Electrician Jobs The old one still learning

[Gary latto]

Hi telectrix I understand the cpc would be 1.67x greater due to only 1.5 , so yes like you say 0.5 x1.67 =0.83 .
But totally confused with regards the 1.66 calculation
So like you say the phase and cpc seem fine so neutral problem am I still looking at a bad connection do you think ?

 

[mjroe]

Ignore me, listen to Tel, I mis read your line and neutral end to end readings. The r1 seems to be right, as Tel said it's the rN that needs investigating, again a loose connection could quite easily be the cause.

The 1.66 (or 1.67 if you want to round up the recurring figure) comes from the difference in the cross sectional area of the live conductors and cpc. 2.5 (mm2) / 1.5 (mm2) = 1.666666666 (recurring).

So r2 should be 1.66 x greater than r1 (and rN).

Hope that makes sense.

 

[telectrix]

yep.might just be a terminal screw a bit loose in a socket. any why the confusion with 1.66? it's the ratio of 1.5/2.5.

 

[telectrix]

Ignore me, listen to Tel, I mis read your line and neutral end to end readings. The r1 seems to be right, as Tel said it's the rN that needs investigating, again a loose connection could quite easily be the cause.

The 1.66 (or 1.67 if you want to round up the recurring figure) comes from the difference in the cross sectional area of the live conductors and cpc. 2.5 (mm2) / 1.5 (mm2) = 1.666666666 (recurring).

So r2 should be 1.66 x greater than r1 (and rN).

Hope that makes sense.

you are excused due to the fact that you are in Devon. too much time smuggling booze and hanging pirates.

 

[mjroe]

smuggling booze

As I was born in Somerset it really aught to be scrumpy...

 

[telectrix]

my favorite tipple at my old local was Addlestones cloudy cider on draft. 7%. only 2 of us drank it, but we got through 2 x 10 gallons a week between us. sadly my mate has moved to a better world, having been crushed between a 50ft. canal barge and a lock when pi$$ed.

 

[Gary latto]

Confused with the 1.66 cause I learnt the 1.67 factor
Guys many thanks for your replies/answers all makes sense now thanks yet again much appreciated to all

 

[telectrix]

yeah, it's that tricky maths again. 1.6666666666 rounded up to 1 67. was much easier when we had roman numerals. XVIIIIIIIIIIIIIVIII.

 

[static zap]

yeah, it's that tricky maths again. 1.6666666666 rounded up to 1 67. was much easier when we had roman numerals. XVIIIIIIIIIIIIIVIII.

I always preferred vulgar fractions 2.5/1.5===5/3

(then reminding your common sense 0.99999999 .. =1)
so a third is 0.333333333 ..

 

[Pete999]

I always preferred vulgar fractions 2.5/1.5===5/3

(then reminding your common sense 0.99999999 .. =1)
so a third is 0.333333333 ..

Wonderful

 

[telectrix]

I always preferred vulgar fractions 2.5/1.5===5/3

(then reminding your common sense 0.99999999 .. =1)
so a third is 0.333333333 ..

Spock strikes with logic yet again. but McCoy would argue that 0.3333333 is not a turd. it's life Jim, but not as we know it. (enter the Borg).

 

[Zerax]

I'm old school... I prefer 1⅔

 

[telectrix]

and pi is 22/7.

 

[telectrix]

think this thread has fractionally run it's course.

 

[Zerax]

I'm old school... I prefer 1⅔

 

[Zerax]

And the VAT fraction is 1/6 but used to be 7/47... life is far easier in fractions !

 

[telectrix]

how is 1/6 related to 20%?

 

[Zerax]

how is 1/6 related to 20%?

If you know the gross figure (net+vat) divide it by 6 and times 1 to give you the VAT... Not so relevant now as 20% is easy to work with, but when it was 17.5%, you'd divide by 47 and times by 7 for the VAT element. Or times by 40 instead to give you the Net element.

Far easier than multiplying the gross by 0.148936 to give you the VAT.

Fractions are very useful things... as are feet and inches but that's a different topic...

 

[Pete999]

make sure your leads are making a good solid connection before you go taking sockets off the walls