The data sheet (https://lapplimited.lappgroup.com/products/online-catalogue/power-and-control-cables/special-applications/photovoltaic/oelflex-solar-xls-r.html?type=1664268841) seems to suggest it's fine for AC up to U0/U : 600/1000 V (DC U0/U : 900/1500 V) - so no worries on that score.

It'll be insulated & sheathed - so deemed to give shock protection by double or reinforced insulation, provided it's suitable for the environment (as as for the d.c. side). If it's exposed to sunlight it might even to be an improvement on most conventional cables that have no defined UV resistance.

The ends would have to be identified (e.g. brown/blue/G/Y sleeving or tape) but that's doable. Likewise might need some care with termination (not all terminals are good for fine stranded) - but at worst a ferrule should sort that.

No good for direct burial underground of course, on concealed in walls without a 30mA RCD, but there's no suggestion that it's been used that way.

All in all, it's unconventional, but I don't see why couldn't be made to comply.

   - Andy.

You mean this?

The datasheet (and cable marking) says it's rated for 600/1000V for AC, so in theory usable; perhaps consider similar to a double-insulation outdoor-rated version of tri-rated. Whether the installation it conforms to BS7671 will depend on the details e.g. risk of mechanical damage etc.

Note that the conductors will be class 5 stranded and tinned so may need treatment (ferrules) in terminations, depending on the equipment.

Lapp say it's UKCA marked so should conform to some standard, but I can't see which on the datasheet. I can't find it on their CPR register either. (Do let me know if you find it)

PS Beaten to it, darn telephone! (c:

Jam said:

Lapp say it's UKCA marked so should conform to some standard

There's a Technical File approach to Regulatory Marking.

Normally for Solar DC cable in the EU the standard would normally be EN 50618, cable type H1Z2Z2-K.

Cables to the standard are required to be marked along their length with:

• Manufacturer's name, trademark or number
• Cable type 'H1Z2Z2-K'
• Nominal cross-sectional area e.g. '6 mm²'

BS EN 50618 cables have a nominal DC voltage of 1.5 kV between conductors, and between conductors and Earth.

Regards BS 7671 compliance, if the cable is not to a British or Harmonized standard, see Regulation Group 511 (particularly the requirement of Regulation 511.2, and confirmation and recording of such in the same Regulation).

Regards BS 7671 compliance, if the cable is not to a British or Harmonized standard, see Regulation Group 511 (particularly the requirement of Regulation 511.2, and confirmation and recording of such in the same Regulation).

That would be the same whether it was used on the d.c. or a.c. sides - on that score it might be considered 'inconsistent' to accept its use on the roof, but not elsewhere.

   - Andy.

AJJewsbury said:

on that score it might be considered 'inconsistent' to accept its use on the roof, but not elsewhere.

Agreed ... the issue with cables having a constructional standard etc., are definitely general advice, and applicable for all cables selected for a BS 7671 installation.