.
This is described in the following
section.
Fig. 8: PSU Mains Connector Cover (detail)
1–Cover
2– PSU Mains connector
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