size of main tails in flats

[wattsup]

How does consentric cable comply with the latest regs, assumming consumer side, how can an rcd opperate? I don't get it, sorry if I'm a bit slow with new stuff.

A truely consentric cable cannot comply on the consumer side, if it can please explain

They have no choice, you tell them where to install meters, so long as complying with regs, they cannot refuse. They supply the feed, thats all, you can put the meter in the cupboard under shed if you want...they are bull****ting you

 

[Spudnik]

There are 2 different types of concentric cable:

One is for DNO use which is central core and copper 'armour'.

Split concentric is the same, however, around half of the 'armour' is insulated blue with the rest bare for the cpc.

Split con: Split concentric cable to BS7870

Straight concentric is exactly the same with no neutral sheathing.

As for where the meter is put, the SSE will not install meters in bedrooms or kitchens etc, apparently due to access and fire risks etc. Their regs have nothing to do with 7671. They have their own rules.

Not sure what other DNO's do.

 

[wattsup]

That is a bit over the top, but I hope you get my drift, most times it is obvious where to install, sometimes it is not. When descrepincies arrise I always get my way, they put them where I/customer wants them...always, no argument, sometimes it costs more to put in position a) rather than position b) But they cannot dictate.

If they refused to install meters in communal area on one of my jobs I would simply take them to court, they would lose

I ain't going to read forum rules...there is concentric cable and none concentric cable, so you need to make your mind up which, there is no such thing as split concentric although I can appreciate that's what it is called generically.

How can you have a 'split concentric' that in it self is a contradiction

A meter can be fitted wherever you want, so long as it complies with the regs

Assuming the fixing point for meter complies and still they will not fix, sue them take em to court. It will not go that far, I can assure you they will fix

 

[coxy]

If running sub mains I would always use swa,maybe pvc t&e with separate cpc.There are loads of ways to terminate cables.Like I said before I think I would always use cables that I can see the ratings for in the regs.

 

[Spudnik]

That is a bit over the top, but I hope you get my drift, most times it is obvious where to install, sometimes it is not. When descrepincies arrise I always get my way, they put them where I/customer wants them...always, no argument, sometimes it costs more to put in position a) rather than position b) But they cannot dictate.

If they refused to install meters in communal area on one of my jobs I would simply take them to court, they would lose

I ain't going to read forum rules...there is concentric cable and none concentric cable, so you need to make your mind up which, there is no such thing as split concentric although I can appreciate that's what it is called generically.

How can you have a 'split concentric' that in it self is a contradiction

A meter can be fitted wherever you want, so long as it complies with the regs

Assuming the fixing point for meter complies and still they will not fix, sue them take em to court. It will not go that far, I can assure you they will fix

Im not entirely sure i understand what you are getting at.

There are 2 different types of concentric cable

One is a straight concentric which has a central core, wrapped in copper 'armour' that is only available for DNO use.

The other is a split concentric, ie the concentric part of the cable is split to form neutral conductors and cpc.

Split con is easier to install and complies fully with BS7671 and i have also confirmed this with tech support, but if you feel happier to run SWA then thats cool.

I know which id rather use.

The DNO have their own regs so they will do what they want and as i said, SSE will only install a meter in suitable locations. Nothing I/we can do about it down here.

As long as i know where its going, ill install accordingly. makes no difference to me.

 

[coxy]

Hi I think because of the termination of this type of cable in consumer units can be dangerous and with so many cowboys about would never reccommend this type of cable !

 

[Spudnik]

Hi I think because of the termination of this type of cable in consumer units can be dangerous and with so many cowboys about would never reccommend this type of cable !

Very true indeed, but 25mm SWA i think is just as bad as it is very difficult to work into a CU.

Still, each to his own i suppose.

 

[wattsup]

In 30 years I have never ever installed concentic cable, all I have ever done is take them out. That includes domestic, commercial and industrial. In all circumstances I would not use concentric cable. The definitation is blured somewhat, a concentric cable is by defination having a common centre. Which for intense and purpose is not allowed within usual scope of the regs. You cannot distinguish neutral earth within all given circuits, they are all as one.

From a supply it is allowed, but no sub circuits should be allowed, it is a very dangererous road to go down.

At all cost, no matter what bad information you get here should concentric wiring be used on the consumer side

lol, 25mm are shoe laces try terminating 350mm, into a poxy chinese isolator...half the price 10 times the trouble

Chinese say no splitter box needed, bull**** it is complete impossible without splitter, assuming 350mm

 

[Spudnik]

You cannot distinguish neutral earth within all given circuits, they are all as one.

I think the difference between neutral and cpc is fairly obvious:


Split concentric cable to BS7870


But hey, fair enough.

I have and am still using the above with all the right protection and havent had any problems at all.

As for the 350mm, we are talking about a domestic consumer unit, not an industrial or commercial installation.

 

[electro]

Hi


just read your reply, this would only work in a new build and only if the DNO would take reasonability for the riser which they no longer do. The guy said the meters are on the ground floor which the DNO rarely move, they limit there cable above ground to a minimum. You can not install a rising main and just tap off, as the whole block would be tapping off. You are talking about 6 flats to get consumer side power in domestic supply, concentric is fine, you could use double insulated if the containment is very good. Riser and twin earth not practical. Paul are the flats private or public sector?
Regards