Breaking of the neutral conductor: Difference between revisions
From Electrical Installation Guide
m (1 revision) |
(Text modified (guide 2015)) |
||
| Line 3: | Line 3: | ||
[[File:PictoChap7c.jpg|none]] | [[File:PictoChap7c.jpg|none]] | ||
(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. | (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<sup>(1)</sup>'''<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]] | [[ru:Отключение нейтрального провода]] | ||
[[zh:中性线的分断]] | [[zh:中性线的分断]] | ||
Revision as of 06:22, 3 December 2014
(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(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.
