Meter tail - CU >25m

B

Balarizaaf

Hi Guys!

I have a big job incomming and I am a bit confused how to do one thing. I am supposed to do full rewiring of an apartment house. First, I need to place a tails from meter to CU. Length of the tail will be up to 25 meters. How am i supposed to ensure protection of this tail and what size of it should I use?
 
Balarizaaf said:
Hi Guys!

I have a big job incomming and I am a bit confused how to do one thing. I am supposed to do full rewiring of an apartment house. First, I need to place a tails from meter to CU. Length of the tail will be up to 25 meters. How am i supposed to ensure protection of this tail and what size of it should I use?
Click to expand...

Why did you accept the job if you don't know how to do this?
 
You are not permitted to have tails this length ... you will have to have a fused isolator and the CU supply will then be a submains ... then use your cable calcs to assess what size cable you require.
 
Re: Meter tail - CU >25m

darkwood said:
You are not permitted to have tails this length ... you will have to have a fused isolator and the CU supply will then be a submains ... then use your cable calcs to assess what size cable you require.
Click to expand...
I know i can , but i need to protect that cable with fuse or rcd

- - - Updated - - -

Goshhh... Why do yu hate me so much:/
 
Balarizaaf said:
i know and i am checking if yu know.
Click to expand...

Be careful how you phrase responses this can be taken a few ways .....

You could be trolling here if you read this one way or actually saying are unsure how to do it and your asking for advice... this info is in the OSG regarding tail length lets hope you are just asking for a refresher as you haven't needed to implement these regs before and its slipped your mind but honestly its easy to look this one up in the BS7671
 
Re: Meter tail - CU >25m

Writing with yu guys is like walking on a broken glAss:/
i know i can chck this and drfinietly i am gonna do it... I just thought we can make perfectly nice conversation here...
 
Re: Meter tail - CU >25m

Balarizaaf said:
I know i can , but i need to protect that cable with fuse or rcd

- - - Updated - - -

Goshhh... Why do yu hate me so much:/
Click to expand...

We are not against you .. when you ask a question we have to assume you competence and as your profile says you are an electrician this is one of those questions that really is expected of an apprentice at most ... that aside we all have our blonde days so if your going to ask a question try changing your approach.. you'll see a totally different response well except some who find it easy to slate but don't often offer good advice...

E.G.

Hey guys ... im having one of them brain freezes - y consumer unit is 25m away from the cutout so i propose having a 63amp fused isolator next to the cutout and running Xmm cable to CU - does this sound ok ..please advice ;)

.....
Your responses to the same question will be more then helpful if you think on how to word it better.
 
there is a new diy forum maybe this should be sent there, nobody is trying to be offensive but this is basic stuff as darkwood said get your books out and study them.
 
OK guys, sorry for disrespect and choosing an easy path. I was writing from my phone and I was busy going out home, so I left yu just a short note.

What I want to do, is to place 16tail through the wall and under floors by drilling holes in the joints, and then to CU. I am going to use double insulated cable (standard meter tail) and secure it with 63amp fuse.

Is this ok for this kind of installation or should I use 25mm cable or sheathed cable?
 
Last edited by a moderator:
Re: Meter tail - CU >25m

7029 dave said:
3 meters max for double insulated tails, otherwise you r into subs.
Click to expand...
No such thing as double insulated tails if you are talking about the brown/blue with grey outers.
They are insulated & sheathed.

- - - Updated - - -

Balarizaaf said:
OK guys, sorry for disrespect and choosing an easy path. I was writing from my phone and I was busy going out home, so I left yu just a short note.

What I want to do, is to place 60mm tail through the wall and under floors by drilling holes in the joints, and then to CU. I am going to use double insulated cable (standard meter tail) and secure it with 63amp fuse.

Is this ok for this kind of installation or should I use 25mm cable or sheathed cable?
Click to expand...
60mm tail?...
Double insulated?...
 
Meter tail - CU >25m

The above post is making my brain hurt!! It makes no sense!! 60mm tail, 63a, 25mm cable?? Sounds like this one might need notifying to the fire service let alone a scam provider! :-)
 
Meter tail - CU >25m

Going back to the tail length issue though, i was doing a bit in my parents house ( a nearly 2 year old new build) to my surprise (never noticed or paid much attention to it) the meter box was opposite side of the house to the CU, 25mm tails running through stud work, joists etc all backed up by the 100a fuse!! Length of run approx 10meters! Barratt House btw :-)
 
Ideally you want to be using a SWA as your sub suitably fused at origin. This will negate the need for additional protection on your sub and also leaves you without the problem of having RCD's in series.
 
Re: Meter tail - CU >25m

Balarizaaf said:
OK guys, sorry for disrespect and choosing an easy path. I was writing from my phone and I was busy going out home, so I left yu just a short note.

What I want to do, is to place 16tail through the wall and under floors by drilling holes in the joints, and then to CU. I am going to use double insulated cable (standard meter tail) and secure it with 63amp fuse.

