Sep 13, 2016
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If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
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Hi have wierd dilemma, looks to be 3 phase - 4 wire system so testing am getting this
L1-L2 Nothing
L2-L3 450v
L1-L3 450v
L1-N 230v
L2-N 230v
L3-N 230v
Why no L1-L2?
 
  • Funny
Reactions: Wilko
Your line to line voltage indicates you may have a split phase supply and the fact there is 0v between L1 and L2 points to them being on the same phase.
 
Yes got it guys thanks just realised haha
 
Yes got it guys thanks just realised
we have all been their Bradley scratching your head thinking now how do this three phase work ,lol.
back to school you need to go .:D
 
I was called out a few years ago to a faulty compressor..
Spoke to the sparky on site who confirmed all was ok, voltages checked, fuses ok, etc..
One of the fuses to the compressor had blown, L1 going through winding and back up onto L2 fuse..
said he had checked both sides of fuses and they were all live, he scratched his head for a while, drew him the circuit and the penny dropped...
I put it down to a faulty overload, saved him his blushes
 
Thanks guys so I have some outgoing circuits to connect up, so I just balance the load between L1 and L3 it’s only temporary till they get supply sorted sorry only apprentice
 
  • Disagree
Reactions: 1 person
Balance the load across all 3, the DNO have provided this set up for a reason.

Also, if you are an apprentice, who is supervising you?
 
  • Agree
Reactions: Pete999
Balance the load across all 3, the DNO have provided this set up for a reason.

Also, if you are an apprentice, who is supervising you?
But L1-L2 are on the same phase? And I’m with a couple of guys just thought I’d ask saves me looking stupid
 
At what position in the installation are you doing your tests?
It needs to be right at the incomer on the supply side with the load side isolated
 
At what position in the installation are you doing your tests?
It needs to be right at the incomer on the supply side with the load side isolated
Done at the very point the supply’s income is connected all fuses disconnect
 
Have you asked the experienced guys what they think, have they done or supervised any of this testing?

You should apply for the trainee part of the forum if you are an apprentice, that way answers are tailored better suited for someone who is learning. Will also get less grief for asking what would be a silly question for someone experienced.
 
So to confirm; with everything isolated you had two common phases?
Yes correct and where transformer is on top of the pole there 2 fuses not sure what there called and then one cable tapped into the other what looks like
 
You should apply for the trainee part of the forum if you are an apprentice, that way answers are tailored better suited for someone who is learning. Will also get less grief for asking what would be a silly question for someone experienced.[/QUOTE]
Well there on the same site but doing other bits so thought I’d ask so I kind of know what I’m talking about
 
Only 2nd year and I know just like to show I kind of know what I’m looking for and at
L1-L2 Nothing
L2-L3 450v
L1-L3 450v
L1-N 230v
L2-N 230v
L3-N 230v

So if I connect all sub circuits the same then there should be no issues?
 

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If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
United Kingdom
What type of forum member are you?
Practising Electrician (Qualified - Domestic or Commercial etc)

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3 phase test readings help
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Bradley6969,
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