Lighting circuit

u pay any attention to product design you'll realise that the relative chea pness of today's goods is partly down to many such economising measures. Sp ending money pointlessly is not a positive move.

there are many ways one could reduce housebuild costs

No, it's already been pointed out that lack of lighting earth has killed pr ecisely no-one in decades. The expected risk has not materialised.

not seeing how it causes a fire risk. This sort of cable would only be for situations where it's not liable to get damaged in installation nor open to touch by end users after installation.

NT

Yay, quarter of an amp. There are also loads that are best put on 10A lighting circuits. So what.

NT

Cheap foreign labour and/or s*it materials springs to mind.

Any other suggestions?

ou pay any

once again: it would be for positions where there is no end user access.

It's already used today for mains wiring - but not in Britain.

NT

you've yet to provide any sound reason.

that is a real safety plus of rings.

myth, it is not dangerous. PVC's glass temperature is far above its 70C rating.

NT

The 2nd fault is a fire risk on a ring. The 1st fault is a fire risk on a radial. The ring is safer.

NT

All current RCDs are sutable for 0.1A or my proposed 1A or 1.5A. And yes, 3

NT

you pay any

Actually K&T was more expensive and has safety features that T&E type cable s abandoned. A nail through a modern cable can cause a partial short, not s o with K&T, and it's largely installed in floor-ceiling spaces. It also had conductors separated from joists by ceramic fire-proof sheaths. Poor conne ctions, thin conductors and much worse fuseboxes made it worse overall.

House wiring with uninsulated cables has been studied. While they might wor k buried in dry concrete, the first time there's a leak things go wrong.

NT

Wylex plug & socket?

NT

As an electrician you should know better than that.

NT

you pay any attention to product design you'll realise that the relative ch eapness of today's goods is partly down to many such economising measures. Spending money pointlessly is not a positive move.

There's a whole bunch of alternative housebuilding methods that have yet to be studied & approved by UK BR. Doing so would be a real move forward.

In the realm of existing methods, to pick something random, thinner joists would save a few quid. And no, for the benefit of those that have not studi ed the matter current joists sizes have nothing at all to do with safety.

NT

A fault in a radial will not pick up a missing earth.

I see you have had sip out of the S*it Goblet.

I see you have had sip out of the S*it Goblet.

Batten down the albatross, the banana is coming!

But standard T & E or flex is more robust. And the IMHO the flex in round PVC form looks better if left exposed. Or telephone extension wire (stranded version) for short distances.

And that is the way it can stay...

Why do you suppose with have massively lower electricity related injury rates and death rates than many other countries? Its because we insist on higher standards and better quality materials.

How many have suffered serious injury from an unearthed metalwork made live by a fault?

How many hospital admissions?

How many burns?

How many bruises and lacerations?

How many cases of atrial fibrillation?

There are lots of wiring practices that have evolved with time to make electrical systems less likely to injure and maim. Many were put in place to address real issues that were causing harm. A borrowed neutral on a lighting circuit probably never actually killed anyone, however there are good sound reasons why its not permitted now.

To quote your own words from the wiki: "mains fatally electrocutes around 20 people a year in Britain, and shocks over a million"

You may not be able to do much to reduce the 20, but one can still make big inroads into the million.

That pretty much rules out anywhere in a domestic setting. (think in terms of rodent damage and any number of other ways cables are vulnerable even when not readily accessible to the end user).

Think also of the techniques we use to prove an electrical system is safe and working correctly, like using insulation resistance testing. How is your installation going to test with hidden lengths of poorly insulated twin cable?

How are you going to assess round trip circuit resistances when you have unknown lengths of smaller CSA conductors dotted about the place?