BS7870-3.11 DNO cable

perspicacious: 
 Dowsed for pipes and drains so no “incidents”…………………..

Is dowsing to be found in BS 7671? ?

perspicacious: 
 

New one on me from WPD.

New 45 kVA 3-ph service connection from existing OH distribution to be laid from pole to premise in asked for 2" rigid duct of our supply and burial.

Had to use my 75 mm mole in four pits to get under private drive and lawn so had to go quite deep to avoid mole rising. Dowsed for pipes and drains so no “incidents”…………………..

I was expecting 35 mm2 aluminium with copper wavecon but they used BS7870-3.11 cable that was 25 mm2 copper with a 25 mm2 fine wired outer and just slow spiral, not wavecon.

Consequently the outer diameter is just 23 mm and had I known, I would have used smaller duct and 55 mm mole to save going as deep as they only wanted 450 mm cover.

Apparently, no need for wavecon on standard service cable as can't take another service from it. 185 mm2 has to be used for two or more services which still has wavecon outer.

Regards

BOD

BS7870 Part 3, section 3.11 covers Cross-linked Polyethylene (XLPE) insulated combined neutral and earth copper wire concentric cables with a voltage rating of 0.6/1kV.

 

Conductor	Stranded (Class 2) plain annealed copper or solid (Class 1) aluminium
Insulation	Cross-linked Polyethylene (XLPE)
Bedding (for three phase cables)	Polyvinyl Chloride (PVC) or synthetic tape bedding
Concentric neutral / earth conductor	Single layer of plain annealed copper wires
Outersheath	PVC Type DMV 23

Look before you leap.

Z.

Is dowsing to be found in BS 7671?

Under 515.1 and 528.3.3 Chris!

Regards

BOD

What is the voltage drop of DNO cable the supply is 400 amp 3 phase  so presumably whatever cable is standard (PILC) as installed back in the 1960s  im asking out of curiosity assuming the transformer is tapped at 250/433 volts we get between 233 and 241 volts all well within spec and im not whinging about it just curiose to try to see how much load mite be on the street main

Does dowsing really work? I`ve always been very sceptical. Although I am aware of some instances here it is relied upon.A friend of mine, years ago, told me of a property he has in Portugal and they had arranged for this mega machine and operator - the machine cost a hell of a lot of money, really technology busting sort of thing at the time. Before they let the machine do its stuff though, they had to let "a bloke with his twig the check the ground".

The megga machine was to make a big bore hole for water and the twig was to find the water

Does dowsing really work? I`ve always been very sceptical.

I was also very sceptical ebee but I've really got into it lately. I can't get on with the traditional hazel twig nor the thin welding rods/coathangers but I tried some bespoke heavy forged rods and found them ok. However, my instrument of choice is just a simple, single 90 degree rod. I have to be in a fairly still air environment as strong gusts cause problems.

Having said that, I still use my CAT (not my familiar, a black cat!) and Genny if I want to know the depth of a buried cable. When no one is watching, I'm going to have a go at divining the depth of a pipe/drain!

Regards

BOD