My last 'non Amd 3' CU Install.

Dave OCD · Dec 21, 2015

Put this in today, I hope it doesn't burst into flames.:tongue3: Didn't have the time to faff about and get the cabling 'perfect' as I had so much to do today but I think it's ok. With the BG boards I generally 're number' the earth bar as to me it's illogical having the CPCs running in the opposite order of the neutrals,I'll miss the insulated CUs. Sorry about the
poor photo.

Simonslimline · Dec 26, 2015

hightower said:
Last paragraph is where I'd read it, doesn't mention s type until much later hence my confusion

Good that you showed us where you got the info from.

In reality though, it does not really work like that.

hightower · Dec 26, 2015

shanky887614 said:
what book is that hightower?

Electricians guide by John Whitfield

shanky887614 · Dec 26, 2015

hightower said:
Electricians guide by John Whitfield

p52 anyway that section is referring to mcb etc and that line is talking about discrimination between fuses/mcb

have a look at the table below (i thought i recognised the book ive got the 3rd edition)

hightower · Dec 26, 2015

Simonslimline said:
Good that you showed us where you got the info from.

In reality though, it does not really work like that.

Yeah it does later go on to say a 100ma rcd will likely go as well as a 30ma so type s is brought in to the equation, just about 120 pages on so I wasn't there yet haha

hightower · Dec 26, 2015

shanky887614 said:
p52 anyway that section is referring to mcb etc and that line is talking about discrimination between fuses/mcb

have a look at the table below (i thought i recognised the book ive got the 3rd edition)

Yep can see mcb, strange place to add an excerpt about rcd I think as all it did was throw me off

shanky887614 · Dec 26, 2015

hightower said:
Yep can see mcb, strange place to add an excerpt about rcd I think as all it did was throw me off

i havent read all of it but some bits might confuse people.

ive got the older version but its more or less the same word for word in that paragraph

Midwest · Dec 26, 2015

bigspark17 said:
as previously asked is this a tt system? Theres no dno earth and you havent got a rcd main switch at origin.?

Do ya think Dave OCD is visiting relatives today, or just board with the whole thing now?

bigspark17 · Dec 26, 2015

hightower said:
Why type s? I thought 100ma would offer enough discrimination from a 30ma? Read somewhere 3 times as much, so for discrimination 90ma or higher should act independently without the need for a time delay

Without knowing that this is not how you discriminate between rcd id like to know how you think youre in a position to offer advice on tt earthing systems?

davesparks · Dec 26, 2015

bigspark17 said:
Without knowing that this is not how you discriminate between rcd id like to know how you think youre in a position to offer advice on tt earthing systems?

Where has he offered advice on TT earthing?

hightower · Dec 26, 2015

bigspark17 said:
Without knowing that this is not how you discriminate between rcd id like to know how you think youre in a position to offer advice on tt earthing systems?

Mate, see that thing under my name that says trainee? Cut me some slack OK? I wasn't saying I was right - merely stating my understanding which other members have kindly corrected me on. Not everything has to turn in to an argument, but I'm not sure you grasp that after having a glance through your posting history. Nearly everyone on here is extremely helpful, especially for people like me. I wish the same could be said about everyone, but comments like yours do the square root of jack all to add to this awesome outlet.

Simonslimline · Dec 26, 2015

bigspark17 said:
Without knowing that this is not how you discriminate between rcd id like to know how you think youre in a position to offer advice on tt earthing systems?

Would still be great to admire a bit of your work as well, if posting a pic is not too much trouble.

GMES · Dec 26, 2015

bigspark17 said:
Without knowing that this is not how you discriminate between rcd id like to know how you think youre in a position to offer advice on tt earthing systems?

Hightower is a trainee which is clearly stated below his username and therefore is merely asking questions to better his learning.

**EDIT*** Hightower beat me to it but my point still stands!!

bigspark17 · Dec 26, 2015

shanky887614 said:
how? it is relatively easy in a lot of places to get a really low ra so why is an additional rcd needed in all cases

Well believe it or not its not there are people who out there who dont adhere to such high standards, theyll whack a 3/8 twig in on top of a mountain and leave with there big cheque, have seen in numerous occasions out in rural areas!