Testing ring final circuits

[roukel01]

Morning All

When testing end to end resistance of r1, r2 and rn. Is there a number you can multiply the r1 reading to check that the r2 reading is ok? For some reason I seem to remember you can.

also, when tails enter a metal enclosure, they should enter through the same knockout/entry point. What code would you give a board where the live and neutral tails enter seperatley? or does it not matter when the enclosure is earthed?
Many Thanks.

 

[roukel01]

I've found the answer to my first question.... 1.67 (if 1.5mm) (page 36 Guidence note 3)
But what is the multiplyer if the CPC is 1.0mm?

 

[telectrix]

it's a ratio. 2.5/1.5 = 1.67, so 2.5/1= 2.5.