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Installation and Operating Instructions
Figure 3. TN-S system: In this system, a separate neutral and protective earth conductor are run
throughout. The protective PE conductor can be the metalic sheath of the power distribution cable or separate conduc-
tor. All exposed conductive parts of the installation are conducted to this PE conductor.
Figure 4. TN-C-S system: In this system, a separate neutral and protective earth functions combine in a single PEN
conductor. This system is also known as a Multiple Earthed (MEN) system and the protective conductor is referred to as
the combined neutral earth (CNE) conductor The supply PEN conductor is earthed at a number of points throughout the
network and generally as close to the consumer 's point of entry as possible. All exposed conductive parts are connected to
the CNE conductor.
4 IDENTIFY THE DISTRIBUTION SYSTEM
