He wants to measure the actual length, not the resistance. The last time I looked lengths were measured in units such as mm, inches, yards etc, not ohms.As long as you know the where the very end of the circuit is, this can be done from the resistance as well, and also what size the conductors are you could equate the length from the resistance of the cables and comparing it with the OSG tables of resistance for cables.
Calculating the approximate length would be....Measuring length by measuring the resistance per metre seems like a possible idea,
No.but would it work it the ring main for instance has been previously extended so that it now looks like a figure of eight?
Well - that's progress...All I want to try an do if see if an existing ring main is within limits. I realise I cannot actually measure it
The usual tests for continuity will get you the figures you need.but a way to estimate is what I am looking for.
Indeed not...Pulling out the entire ring main is not really a viable option!!!
But that's not what he asked.
That's measuring another property, and using that to estimate the length.
He asked how to measure the length, not estimate or calculate it.
you can get a tester that`ll tell you ( to the nearest meter?) but I dont know what there called or where from LOL
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