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Making the electrical connection Chapter 5
Installing the IED
Figure 16: Board with male connectors
Figure 17: Connected cables with ferrules.
4.4 Connecting to protective earth
Connect the earthing screws on the rear of the IED unit to the closest possible earthing point in
the cubicle. Electrical codes and standards require that protective earth cables are green/yellow
conductors with a cross section area of at least 2.5 mm
2
(AWG14). There are several protective
earthing screws on an IED. The Power supply unit, Transformer modules and the enclosure are
all separately earthed, see figure 18
below.
Where:
1 is ferrule
1
xx01000050.vsd
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