TN-CS or TNS?

[wcampbell]

Hi all.

Can someone tell me what kind of E system this is?

I think its TNCS but the 6mm to E Sleeve is confusing me.

I think the MET is connected to the N - hence TNCS.

Should I upgrade 6mm E.

Thanks for your replies.

 

[SPARTYKUS]

That piece of cable as Telectrix points out, be it 4, 6 or 10mm, IS the fuse. Its protective device is the suppliers fuse which will only pop with a large current flowing, well after that piece of cable has melted/caught fire.

Hard to know what else to say really its been suggested already, maybe get someone in to do it and watch.

Saying that, it might be a 60A fuse but its still a demonic mess

 

[telectrix]

700a x 5s / 115 = 13.5mm = 16mm needed.


​if that's supposed to be an example of the adiabatic equation, then i suggest you do some reading.

 

[wcampbell]

Thanks for all the replies.

I let a Sparky with some forty years experience connect Sub Main Cable at the origin of the circuit ( although he did send someone else to do it ).

My experience may be low but I'm learning at a great rate of Knots.

On Friday I isolated Sub Main at origin with 63a Rcd. The RCBO in extension DB has 100a Isolator.

The Line Conductor cable has a CSA of 6mm so that's 12mmsq.

The time/current graphs in Regs say 100a RCBO = 500amps.

500x5/115 = 9.72.

Going to run 10mmsq from extension DB to MET at origin of the circuit.

I never gave a thought to the work done at origin, why would I - it's been done by a qualified Spark!

 

[Guest111]

as previous poster said, are you sure your ready to be assessed? not having a go like but anyone with any elec experience would see that the wiring on that meter is a lash up,do yourself a favour mate seriously get more experience,how are you gonna do the job if you don,t know when something isn,t done right?

 

[malcolmsanford]

Thanks for all the replies.

I let a Sparky with some forty years experience connect Sub Main Cable at the origin of the circuit ( although he did send someone else to do it ).

My experience may be low but I'm learning at a great rate of Knots.

On Friday I isolated Sub Main at origin with 63a Rcd. The RCBO in extension DB has 100a Isolator.

The Line Conductor cable has a CSA of 6mm so that's 12mmsq.

The time/current graphs in Regs say 100a RCBO = 500amps.

500x5/115 = 9.72.

Going to run 10mmsq from extension DB to MET at origin of the circuit.

I never gave a thought to the work done at origin, why would I - it's been done by a qualified Spark!

Son I do really try to help people on here, and I'm all for people learning .......but to be honest your clueless and you are a danger to yourself, and to anyone else you decide to do electrical work for.

Please do not take that assessment, I don't know what training you had or if your still in training or whatever, but please rethink you do not have the skills or training to be assessed and then take work on in peoples home.

Blunt, yes it can be, but I'm worried for your and others safety

 

[Hiddo]

Please don't take the assessment!!

 

[wams]

If I were in your shoes I would seriously consider following the advice of these respected members.

The appropiate action would be to contact the assessor as soon as or before he arrives, if not still meet him at the clients address or if its your address, better still!

Explain you cant go head with your assessment and admit you have bitten off more than you can chew and that the assessment is too complex based on your experience and knowledge, therefore you have identified your limitations and he may more than likely respect you as you have identified your limitations as a practicing electrician. He may want to look at the installation and agree with you that it is out of your scope. If he does agree then he will ask you to book the assessment another time using a lot less complex installation. The only thing he maybe annoyed about is travelling there, thats if he's travelled far.

What makes a godd electrician/competent electrician is someone who knows there limitations and is willing to seek help and guidance.

WAMS

 

[ABerry82]

i would say TNS

 

[ringer]

It's too late to cancel the assessment so you might as well go through with it. But do not be surprised if the assessor fails you. If you are really lucky he may ask you to put right certain things and provide proof it has been done. Either way you can expect a lot of questions from the assessor.

You seem to have a bit of electrical knowledge but judging from your comments and descriptions you are not yet competent. You need to either go (back?) to college or get an experienced electrician to let you work with them. We're not trying to put you down, we're just giving you a fair assessment of your current abilities. Do not be discouraged, but you need to learn some more.

Sent from my HTC Sensation using Tapatalk

 

[Silly Sausage]

Hi all.

Can someone tell me what kind of E system this is?

I think its TNCS but the 6mm to E Sleeve is confusing me.

I think the MET is connected to the N - hence TNCS.

The values of your Prospective Fault Currents should give you a good indication of which earthing system it is.

Hope your assessment isn't too much of a nightmare!

 

[telectrix]

it wiil be if he leaves that 6mm in there.

 

[D80]

If you go ahead with the assessment let us know how it goes

 

[telectrix]

computer says nooooo. cough

 

[Knobhead]

wcampbell, just let you know I’ve added the picture you posted to my gallery of horrors.

 

[kenny james]

if you are going to take an nic assessment make sure you book it for 1st april.and maybe then the nic inspector may laugh with you.