EHU 2.5mm flex

[toad a caravan]

One example I once came across was a three phase motor running off 2.5 mm twin and earth,I told the owner who wasn't aware of a problem,Next day I called back having isolating previously and carried out several other issues with it

 

[GUMPY]

I would guess that well over 70% of caravan cables don't meet the HO7RN-F standard.
General PVC cables don't , Arctic cable doesn't
I know neither of my cables do, really must get around to changing them.
HO7RN-F is a specific type of EPR/PCP based cable which anything with a PVC sheath isn't.

I won't mention cables built without ferrules as that a whole other can of worms 😉

 

[JTQ]

I won't mention cables built without ferrules as that a whole other can of worms 😉

Oh please do, I want to understand what used in this context these "ferrules" are and the attributes they bring. I suspect I can't be alone in wanting to learn.

Re the quoted HO7RN-F spec, AI search is coming up with "Voltage Rating: 450/750V for flexible use, with higher ratings for fixed installations. "
So on the face of it not really required for our 240 VAC EHU application?

 

[GUMPY]

HO7RN-F is the cable specified under BS7671 to be used for caravan hook up cables.

As for ferrules they are crimped over the copper strands of a cable to prevent the screws in the connector from breaking/damaging the cable strands.
Many people just don't bother with them.

 

[JTQ]

Thanks.
Yes, now found that spec, "or equivalent" is called up.

Bedtime reading for those of us still in the willing to learn phase.

One German EHU cable I recall did feature those brass crips on the core ends.

 

[AndrewAventura]

When I was in France this summer and came across a 'reverse polarity' hookup I was very pleased to find that my EHU cable (new in 2024) needed no tools to remove the plug, nor even swap the conductors because the wires (equipped with ferrules) terminated into those quick wire sprung connectors.

 

[GUMPY]

When I was in France this summer and came across a 'reverse polarity' hookup I was very pleased to find that my EHU cable (new in 2024) needed no tools to remove the plug, nor even swap the conductors because the wires (equipped with ferrules) terminated into those quick wire sprung connectors.

Being really picky. When assembling IDC connectors one should not use ferrules since the IDC connection grips bare wires better😱

I used to prefer building IDC cables as I could build twice as many in a given period and since I was on piece work it paid double.