Red and black cables

[ARW]

And you should see the moulded plugs that are fitted to the UK appliances.

[harry]

Four core flex is available.

[damduck-egg]

Are there types of colour blindness that cannot distinguish between amber and white? Vertical white bars are used for traffic lights which apply to trams* as the go signal which could lead to an embarrassing mistake.

*in some countries for bus lanes as well.

G.Harman

[Scott]

Received from, I suspect, more than sent to.

[Scott]

I *think* I bought five core once for some mad job involving a central heating timer. I think I only used four though.

[spuorgelgoog]

No (as long as it's not damp), but you want to run it in gently at first ;-)

At that age it will be made of real copper, not the modern Turkish stuff now that has the consistency of aero 'chocolate'.

Owain

[polygonum]

Am happy to see other suggestions - especially for amber and green. Octagonal for red seems obvious.

[polygonum]

In my last house, Green & Yellow was used for something in the CH system, cylinder thermostat? Whatever it actually was, it was definitely a significant voltage relative to earth.

[Bob Eager]

I bought some six core for wiring our boiler. But the conductors were numbered, not colour coded.

[Capitol]

Trailer leads are multi coloured.

[KYW]

It's nothing like that.

[KYW]

Not enough to matter.

[John Rumm]

Never seen anyone re-purpose a CPC as an extra switched live? ;-)

[John Rumm]

Indeed.

No, I believe that is still the case. Obviously it needs over marking if re-purposed in a flex.

(I believe the logic is that in a flex its possible to unambiguously identify which wire it is at the other end, while that may not be possible / easy with loose singles).

[Tim Watts]

Strangely, no.

[Tim Watts]

That at least makes sense. Personally, I still don't like it.

[Scott]

Long time ago I installed a new timeswitch I think it was and it needed more than two cable so I found five core cable that I think was heat insulated to avoid that very problem.

[Scott]

Sorry, it was five core flex.

[Vir Campestris]

Charles has it right. It's not male only, just much rarer in women who need 2 defective copies of the gene.

Andy

[polygonum]

There are forms of colour blindness which have much wider effect. And there are many acquired forms.

I myself suffered from temporarily reduced colour vision - as if someone had turned down the chrominance on my vision just a touch. It returned to my "normal" some months later after treatment. (Not that vision was mentioned once with respect to my condition, nor is it in most documentation except in a few rather less known research papers.)

Some forms result in monochromatism - though these more serious forms may inhibit driving safety too much on their own.

My experience is one factor behind my suggestion of adding shape as a distinguishing feature.