Breaking of the neutral conductor: Difference between revisions
From Electrical Installation Guide
(Created page with '{{Menu_Sizing_and_protection_of_conductors}} <br> <br>left<br><br>(see '''Fig. G64''')<br>The need to break or not the neutral conductor is related to …') |
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<br>[[Image:PictoChap7c.jpg|left]]<br><br>(see '''Fig. G64''')<br>The need to break or not the neutral conductor is related to the protection against indirect contact.<br>'''In TN-C scheme'''<br>The neutral conductor must not be open-circuited under any circumstances since it constitutes a PE as well as a neutral conductor.<br>'''In TT, TN-S and IT schemes'''<br>In the event of a fault, the circuit-breaker will open all poles, including the neutral pole, i.e. the circuit-breaker is omnipolar.<br>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. | <br>[[Image:PictoChap7c.jpg|left]]<br><br>(see '''Fig. G64''')<br>The need to break or not the neutral conductor is related to the protection against indirect contact.<br>'''In TN-C scheme'''<br>The neutral conductor must not be open-circuited under any circumstances since it constitutes a PE as well as a neutral conductor.<br>'''In TT, TN-S and IT schemes'''<br>In the event of a fault, the circuit-breaker will open all poles, including the neutral pole, i.e. the circuit-breaker is omnipolar.<br>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. | ||
[[ru:Отключение нейтрального провода]] | |||
Revision as of 14:38, 14 September 2012
(see Fig. G64)
The need to break or not the neutral conductor is related to the protection against indirect contact.
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
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.
