Insulation resistance help

[Pauldicker]

I'm still a newbie but here goes.
as part of my Elecsa assessment I have changed the outlaws 1970's Fuse board to a new 17th edition cu.
the wiring is still original as well. Due to equipment that I cannot get to or remove I bridged the line to cpc and tested between that and neutral. On all the circuits results were between 230 to 1200 M ohms.
is this still a pass and what would be expected of 40yr old cable or am I doing something wrong.

 

[Plonker 3]

Is that 230 ohms or 230 M ohms for the lowest value?

 

[Pete999]

Why not link L and N and carry out an IR test @240v between LN to E.

 

[telectrix]

I'm still a newbie but here goes.
as part of my Elecsa assessment I have changed the outlaws 1970's Fuse board to a new 17th edition cu.
the wiring is still original as well. Due to equipment that I cannot get to or remove I bridged the line to cpc and tested between that and neutral. On all the circuits results were between 230 to 1200 M ohms.
is this still a pass and what would be expected of 40yr old cable or am I doing something wrong.

so you still managed to bang 500V d.c. across L and N.

 

[Pauldicker]

Why not link L and N and carry out an IR test @240v between LN to E.

Yes sorry typo, I bridged line and neutral and tested between line/neutral and cpc.

 

[Silly Sausage]

Yes sorry typo, I bridged line and neutral and tested between line/neutral and cpc.

I was hoping that was the case!

 

[telectrix]

i retract my post then.

 

[Pauldicker]

Sorry for the typo. I joined the line to neutral bar and tested between line/ neutral and cpc.

My kt65 measures I'm M ohms so 230 was in M ohms

 

[Sintra]

If the results are in M ohms then there's not an issue.

 

[Plonker 3]

You should buy, read and understand GN3 for guidance on what readings you should expect when testing.