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 is called up.

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

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