new "earthsure" cable

[Sureitsoff?]

as title, doncaster cables are to launch a new range of twin and earth cables with preinsulated cpc. 1.0/1.5 and 2.5 initially but they hope to sell all sizes soon

"about bl++dy time"

 

[JohnW2]

as title, doncaster cables are to launch a new range of twin and earth cables with preinsulated cpc. 1.0/1.5 and 2.5 initially but they hope to sell all sizes soon

Interesting, if it's true. Such cables are, of course, already required in many a country. Given that there is presumably a cost implication, I can't see such cables, even if/when available, coming into widespread use in UK unless/until it becomes 'required' (by BS7671).

"about bl++dy time"

It's not a totally one-sided issue. One advantage of having a bare CPC in between the two live conductors is that it appreciably increases the probability that something penetrating the cable and coming in contact with a live conductor will also come in contact with the CPC - thereby causing a protective device to operate.

Kind Regards, John

 

[ericmark]

I really can't see a down side, I think it great.

 

[Murdochcat]

Hasn’t this been standard in Eire for a while now ?

 

[Sureitsoff?]

Interesting, if it's true. Such cables are, of course, already required in many a country. Given that there is presumably a cost implication, I can't see such cables, even if/when available, coming into widespread use in UK unless/until it becomes 'required' (by BS7671).



Kind Regards, John

in the video doncaster cables say they will sell it at the same cost as normal twin and earth

 

[JohnW2]

in the video doncaster cables say they will sell it at the same cost as normal twin and earth

Again, interesting, given that it presumably must cost a little more to manufacture (PVC does not come at zero cost).

I suppose a lot will depend upon the extent to which other manufacturers follow suit but, even if they do, and even if there is no cost penalty,I suspect it would be a very long time before it came to be in widespread use, unless/until it is 'forced' on us by regulations - and many decades beyond that before UK installations were devoid of cables with bare CPCs.

Kind Regards, John

 

[JohnW2]

I really can't see a down side, I think it great.

Well, I've mentioned one (small) downside - and I suppose a related one is that it may, at least in some cases, delay the detection of cable damage/deterioration by IR testing.

What do you see as the 'upsides', other than removing the need for G/Y sleeve at terminations?

Kind Regards, John

 

[JBR]

It's not a totally one-sided issue. One advantage of having a bare CPC in between the two live conductors is that it appreciably increases the probability that something penetrating the cable and coming in contact with a live conductor will also come in contact with the CPC - thereby causing a protective device to operate.

I'm not an electrician, so I suppose I should keep my gob shut! However, I agree that a bare earth wire would be advantageous in such situations. Perhaps I must have missed something, but what is the advantage of having an insulated earth wire, apart from any proposed legal requirements?

 

[securespark]

Quicker, easier and cheaper to terminate.

 

[JohnW2]

I'm not an electrician, so I suppose I should keep my gob shut! However, I agree that a bare earth wire would be advantageous in such situations.

Indeed - and also, as I subsequently added, in some situations would enable cable damage/deterioration to be detected somewhat earlier by IR testing.

Perhaps I must have missed something, but what is the advantage of having an insulated earth wire, apart from any proposed legal requirements?

That's what I asked eric, but have yet to have a reply. As I said, the only (fractional) advantage I can think of is the avoidance of a need for G/Y sleeving at the terminations (and some people even discuss whether even that is actually 'required').

Kind Regards, John

 

[JohnW2]

Quicker, easier and cheaper to terminate.

As you will have seen, I acknowledged that - but do you think that that slightly increased 'convenience' is enough to overcome the (albeit small) 'safety' advantages I mentioned?

Kind Regards, John

 

[Risteard]

Hasn’t this been standard in Eire for a while now ?

It's not the same thing. This Earthsure or whatever it's called still had a reduced size CPC and it is an identifier rather than rated as insulation. The T&E in the south of Ireland has a full sized and insulated cpc, so is much bigger and more expensive. (It also can't be PVC for the past number of years.)

 

[ericmark]

We should fit earth sleeve, however whether simply not fitted, or fallen off, I have seen many installations where it is missing. And the back boxes are not that big that it is not possible for an earth wire not to touch a live one. I understand why the earth sleeve is missing, one has to buy such a huge hank of it.

 

[JohnW2]

We should fit earth sleeve, however whether simply not fitted, or fallen off, I have seen many installations where it is missing. And the back boxes are not that big that it is not possible for an earth wire not to touch a live one.

I'm very inclined to agree, which is why I always use sleeking but, as you will know, some people aree prepared to argue that it is not actually 'necessary' (or 'required')

I understand why the earth sleeve is missing, one has to buy such a huge hank of it.

One does if one wants a sensible price, but one can buy as little as 5m or 10m if one wants to. However, the cost is trivial - even 100m will cost only around £5 - £10, depending on size, and will 'last a lifetime'

Kind Regards, John

 

[securespark]

As you will have seen, I acknowledged that - but do you think that that slightly increased 'convenience' is enough to overcome the (albeit small) 'safety' advantages I mentioned?

Kind Regards, John

I was responding to JBR.