how to measure existing shower cable?

[SUNRAY]

That - 1.04 - is the same as in the wiki link I posted, although both should actually be 1.09mm.

Ah ok, it is somethig I've had saved on my laptop for a while, I've not tried verifying the values. In fact there are CPC columns too but I'm sure it needs updating.

 

[EFLImpudence]

so 8.5kw could be fine. but just to be safe i gonna find another 7.5kw shower to replace with as i dont want electrician to replace the cable to higher rating as it will cost a lot of money..

There is no difference in the cable which would correctly be chosen and fitted for a 7.5 or 8.5kW shower.

 

[SUNRAY]

That - 1.04 - is the same as in the wiki link I posted, although both should actually be 1.09mm.

Ah ok, it is somethig I've had saved on my laptop for a while, I've not tried verifying the values. In fact there are CPC columns too but I'm sure it needs updating.

View attachment 236923

 

[BS3036]

Measure the copper core diameter with a micrometer and calculate the cross sectional area using pi times dia divided by 4. Multiply by the number of strands.

I'm surprised no-one has notice the rather obvious error in this. I thought if it came from Winston you'd be on it like a ton of bricks!

 

[EFLImpudence]

It seems I was wrong and the figures are correct; not sure what I did wrong.

 

[bernardgreen]

obvious error in this. I thought if it came from Winston

Winston doesn't make errors. something he is always telling us.

 

[winston1]

I'm surprised no-one has notice the rather obvious error in this. I thought if it came from Winston you'd be on it like a ton of bricks!

It is corrected.

 

[winston1]

damn, i dumb at math.

each core has 7 copper strands and each copper strand is 1mm
no idea how to calculate the cross sectional area. i think i'll leave it and get an electrician to find out for me.

damn, i dumb at math.

Use a calculator then.

each core has 7 copper strands and each copper strand is 1mm
no idea how to calculate the cross sectional area.

I told you in post 3.

But pi x1 x1 divided by 4 x7= 5.5 mm2. I guess it is 6mm2 and you didn’t measure the dia accurately.

 

[winston1]

You wrote " diameter" and also "dia" are these different things or just another bit of lazy writing by you when imparting low value advice.,

Suppose the OP does not have a micrometer, would you advise him to buy or hire one

I’m not the first one to use abbreviations on forums. Why don‘t you hassle anyone else?

What is low value advice about basic schooldays maths?

Did you not see his digital callipers in post 5?

 

[SUNRAY]

There is no difference in the cable which would correctly be chosen and fitted for a 7.5 or 8.5kW shower.

4mm² + 32A OCD will generally just be acceptable for 7.5KW but not 8 KW although there are many 8.5KW showers running on such an arrangement.

 

[bernardgreen]

Did you not see his digital callipers in post 5?

I admit that I was not paying full attention and as a result did not look at post number 5

 

[SUNRAY]

Winston doesn't make errors. something he is always telling us.

I simply reported it as posting incorrect advice. AGAIN

 

[333rocky333]

I admit that I was not paying full attention and as a result did not look at post number 5

Though Winston said what he said in post 3

 

[bernardgreen]

I simply reported it as posting incorrect advice. AGAIN

I might have been as kind but after a day of hunting the errors in a large assembler language programme my tolerance of errors was ( is ) close to zero.

 

[JohnW2]

I don't know where this table originated but generally it seems to work

As for 'where it originated', it looks very much as if it is a copy of what I uploaded to the DIYnot wiki years ago (that is, when I could actually access {to edit} the wiki - I thought that was the idea of 'a wiki'?!).

Kind Regards, John