Running of distribution cables

[Mark1977]

Hi, I'm looking for some advice regarding running of distribution cable around a warehouse. My client is having a new 200A supply installed but this will be on a different wall approx 20m away from the existing 100A supply. I need to run a cable from the new supply to the existing busbar chamber and I'm looking for advice on which cable and containment methods would be best. There are a cables, conduits and pipes I would need to get over on the way. Any help would be greatly appreciated.

 

[Mark1977]

Mark if they are fitting a CT chamber are you sure the Tri rated is not just from the CTs to the meter?

This is what the paperwork says

 

[Billsays]

This is what the paperwork says

View attachment 37690

Ask them for clarification Mark, I've done plenty of these and have never used tri-rated, in fact EDF specifically say not to use tri-rated for the meter because of problems with tightening up the terminal on the tri-rated cables.

 

[Mark1977]

Ask them for clarification Mark, I've done plenty of these and have never used tri-rated, in fact EDF specifically say not to use tri-rated for the meter because of problems with tightening up the terminal on the tri-rated cables.

I think that's a good idea as I read the same thing on another DNO's website

 

[Billsays]

I think that's a good idea as I read the same thing on another DNO's website

Also check about isolators, you will need one as a single point of isolation probably above the new head before the ct chamber, not sure if you need one after it as it's a 20M run, then one before the new Busbar chamber. 3 x 200Amp isolators push the price up a bit! Best check with the DNO see what they want.

 

[Pete999]

Also check about isolators, you will need one as a single point of isolation probably above the new head before the ct chamber, not sure if you need one after it as it's a 20M run, then one before the new Busbar chamber. 3 x 200Amp isolators push the price up a bit! Best check with the DNO see what they want.

I would have thought that after the DNOs meter what you do is your own business, design it properly no problems.

 

[Billsays]

I would have thought that after the DNOs meter what you do is your own business, design it properly no problems.

Your right Pete, it wouldn't be the DNOs decision. I think just another isolator before the busbar would suffice.

 

[freddo]

EDF specifically say not to use tri-rated for the meter because of problems with tightening up the terminal on the tri-rated cables.

Surely the cables will be in crimp lugs to attach to the bolt terminals in the cutout? Much easier to feed through the CTs than standard tails.

 

[Billsays]

Surely the cables will be in crimp lugs to attach to the bolt terminals in the cutout? Much easier to feed through the CTs than standard tails.

CT chambers have solid bars.

You don't thread the cables through the CTs anymore.

Never installed tri-rated in a CT chamber normally either a swa or normal singles. Only ever worked in London/Essex though so it might be different elsewhere.

 

[freddo]

Interesting, the last 4 I did all went to the cutout fuses. I've never seen on like that before. Perhaps not used often in this part of the country.

 

[Billsays]

Interesting, the last 4 I did all went to the cutout fuses. I've never seen on like that before. Perhaps not used often in this part of the country.

The one in the photo is a Ryefield and I know the Blakely is the same, I've never seen any other type! Must be regional.
That's why I like this site, every days a school day!

 

[Deleted member 26818]

UKPN won't allow tri rated cables for CT chambers either.

 

[davesparks]

Also check about isolators, you will need one as a single point of isolation probably above the new head before the ct chamber, not sure if you need one after it as it's a 20M run, then one before the new Busbar chamber. 3 x 200Amp isolators push the price up a bit! Best check with the DNO see what they want.

Why would the length of the run require an extra isolator? It would require overcurrent protection if it's over 3m certainly,