Electricity Northwest

[mikel]

Have a quote to complete for some work in out buildings at a farm. Having read the appropriate section regarding Agriculture buildings I see it says I cannot use a TNC earthing arrangement.  No problems as I'm thinking of making the outbuildings a TT arrangement.  Just out of interest I thought I'd contact the local DNO (in this case electricity north west) to find out what the earthing arrangements at the farm are.

I  spoke to a very helpful person who wasn't sure but promised to find out.  10 minutes later he rang back and said "we're not sure what it is, it is probably a TNS but may be a PME system.  We won't go and look unless you get a high earth loop reading...........................................

 So how would you determine what a high earth loop reading was if they can't tell you what earthing arrangements are there and thus what limits your looking at.

I know I can test the incoming supply, which would give me a reasonable chance of being right, but is a reasonable chance good enough?

 

[NozSpark]

You've got it a little wrong..

A farm cannot be supplied by a TNCS supply, AFAIAA TNS and TT earthing arrangements are OK, the dwelling of a farm can be TNCS IIRC

 

[mikel]

Sorry my bad explanation, your explanation was my understanding.  The only supply to the farm is too the farmhouse and thats the one they can't tell me what it is

 

[steptoe]

correct Noz

the OP needs to specify a farm, or a farm house, there is a difference.

why on earth would you need to contact the DNO regarding supply type? can you not see the incomer?

Your right but sometimes the DNO don't oblige and haven't a clue....

My friend has a farm, new supply a year or so ago (old supply in a different building is TT), new supply in a metal framed, steel roofed, open cow shed is TNCS with a DNO PME sticker on it......

:C

the DNO can supply whatever they want,

what you are permitted to use under BS7671 may be different to the supply type though.

 

[NozSpark]

Its pretty much all PME anyhow

 

[steptoe]

AFAIK they can supply you with whatever the **** they want, they are a law onto themselves,

what they will then allow you to do with it is completely different.

 

[steptoe]

:slap

have you seen the way my quoted post differs from my censored post? ,,,,,,,,

 

[Sharpend]

Oops! :slap

 

[steptoe]

Where is the difference ?  :innocent

would you like a screenshot????   :|

 

[Sharpend]

Subtle paddler :Applaud

 

[steptoe]

Please

ask Deke if Brian can get the archives up?

:C

thats something similar to what Hollies mum asked me,

Im sure she said could I get the archives up................  :|

 

[kme]

So how about this.

On a farm, there are two 11KV, 2 wire overhead poles.

each pole has a TX on it.

One TX feeds pair of domestic service heads ( one from each phase) - which supply the farmhouse, holiday rental cottages, farm outbuilding submains etc.

That service head is TN-C-S

The other pole is in the middle of a field. There`s a white meter box, screwed to the bottom of the pole, with a head, meter, and tails to a 16A commando.........THAT one is TT - and the commando feeds a caravan >100 yds away; AND a trailing extension lead in the greenhouses :slap