TNS DNO earth Braid

[Richard Burns]

The table in the top right shows that a 63 A will operate at 0.1 s at 820 A, so you can say at 900A it would be faster but if you take 0.1 s this will give a higher csa in the adiabatic if you then calculate for the earthing conductor and get a csa that is less than what you have at present then you are OK.
e.g. result is 2 mm² you have 6 mm² no problem.

 

[Leesparkykent]

Leesparkykent - that wouldn't be the relevant graph from the BRB by any chance LOL ?

Yeah it is

On a side note have I got a case for asking the DNO to upgrade the cut out ?
I been taught about asking for Ze by enquiry and stuff.
The reality with my DNO UKPN is they're not interested in anything that isn't an earner for them.

......

 

[newtothis]

Thanks for the image.
The coin has dropped - I'm feeling very happy !
Before this I couldn't even read the graphs :rolleyes4:
And I gave the adiabatic a major body swerve.
I fairly confident I can consolidate what I've learned from this post and take it further.