Type of supply tncs or tt

[newfutile]

Ukpn have put a supply in for us to feed an outside cabinet, which will eventually supply foul water, sewage pump's.

They have supplied an earth but they have refused a meter until we supply a TT earth and a 30 ma rcd.

I have now done this and I measured 20 ohms between our earth and there's.

Has anyone come across anything like this before?

 

[123]

Is the current supply classed as temporary (eg for power for the site whilst works are ongoing)?

 

[newfutile]

I think he did mention that it’s classed as temporary,even though it’s not really and once we have the pumps I will wire them to there own rcbo, I only fitted a socket for convenience and so UKPN can do a polarity test.

 

[nicebutdim]

Is the current supply classed as temporary (eg for power for the site whilst works are ongoing)?

16A interlocked socket in place of the 13A outlet?

 

[mainline]

Ukpn have put a supply in for us to feed an outside cabinet, which will eventually supply foul water, sewage pump's.

They have supplied an earth but they have refused a meter until we supply a TT earth and a 30 ma rcd.

I have now done this and I measured 20 ohms between our earth and there's.

Has anyone come across anything like this before?

What's their Ze and your Ra

 

[newfutile]

There is no meter fitted yet so can't do a Ze can't do an Ra either all I could do was measure 20 ohms between the 2 earth's

 

[davesparks]

There is no meter fitted yet so can't do a Ze can't do an Ra either all I could do was measure 20 ohms between the 2 earth's

You don't need power to measure Ra.

 

[davesparks]

I thought the seperate earth block like that was how UKPN normally supply a TNS earth, are they using that method for TNCS now as well?

 

[Dave OCD]

I thought the seperate earth block like that was how UKPN normally supply a TNS earth, are they using that method for TNCS now as well?

The supply cable size looks more like concentric so I'd say they've fitted the external earth block for TNCS.

 

[Eric12]

TN-S or TNC-S, I've no idea why they've provided an earth but say you cannot use it (if im understanding correctly), be interested to know why !

 

[Dave OCD]

TN-S or TNC-S, I've no idea why they've provided an earth but say you cannot use it (if im understanding correctly), be interested to know why !

I think they'll only accept TT for what they class as temporary supplies but once the fixed installation is complete it's fine to connect to the DNO earth.

 

[nicebutdim]

I think they'll only accept TT for what they class as temporary supplies but once the fixed installation is complete it's fine to connect to the DNO earth.

Would be worthwhile for OP to read section 704 of the regs. Wrong guy turns up from DNO and may refuse to connect again.

 

[Rockingit]

My guess is that they'll have provided a TNCS supply but as far as they're concerned it's still a building site, for which TNCS is prohibited, hence why you need a temporary TT with RCD in place.