Connecting the neutral directly to the neutral bar | on ElectriciansForums

Connecting the neutral directly to the neutral bar

Discuss Connecting the neutral directly to the neutral bar in the Commercial Electrical Advice area at ElectriciansForums.net

L

Lintay

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Hi all, is it ok to connect the main incoming neutral to a 3 phase db directly to the neutral bar and avoiding the main isolator?
Thx
 
Lintay said:
The db came with a 4 pole isolator but I've been told it's ok to connect it straight to the neutral bar?
Surely this is bad practice?
Click to expand...
If you’ve got a 4 pole isolator then use it.
Generally tho in a TN system you can use a 3 pole isolator to isolate the phases only,as the neutral is considered to be around the same potential as earth as they are connected together at the transformer/supply end.
TT 3 phase supply then the neutral needs to be isolated also.
Generally there’s a neutral terminal on the main switch with 3 pole type on some manufacturers types were the neutral connects but isn’t switched.

Domestic single phase consumer units tho require double pole isolation as used by ordinary persons or unskilled electrically or whatever the hell it is nowadays.
 
Last edited:
Doesn't matter the means of supply for a TN system, submain or the origin. Neutral is deemed to be at earth potential on TN systems and there is no requirement to isolate it. This is not the case for TT and isolation is required.
 
why would you want to do this? surely it'd be easier to connect it to the isolator as the other 3 phases are going there too
 

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