Why do people twist CPC's?

I Around twenty years ago I was sat in a classroom at Kidderminster College on  Thursday evening after work attending an electrical training course.

The lecturer was running through ring final circuit testing in particular the continuity testing. On the rolling blackboard he chalked up a table of test results.

Having taken end to end continuity readings the ends of the circuit had been interconnected to create the big ring for testing and sockets tested, so at some sockets the reading was higher than others, but at one of them instead of a numerical test result it said “TPFO”.

I had to stop him and get him to explain it as I didn’t get it straight off after a long day at work, driving and sitting through half a lecture.

So we had a discussion about the cause and effect of “TPFO” , also how and why it’s best avoided.

Over to you ?‍?

I Around twenty years ago I was sat in a classroom at Kidderminster College on  Thursday evening after work attending an electrical training course.

The lecturer was running through ring final circuit testing in particular the continuity testing. On the rolling blackboard he chalked up a table of test results.

Having taken end to end continuity readings the ends of the circuit had been interconnected to create the big ring for testing and sockets tested, so at some sockets the reading was higher than others, but at one of them instead of a numerical test result it said “TPFO”.

I had to stop him and get him to explain it as I didn’t get it straight off after a long day at work, driving and sitting through half a lecture.

So we had a discussion about the cause and effect of “TPFO” , also how and why it’s best avoided.

Over to you ?‍?