6-core ≥230V-'rated' flex?

[aptsys]

https://uk.farnell.com/pro-power/ppyy7c0-75/cable-yy-7-core-0-75mm-per-m/dp/1891211
£1.69/m

 

[JohnW2]

https://uk.farnell.com/pro-power/ppyy7c0-75/cable-yy-7-core-0-75mm-per-m/dp/1891211
£1.69/m

Thanks. I wonder if that is the same, or similar, to the one from TLC (about which there are few details given) which was mentioned early in this thread ( here .?

Thanks for all the input from everyone but, for the information, thanks to a "friend of a friend", I now have a couple of metres of suitable cable (acquired yesterday)!

Kind Regards, John

 

[donrkebab]

Do you know why 6 core cable has never been available?

 

[JohnW2]

Do you know why 6 core cable has never been available?

Well, as we've discovered, it is 'slightly available', but only just (in comparison with 5-core and 7-core).

I personally haven't got a clue as to the reason. One imagines that there is a lack of demand, but why demand should be dramatically less for 6-core than for, say, 7-core. Maybe there are common applications which require 5-core and 7-core, but not 6-core?

I've also tried to think of 'manufacturing' reasons, but I don't really see why it is any more difficult arranging 5 cores around a 'central' one than it is arranging 4 or 6.

Anyone got any ideas?

Kind Regards, John

 

[333rocky333]

3P N E
3P N E and 2 control wires

 

[JohnW2]

3P N E ... 3P N E and 2 control wires

Well, yes, I should have conceded that there would be a fair demand for 5-core - but is "3P NE and 2 control wires" necessarily more common than "3P N E and 1 control wire".

I actually suspect that once one gets beyond 5 cores the most common applications (like mine) are those in which multiple separately fed loads are being supplied by one cable (e.g. N E and a number of switched Ls).

Kind Regards, John

 

[RF Lighting]

7 cores are required for star delta started motors. I imagine that’s why 7 core became a conventional thing back in the day.

 

[donrkebab]

7 cores are required for star delta started motors. I imagine that’s why 7 core became a conventional thing back in the day.

Star delta motors require 6 cores, usually 2x3 cores, plus any control wiring

 

[JohnW2]

Star delta motors require 6 cores, usually 2x3 cores ...

What about a CPC? I imagine that's probably where RF's 7th one came from.

Kind Regards, John

 

[SimonH2]

I've also tried to think of 'manufacturing' reasons, but I don't really see why it is any more difficult arranging 5 cores around a 'central' one than it is arranging 4 or 6.

I doubt if it's a reason, but 6 cores around one central one is a natural layup without any fillers/spacers needed. 5 cores around a central spacer/filler is a necessity since 5 core is a commonly required cable.
It's possible that some manufacturers decided that by the time you add the fillers needed, 6 cores won't be all that much cheaper than 7 cores - and anything you can do with 6 cores can be done with a 7 core cable.