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I want to create a new code for that:
PI : Potentially Interesting
Pretty certain I only ever see 3 pole main switches with removable neutral link. Maybe OP or @Risteard can confirm or make me look foolish
Discuss Low insulation resistance reading in the UK Electrical Forum area at ElectriciansForums.net
I want to create a new code for that:
PI : Potentially Interesting
You need a special switch if you want to switch 3 P and N - one where the neutral contact is set back so it closes early and breaks late, relative to the 3 phases.Pretty certain I only ever see 3 pole main switches with removable neutral link. Maybe OP or @Risteard can confirm or make me look foolish
You need a special switch if you want to switch 3 P and N - one where the neutral contact is set back so it closes early and breaks late, relative to the 3 phases.
What about if its TT earthing ?4 pole main switches are fairly common here, but the point was more about the fact we're free to use them, whereas I believe they can not be used in IE.
What about if its TT earthing ?
TT (Direct) Earthing is essentially non-existant within the State, bar perhaps a very few relics. TN-C-S (Neutralised) applies to very nearly 100% of electrical installations.What about if its TT earthing ?
should never break a neutral via a switch , if it hangs you can end up with 400 volts on a 230 volt circuit which will cause havoc.I could be wrong, but have a funny feeling that regulations in IE require that 3 pole isolation is used and neutral shouldn't be broken. Perhaps this only applies to the main isolator or perhaps it doesn't apply at all...
On a TT you need to isolate all conductors including the neutral, hence the switch where the neutral contact is set back so it closes early and breaks late, relative to the 3 phases.should never break a neutral via a switch , if it hangs you can end up with 400 volts on a 230 volt circuit which will cause havoc.
should never break a neutral via a switch , if it hangs you can end up with 400 volts on a 230 volt circuit which will cause havoc.
No caravan parks, swimming pools, stables etc ? That would use TT earthing ?.TT (Direct) Earthing is essentially non-existant within the State, bar perhaps a very few relics. TN-C-S (Neutralised) applies to very nearly 100% of electrical installations.
Reply to Low insulation resistance reading in the UK Electrical Forum area at ElectriciansForums.net
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