Breaking of the neutral conductor: Difference between revisions
From Electrical Installation Guide
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{{fn-detail|1|In some coutries the rules applied for TN-S are the same | {{fn-detail|1|In some coutries the rules applied for TN-S are the same as the rules for TN-C}} | ||
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[[ru:Отключение нейтрального провода]] | [[ru:Отключение нейтрального провода]] | ||
[[zh:中性线的分断]] | [[zh:中性线的分断]] | ||
Revision as of 10:47, 15 May 2018
(see Fig. G68)
The need to break or not the neutral conductor is related to the protection against indirect contact (fault protection).
In TN-C scheme
The neutral conductor must not be open-circuited under any circumstances since it constitutes a PE as well as a neutral conductor.
In TT, TN-S and IT schemes[1]
In the event of a fault, the circuit-breaker will open all poles, including the neutral pole, i.e. the circuit-breaker is omnipolar.
The action can only be achieved with fuses in an indirect way, in which the operation of one or more fuses triggers a mechanical trip-out of all poles of an associated series-connected load-break switch.
Notes
- ^ In some coutries the rules applied for TN-S are the same as the rules for TN-C
