My ze high
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Typical maximum values are 0.8 ohms for TN-S, 0.35 ohms for TN-C-S.
0.12 is entirely normal and expected.
0.12 is entirely normal and expected.
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Well, it is not. You wrote 0.08 first.
Sorry I meant 0.8 ohm for TN S
This is where it is much easier to work in milli-ohms! His Value 120 mΩ, limit (TN-S) 800 mΩ and TN-C-S 350mΩ. 
Indeed it is - and you hopefully understand that 0.12 is considerably less than (the 'maximum' of) 0.8 ?
Kind Regards, John
0.8 is 80% of 1
0.12 is 12% of 1
The first number after the decimal point, is what counts.
0.199999999999999 would almost be 0.2
I can't believe Im responding to a maths question though, as I'll probably get it wrong
0.12 is 12% of 1
The first number after the decimal point, is what counts.
0.199999999999999 would almost be 0.2
I can't believe Im responding to a maths question though, as I'll probably get it wrong
Don't panic - you didn't (get it wrong)I can't believe Im responding to a maths question though, as I'll probably get it wrong
Maths is a strange subject, in that a good few people seem to have problems in understanding concepts which others regard as "simple, basic and 'obvious' ". If I understand the OP's problem correctly, it's not all that uncommon, and tends to arise in those who would read/pronounce 0.12 and 0.8 as "nought point twelve" and "nought point 8" respectively.
As someone said early on, things usually become clearer to some people if one describes both numbers in terms of the same number of decimal places - they would then become 0.12 and 0.80, which might be verbalised as "nought point twelve" and "nought point eighty" - which would make the relative sizes more obvious.
Kind Regards, John
E
EddieM
Yes I've heard of storey of an "electrician" fixing a problem with an electric garage opener. His diagnosis was the motor wasn't powerful enough to lift the door, it being a 1/2 HP motor, so he changed it for a 1/4 HP motor as 4 is bigger than 2. Probably an urban myth, but one you'd like to believe is true.
Speaking of how people struggle with decimal points, I have the following to offer. In an underground tram station in Portland OR, I came across a celebration of science that Portland had paid millions to have carved into marble. This particular carving is to demonstrate mathematics...
It hit me within a few seconds. I'll leave it to the reader to deduce how the mistake arose.
It hit me within a few seconds. I'll leave it to the reader to deduce how the mistake arose.
The solution is therefore, as with many things, to do it properly.
It is "nought point one, two".
Quite probably not a myth.
Over the years/decades, I have often been involved in trying to communicate mathematical information to 'non-mathematical' audiences - and I've found that things such as you mention, which is similar to believing that "nought point twelve" is greater than "nought point eight", seem to be a fair bit more common than I would have expected.
'People who should know better' can be instrumental in setting the scene for such misunderstandings, since it's far from unknown for people such as newsreaders and TV presenters to use the "nought point twelve" form of terminology!
Kind Regards, John
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