Technical Manual
GE Reason H49
42
H49/EN M/C22
6.2
Earth Wiring
6.2.1
Protective Earth Wiring
This equipment requires a protective conductor (earth) to ensure user safety
according to the definition in the standard IEC 60255-27: 2005 Insulation Class 1.
Warning:
– To preserve the device's safety features, the protective conductor (earth)
MUST not BE disturbed when connecting or disconnecting functional earth
conductors, such as cable screens, to the PCT stud.
– The protective conductor must be connected first, in such a way that it is
unlikely to be loosened or removed during installation, commissioning or
maintenance. This MAY be achieved by use of an additional locking nut.
Caution:
Always place the protective conductor (earth) as shown on the diagram
below.
Figure 20: Protective Earth Screw
The protective conductor (earth) must be as short as possible, with low impedance.
The best electrical conductivity must be maintained at all times, particularly the
contact resistance of the plated steel stud surface.
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