Expected r1 r2 value when circuit 16.5m long

[smthdeedog48]

Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long

 

[Plonker 3]

We dont do other peoples homework for them. Now if you show your working out and answers we will gladly help you

 

[davesparks]

This sounds suspiciously like a homework question, which is something we don't just answer for you.

If you tell us what you think the answer is and how you worked it out, or just what you think you should do to work it out then we can help you with advice.

 

[GMES]

Is this a college question, if so let us know and try and have a go yourself then all the guys will happily jump in to help you out.

 

[trev]

You have all the info you need to do this mate but like everyone else has said, you have to have a go yourself first

 

[Pete999]

Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long

Do the math

 

[smthdeedog48]

A bit harsh hey! Not asking for you to do my home work! Just a push in the right Direction

 

[Silly Sausage]

One hint ...

R1+R2 = (r1+r2)/4

 

[telectrix]

OK. multiply the resistance/m for r1 x the length. then do the same for r2. then add them together. you might need an abacus or a smoke packet and pen if you can't do it in your head

edit: just re-read OP/. if you want R1+R2 (allowing for a typo), then do as archie said just. mancs are not just for football.

 

[smthdeedog48]

well can some tell me where in my regs or guidance note I may find how to do the Maths my self? See I have a exam on Tuesday and just trying to get my head around the formulas working out a question like this one cheers thanks for the push to do it myself.

 

[Silly Sausage]

well can some tell me where in my regs or guidance note I may find how to do the Maths my self? See I have a exam on Tuesday and just trying to get my head around the formulas working out a question like this one cheers thanks for the push to do it myself.

It's in GN3 somewhere I think.

 

[smthdeedog48]

Ha ha is this how you guys break in the newbies lol

 

[telectrix]

well can some tell me where in my regs or guidance note I may find how to do the Maths my self? See I have a exam on Tuesday and just trying to get my head around the formulas working out a question like this one cheers thanks for the push to do it myself.

in that case, make sure you differentiate between r1 and R1 etc. in an exam correct terminology is crucial. r1 is the end to end resistance of a ring final. R1 denotes resistance to mid point. ( this relating to the L conductor. rN, Rn... r2,R2 respectively for N and E conductors.)

 

[smthdeedog48]

I thought this a fello website for electricians who might need a hand from the more experienced I have loads to review until Tuesday I have must of down pack, just got stuck on this one lol thank for your encouragement and help lol

 

[GMES]

I thought this a fello website for electricians who might need a hand from the more experienced I have loads to review until Tuesday I have must of down pack, just got stuck on this one lol thank for your encouragement and help lol

If you are in college why not apply for access to our trainee section where there are guys studying the same courses and can be a huge help with questions, also a few of the guys who are advising you in this thread are also mentors in their and will give you heaps of assistance.

 

[Silly Sausage]

Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long

AH, you're a fellow Manc!
Here you go...

r1 = 0.00741 * 16.5 Ohms
r2 = 0.0121 * 16.5 Ohms

R1+R2 = the sum of the above divided by 4 (see previous equation up thread)

 

[smthdeedog48]

The answer is 0.08

 

[smthdeedog48]

Thanks everyone ! One more advice tip I'm chasing to do test and inspections 56 next month and fit through the loft space lol just want to do the testing side of things and some remedial work when I give a c1 /c2/ or c3 and save all the claiming for young guys lol. Cheers again for everyone help my name is Darrel

 

[NDG Elecs]

Twelvty milli megas according to my trusty Texas Instruments.

 

[Silly Sausage]

Twelvty milli megas according to my trusty Texas Instruments.

Have you been on the local special stuff for local people?

 

[telectrix]

think his trusty texas instruments came from the alamo. or else he's been on the texas corn moonshine.

 

[frontier219]

Thanks everyone ! One more advice tip I'm chasing to do test and inspections 56 next month and fit through the loft space lol just want to do the testing side of things and some remedial work when I give a c1 /c2/ or c3 and save all the claiming for young guys lol. Cheers again for everyone help my name is Darrel

Genuine enquiry, no offence meant, but can anyone translate this?

 

[Silly Sausage]

Genuine enquiry, no offence meant, but can anyone translate this?

It's Northern speak, you stand no chance!

 

[frontier219]

It's Northern speak, you stand no chance!