Is this ok for this kind of installation or should I use 25mm cable or sheathed cable?
Click to expand...

Where to start.....

Firstly, there is no way that I'd run standard meter tails through the house unprotected. Secondly, do you mean "armoured" cable, when you say "sheathed"?
Are you really a qualified electrician?
 
Double insulated tails, 6181y. That's double insulation as was stated inc 3m rule for meter tails not t&e. Swa submain through a house can be hard especially if its for the whole house load. Also you need to put a sw/fuse in adjacent meter box to cut out box or in the house the opposite side of it.
The op talks and posts like someone else on here.
 
Re: Meter tail - CU >25m

Standard cable would be protected by RCD, and when I said shethead I meant armoured cable.
 
sledgehammer said:
Double insulated tails, 6181y. That's double insulation as was stated inc 3m rule for meter tails not t&e. Swa submain through a house can be hard especially if its for the whole house load. Also you need to put a sw/fuse in adjacent meter box to cut out box or in the house the opposite side of it.
The op talks and posts like someone else on here.
Click to expand...

You're right, he does sound like you :)
 
It would be nice to nice to know maximum load of house then apply diversity to calculate max load and actual load. Then you can decide 16mm or 25mm with a fused isolator on both sides would be preferred solution. Otherwise distribution board will need sticker isolate elsewhere. You can calculate load by wattage of appliance divide by 230v to get amps.
Ignore some people on here like to slate more than helping it helps their brain disorder ;-)
 
sajeel said:
It would be nice to nice to know maximum load of house then apply diversity to calculate max load and actual load. Then you can decide 16mm or 25mm with a fused isolator on both sides would be preferred solution. Otherwise distribution board will need sticker isolate elsewhere. You can calculate load by wattage of appliance divide by 230v to get amps.
Ignore some people on here like to slate more than helping it helps their brain disorder ;-)
Click to expand...

So, if you were to supply the property with a 63A Switchfuse, are you saying that you would you decide the cable size based on diversity? Also, how would you apply discrimination with your "preferred solution" of a fused isolator on both sides of the cable, in addition to the DNO fuse?
Still, as you say, better to ignore some of us with thousands of posts, as our "brain disorder" stops us from talking sense. ;)
 
Re: Meter tail - CU >25m

Wiresandthings said:
Going back to the tail length issue though, i was doing a bit in my parents house ( a nearly 2 year old new build) to my surprise (never noticed or paid much attention to it) the meter box was opposite side of the house to the CU, 25mm tails running through stud work, joists etc all backed up by the 100a fuse!! Length of run approx 10meters! Barratt House btw :-)
Click to expand...

Why not contact Barratt's and ask them what they are going to do about this non compliance tail installation in your parents house!!
Should be interesting to see what they have to say, as the situation will probably apply to every other house of this type on the development!! lol!!
 
Yep chaps I googled 6181y and even the manufacturers like Batt cable call it double insulated. They then say insulated and sheathed cable! So I stand corrected. Is that pandering to on site terminology??
Guitarist, my point was, has someone who's had a hard time on here posting using a 2nd name because of abuse?
 
sledgehammer said:
Is that pandering to on site terminology??
Click to expand...

Precisely, as reference to insulated and sheathed cables as "double insulated" is a nonsense. The sheath is merely to provide mechanical protection, and although it may be made of an insulating material it certainly isn't tested to any standard for that.
 
sledgehammer said:
Yep chaps I googled 6181y and even the manufacturers like Batt cable call it double insulated. They then say insulated and sheathed cable! So I stand corrected. Is that pandering to on site terminology??
Guitarist, my point was, has someone who's had a hard time on here posting using a 2nd name because of abuse?
Click to expand...

I don't consider trade banter "abuse" to be honest. Trouble nowadays is that so few go through an apprenticeship, that when anyone says the slightest thing which isn't complimentary, we get told that we're being "harsh" or "abusive". That's the legacy of the modern age.
 
Meter tail - CU >25m

Is this post serious, sounds you don't have a clue how to do it and waiting for someone on here to tell you, r u qualified
 

Similar threads

J
Removing redundant meter tails yes or no
Replies
2
Views
481
Jamie89
J
A
EV consumer unit tails
Replies
8
Views
1K
DefyG
D

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Green 2 Go Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses Heating 2 Go
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Daily, weekly or monthly email

Receive a daily, weekly, or monthly email containing a digest of new and recently updated threads.

Thread Information

Title
Meter tail - CU >25m
Prefix
N/A
Forum
Electrical Wiring, Theories and Regulations
Start date
Last reply date
Replies
38

Thread Tags

Tags Tags
meter meter tail

Advert

Thread statistics

Created
Balarizaaf,
Last reply from
tannerselectric,
Replies
38
Views
5,372

Advert

TrueNAS JBOD Storage Server

Tilers | UK Tiling Forum | Tilers Forums | Find a Tiler
Plumbers Forums | Plumbing Advice | Gas Forum
Back
Top