Interesting 4 core flex ...

[Octopus]

Came across this today...

When fault finding a boiler control change ....

 

[Pete999]

Can't see what the problem is!

Don't think there is a problem, they are just debating the odd cable, I think

 

[westward10]

It isn't odd.

 

[Toneyz]

I've got some 4 core flex that has the 4th core as red flex fully compliant.

 

[PEG]

I have seen that before,has it got anything between the outer sheath and the cores?

It was a while ago,but it used to come from RS components,and was used in mobile cabins and the like.

 

[Pete999]

It isn't odd.

OK they were debating the cable that some people thought was a bit different, or something that they hadn't seen before, relating to the colours of the cores within the outer protective sheathing, apparently to some it was something worth mentioning, obviously in your opinion not worth a mention.

 

[Lucien Nunes]

I haven't seen that flavour before either. Of the pre-harmonisation 4-core flexes with one core as CPC, I've seen brown/black/blue and brown/black/black, maybe brown/brown/black, but never brown/brown/blue. My favourite is still the old UK 3-phase flex, red/white/blue/green, which is still in use on a few of our older machine tools.

 

[marconi]

Is the brown, brown, blue, green/yellow flex sold so that combined luminaires which have lamps for both general and emergency lighting can use one brown as a switched live and the other brown as a permanent live? Might be useful if the luminaire is suspended to avoid running two flexible cords to it.

 

[Hellmooth]

Is the brown, brown, blue, green/yellow flex sold so that combined luminaires which have lamps for both general and emergency lighting can use one brown as a switched live and the other brown as a permanent live? Might be useful if the luminaire is suspended to avoid running two flexible cords to it.

I would think having a black sleeved brown would be easier to work out which was which.

 

[marconi]

I wonder if the brown, brown, blue and green/yellow is used to identify conductors for a split phase application such as a 3 wire 110V supply - 55-0-55V derived from a single secondary winding centre-tapped and earthed? Both browns being labelled L or L1? For a classic four wire three phase supply one would use the new harmonised colours (or label L1, L2, L3) to identify each phase with respect to the neutral.

Just a thought.

 

[a-z electrics]

I would have thought having two wires with the same colour in a group is a recipe for confusion.. for that reason I never use the twin brown flat cable for switching, i prefer to use the standard brown / blue and flag the blue, thus differentiation between permanent and switched line.. I suppose there's an advantage in having two browns if one ever had to break into the cable at some other point? But you still wouldn't know which is which..

 

[Octopus]

^^ I agree, but I had to work with what was in place, so it took longer to confirm which cores were what ...... all up and running now!