Ahh apologies, I didn't check that. Must've put a bit too much raspberry in my shandy!

 

[Leesparkykent]

Genuine enquiry, no offence meant, but can anyone translate this?

From what I gather and can decipher lol, I think he means he only wants to do EICR's and then pick the remedial work after and doesn't really want to be grafting and climbing in to lofts etc lol

 

[frontier219]

From what I gather and can decipher lol, I think he means he only wants to do EICR's and then pick the remedial work after and doesn't really want to be grafting and climbing in to lofts etc lol

Have you been trained in Northern then, Lee?

 

[Leesparkykent]

Have you been trained in Northern then, Lee?

A little from being on here and I'm original from the west mids lol

 

[smthdeedog48]

Cheers guys

 

[smthdeedog48]

Hi buddy did your math didn't get the answer I know the answer got off the answer sheet 0.08 so how did they get 0.08?

 

[Pete999]

A bit harsh hey! Not asking for you to do my home work! Just a push in the right Direction

Sorry mate, you got your terminology wrong, and that messed up my train of thought, hope the rest of the replies have put you right

 

[Andy78]

Hi buddy did your math didn't get the answer I know the answer got off the answer sheet 0.08 so how did they get 0.08?

All the answers and formulas are in this thread and your college notes and GN3 and the OSG.

 

[smthdeedog48]

Well guys thanks for the help ! Exam on Tuesday certificate of competence by Napit open book guidance note 3, Onsite Guide , BS7671 regs. Anyone took this test if so any tips or reviews of those 3 books I should be focussing on? Cheers equilent to the 2391

 

[Simonslimline]

Well guys thanks for the help ! Exam on Tuesday certificate of competence by Napit open book guidance note 3, Onsite Guide , BS7671 regs. Anyone took this test if so any tips or reviews of those 3 books I should be focussing on? Cheers equivalent to the 2391

The 2391 is no longer. It's now the 2394/2395.

I very much doubt that the Napit version of this is anywhere near the equivalent to be honest.

 

[trev]

Cheers equilent to the 2391

Sorry mate but it isn't.

 

[smthdeedog48]

So you saying Napit is ripping off they are letting join the scheme if I past this exam!

 

[trev]

Mate, the scams just want your cash and the more of it they can get the happier they are.
Why do you think they're called scams?

 

[smthdeedog48]

I've past my 2392 does that count for anything

 

[spark 68]

I thought the 2392 was just single phase ? besides it is only level 2 anyway.

 

[martinxxxxxx]

Not a lot compared with the 2391, put it this way I past the 2392 in an afternoon. It took 3 months of hard study and application to pass the 2391. I literally slept with GN3 for 90 nights and read it for 90 days. I didn't need to come on a forum to ask what was on page 36, it was faded from the book to my chest where I fell asleep with the page open. Can you really say that the napit test will be the equivalent of this?

 

[martinxxxxxx]

I wrote all the questions down from my 2391, do you want to try one?

 

[123]

TBF 2391 isn't/wasn't that hard either

 

[Leesparkykent]

TBF 2391 isn't/wasn't that hard either

That must be why it had an average of about a 60% failure rate.

 

[123]

That must be why it had an average of about a 60% failure rate.

Doesn't mean a lot, that was down to the entrants not being ready for the exam. Forget the non electricians taking part, but many sat the 2391 to get JIB Appproved status and a pay rise, despite day in day out only doing the likes of containment etc, never coming near to a piece of test equipment

 

[Simonslimline]

I wrote all the questions down from my 2391, do you want to try one?

Fire away...

 

[Silly Sausage]

Fire away...

I've got loads of them scanned somewhere on my computer.
I'll try and find them if you really want.

 

[Simonslimline]

I've got loads of them scanned somewhere on my computer.
I'll try and find them if you really want.

Don't go to any trouble on my behalf. I have some past papers in my Dropbox.

I am just interested to see what he may post up.

 

[martinxxxxxx]

It would be a real one from my actual exam, it was a contrevesual year as there more than ave failures. But if you have some past ones anyway, I am sure I don't need to go to the attic and dig mine out

 

[smthdeedog48]

Yeah Guys Passed practical Tomoz thanks for the push in the right direction guys

 

[Pete999]

Yeah Guys Passed practical Tomoz thanks for the push in the right direction guys

You got a time machine then lol