CT wiring diagram

[DHES]

Afternoon all
Does any body have a wiring diagram for the installation of CT'S into a ryfield ct chamber.
I have installed the chamber and the eon meter installer had said it is my responsibility to wire the CT'S and do all the interconnecting cabling to allow him to fit a meter. I have had a very quick look at Google but cannot seem to find anything.
Can anybody help?

 

[Bobster]

What type of meter are you connecting to?

 

[DHES]

I don't actually know eon have given no info at all.
All the info I have is its an 80kva supply.

 

[Knobhead]

From the Ryefield site

IMPORTANT
In June 2013 we understand that there were changes in legislation, which transferred responsibility for the provision of CT chambers. In some instances this has taken the responsibility away from the electrical contractor / installer and passed it to the electricity supplier. Before ordering a CT chamber, please confirm who has responsibility for supplying the CT chamber with your electricity supplier.

 

[DHES]

Yeah wish my wholesaler had told me this beforehand.
I popped into ryfield Friday but they never had any diagrams to help although Vince tried and had a look through all his paperwork it no luck. That's why I thought I'd try here

 

[DHES]

Sorry Tony misread your post.
I was happy to install the chamber but I was under the impression that the meter installer would provide the CT'S and the meter and all interconnecting wiring. But I'm now told this is not the case.

 

[Knobhead]

Have you got the CT’s? Post a picture if you have.

At the max there will be ten connections.

 

[DHES]

I have the CT'S they have 2 connection s each. I will post a pic in the morning when on site.

 

[Bobster]

I make 11 if he's decking one side of the CT's

 

[Knobhead]

I was thinking to the meter. I’ll not fall out over a bit of GY to the CT mono-block.

 

[Knobhead]

What surprises me is the metering company requiring the contractor to wire the CT’s. If I was billing someone I wouldn’t trust them to make the connections.

UKPN require a metering test block but looking on the Ryefield site I can’t see one fitted to the 400A unit.

 

[Engineer54]

I would have thought the CT'S would be supplied with the meter. Never heard of the DNO allowing a contractor to install and connect to any of their equipment. It makes no sense at all!! But then nothing much does in the UK today... lol!!

 

[DHES]

What surprises me is the metering company requiring the contractor to wire the CT’s. If I was billing someone I wouldn’t trust them to make the connections.

UKPN require a metering test block but looking on the Ryefield site I can’t see one fitted to the 400A unit.

Totally agree and I argued this point to the main builder and he just came back saying it's what they want just do it.

 

[Knobhead]

I suppose with Ryefied being a recognised supplier they meet the metering companies standards.

It will be interesting to see your photographs DHES. I checked on UKPN’s requirements and they ask for a test terminal block. BTW these aren’t just a row of terminals, they allow for testing the CT’s while under load and as metering equipment will be sealed.

Still seems weird to me.

 

[DHES]

The test terminal block comes in the chamber along with 3 fuse holders. It's just the wiring diagram it does not come with

 

[Knobhead]

Have a look at this

http://www.crompton-instruments.com/installation_docs/DRK-CT-INSTAL.pdf

 

[Bobster]

So once you've installed them, who's responsible for the correct functionality? Will UKPN come and commission?

 

[davesparks]

So once you've installed them, who's responsible for the correct functionality? Will UKPN come and commission?

You may have just stumbled across the reason why they want someone else to fit it!

Unlikely that UKPN will commission it if EON are the meter operators

 

[Bobster]

Didn't read the thread properly, I thought UKPN was looking after the meter as well.

So I'm guessing that EON must have to come and prove everything ok, if you were the dishonest type there's a few ways of making it read slower than it should!

 

[DHES]

Not really sure all I know is they want me to do all the wiring and they install the meter to the front of the CT chamber box. At the end of the day i have no interest in making it read slower all I want is to get paid and move on the the next job. Just wish they would have drawings of exactly what they need to see. Ie do I drill the hole in the front of the chamber for the meter to mount? If so how big and where would they like it. What size fuses do they need to de rate for connection to the meter. surly it can't be that hard to get the info together.

 

[Knobhead]

if you were the dishonest type there's a few ways of making it read slower than it should!

I was going to mention that earlier but thought better of it ;-)

 

[Bobster]

Not really sure all I know is they want me to do all the wiring and they install the meter to the front of the CT chamber box. At the end of the day i have no interest in making it read slower all I want is to get paid and move on the the next job. Just wish they would have drawings of exactly what they need to see. Ie do I drill the hole in the front of the chamber for the meter to mount? If so how big and where would they like it. What size fuses do they need to de rate for connection to the meter. surly it can't be that hard to get the info together.

I release you would't, it was just a coment on EON putting trust in other people. Just to add I wouldn't condone anyone doing this, and won't explain how on an open forum.

The only real way you can proceed is to find out what type of meter they would like to use.

 

[Stu1312]

This is happening a lot now especially in ukpn. although the ongoing ownership of the CT chamber, CTs and test block is the dno many are not charging for this as part of the new connection but passing the responsibility onto the customer. The meter operator is only responsible from the test block onwards so they often won't help with what's not their problem.

 

[Knobhead]

I’ll bet they’ll be interested in the CT chamber when their income is affected.

 

[DHES]

[/IMG]

 

[DHES]

This is what I've got.

 

[Stu1312]

Does that help?sorry picture hasn't uploaded will try again!

 

[DHES]

All I get is broken link on my phone
Sorry

 

[Stu1312]

Will try again!

 

[Leesparkykent]

Is the meter EDMI as it's EON?

 

[Stu1312]

The meter type won't make much difference as its the wiring on the ct side of the test block that needs to be installed, providing that is correct the meter operator will be responsible for all connections from test block to meter.

 

[Leesparkykent]

They could provide a diagram though.

 

[shanky887614]

Does that help?sorry picture hasn't uploaded will try again!

ive checked your pic, thats the wrong link, if you click on advanced, then img then browse to image it should upload.

if not can you upload to imgr or similar and link here

 

[Knobhead]

Page 90

http://eon-uk.com/downloads/EM_MoP_v1_0_1st_December_2008.pdf

 

[Leesparkykent]

DHES I've PM'd you.

 

[Stu1312]

Try again Upload the image directly to the thread

 

[DHES]

Page 90

http://eon-uk.com/downloads/EM_MoP_v1_0_1st_December_2008.pdf

Thanks Tony

 

[Knobhead]

Stu’s drawing will work, but they won’t accept two cores in a terminal block.

The whole idea of a test block is so things can be tested and isolated safely.

I’ve only worked on MV metering test blocks where the VT could be isolated by inserting insulated plugs on the voltage test block.

 

[Knobhead]

I use Red Yellow Blue Black simply because Brown Black Grey Blue can’t be seen on screen.

This is what EON will expect to see. G/Y is not used for the CT S2 connection to the test block.

 

[iwonder]

Hi guys, I have the exact same query and would like to see if there are any drawings for the connections.... all the links seem to be dead links.

Any help would be appreciated

 

[Pete999]

Totally agree and I argued this point to the main builder and he just came back saying it's what they want just do it.

Obvious to me, both the DNO and the builder have not a clue on how to do it, lots of parameters need to be specified, you can't just stick any old ct in, IMO the DNO is responsible.

 

[Leesparkykent]

Hi guys, I have the exact same query and would like to see if there are any drawings for the connections.... all the links seem to be dead links.

Any help would be appreciated

What makes the shorting block? You will normally be supplied a schematic when you purchase one. Could try trawling through the owen-brothers website to see if they have diagrams.