Type of DNO supply question

[brenfox]

I was installing a new control panel in a pumping station kiosk the other day. Sometimes I am required to `enter` the DNO supply to insert the earth cable on what is normally a TNCS system. To my surprise the supply was a single core with the armourings supplying the system earth but no neutral. Not sure what to think of this? Pretty sure this works fine in electrical theory but...

 

[Leesparkykent]

sounds like concentric cable that's CNE.

 

[snowhead]

the supply was a single core with the armourings supplying the system earth but no neutral.

Concentric cable.

Are you certain about that statement?

 

[Leesparkykent]

......

 

[7029 dave]

I was installing a new control panel in a pumping station kiosk the other day. Sometimes I am required to `enter` the DNO supply to insert the earth cable on what is normally a TNCS system. To my surprise the supply was a single core with the armourings supplying the system earth but no neutral. Not sure what to think of this? Pretty sure this works fine in electrical theory but...

It will be concentric cable, associated with TNCS/ PME earthing.

 

[brenfox]

Thanks for the info, concentric cable is a new one on me.

 

[westward10]

The other type you may come across is split concentric, where you have the single core and two layers of conductor one normally unsleeved and the other sleeved over each conductor.

 

[brenfox]

Concentric cable.

Are you certain about that statement?

and neutral.

 

[driverman]

I would of thought you should firstly inform the DNO that you wish to use their earthing arrangement.
Also, you shouldn't be connecting directly to the DNO equipment.

 

[brenfox]

I would of thought you should firstly inform the DNO that you wish to use their earthing arrangement.
Also, you shouldn't be connecting directly to the DNO equipment.

I connected to the DNO via a fused isolator upstream from the meter.

 

[davesparks]

I connected to the DNO via a fused isolator upstream from the meter.

Well then you're going to be in deep trouble when the DNO/meter operator catch up with you. Connecting to the supply upstream of the meter is theft of electricity!

 

[7029 dave]

Well then you're going to be in deep trouble when the DNO/meter operator catch up with you. Connecting to the supply upstream of the meter is theft of electricity!

I think you know what he means..?

 

[davesparks]

I think you know what he means..?

Yes he means he's connecting in to the supply before the meter doesn't he?