Running of distribution cables

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Mark1977

Mark1977

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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.
 
Pictures could help. Sounds like a cable tray job as that can ride up and down over obstacles.
 
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Mark1977 said:
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.
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Mark, with respect we will need a lot more information than what you have provided so far.
A photograph or several would be useful
What type of warehouse what materials are kept there?
What is the building constructed of?
Why is the new supply so far away from the existing?
Will the existing supply be completely removed
Is the existing busbar chamber large enough to cope with 50% more loading

Lots more questions but can't think of them at this time.
 
I haven't got that far yet to be honest. I've just had a look at the job. WPD are proposing to install a 200A CT panel but it's on a wall 90 degrees to the existing. I was thinking SWA but I was wondering about the bending radius on the internal bend as the cable I'd imagine is going to be 70mm and how I would get around this internal 90
 
Sorry there isn't much information to go on. I'll try and upload some pics. Thanks for your replies by the way.

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IMG_5753.JPG


IMG_5754.JPG
 
Yes these are the existing installation pics. The existing incomer is to the left of the brown door. The proposed new incomer is to be installed about 10m across to the right of the brown door on the wall 90 degrees. Where the green fuel tank is currently.
 
Mark1977 said:
I haven't got that far yet to be honest. I've just had a look at the job. WPD are proposing to install a 200A CT panel but it's on a wall 90 degrees to the existing. I was thinking SWA but I was wondering about the bending radius on the internal bend as the cable I'd imagine is going to be 70mm and how I would get around this internal 90
Click to expand...

A pair of bends on each wall can kill bending problems,you could mount it on a tray with a step up or down in the corner
 
Mark, you still haven't confirmed that the existing will be removed, sorry to keep on Mate, I guess the question should be will you be doing a complete rehash of the distribution switch gear?
 
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What would you fix the tray to? I'm not sure the metal panelling would be very strong for fixing to and the block work would be to low and liable to damage with forklifts around
 
Mark1977 said:
What would you fix the tray to? I'm not sure the metal panelling would be very strong for fixing to and the block work would be to low and liable to damage with forklifts around
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The brickwork looks favorite to me, hasn't bothered the gas meter people has it? You could always use Metal Trunking as a way of getting from A to B
 
Mark1977 said:
That's true, although there is racking along the block work and there's a good chance of the cable being crushed by forklifts loading and unloading the racking
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Wouldn't be much of a fork lift driver if he hit the racking and the cable, have to be going some to crush a 70mm2 SWA
 
Ok. Thanks for all your advice. It's very much appreciated. I've just been reading through the WPD paperwork and it specifies that "The tails should be Tri-rated cable" Does anyone know if SWA is classed as Tri-rated?
 
Mark1977 said:
Ok. Thanks for all your advice. It's very much appreciated. I've just been reading through the WPD paperwork and it specifies that "The tails should be Tri-rated cable" Does anyone know if SWA is classed as Tri-rated?
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Trunking it will be then, does that answer your question? Mark you need to take stock, do you think in all honesty you are up to doing this work.
 
Pete999 said:
Trunking it will be then, does that answer your question? Mark you need to take stock, do you think in all honesty you are up to doing this work.
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It confirms what I already had in mind to an extent. I thought I would ask others their advice incase there was a better way. Why would I not be up to doing this work Pete?
 
Mark1977 said:
It confirms what I already had in mind to an extent. I thought I would ask others their advice incase there was a better way. Why would I not be up to doing this work Pete?
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Some of the questions you have asked, I really didn't intend to be rude or disrespectful Mark
 
Obviously you have a better idea of any possible issues with any of our suggestions because you know the layout first hand

From what I can see,you have a lot of blockwork to play with on the door wall, perhaps you could make use of that lower wall by sitting it on the top of the blocks (not sure if you need to pass that steel upright)
 
Des 56 said:
Obviously you have a better idea of any possible issues with any of our suggestions because you know the layout first hand

From what I can see,you have a lot of blockwork to play with on the door wall, perhaps you could make use of that lower wall by sitting it on the top of the blocks (not sure if you need to pass that steel upright)
Click to expand...
There are obstacles galore Des. It's not a straight run by any stretch of the imagination. I haven't got the most experience with tray and trunking so was hoping for some inspiration!! I'll work it out!!
 
tri rated singles in galv. trunking then. some nice metal crunching for you.
 
Cable basket is much easier to install than Tray in my opinion , can be easily cut with large bolt cutters and bent into shape, angles are held in position with fixing clamps.
 
Mark1977 said:
Ok. Thanks for all your advice. It's very much appreciated. I've just been reading through the WPD paperwork and it specifies that "The tails should be Tri-rated cable" Does anyone know if SWA is classed as Tri-rated?
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Mark if they are fitting a CT chamber are you sure the Tri rated is not just from the CTs to the meter?
 
Billsays said:
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.
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I think that's a good idea as I read the same thing on another DNO's website
 
Mark1977 said:
I think that's a good idea as I read the same thing on another DNO's website
Click to expand...

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.
 
Billsays said:
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.
Click to expand...
I would have thought that after the DNOs meter what you do is your own business, design it properly no problems.
 
Billsays said:
EDF specifically say not to use tri-rated for the meter because of problems with tightening up the terminal on the tri-rated cables.
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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.
 
freddo said:
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.
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CT chambers have solid bars. IMG_5660.PNG

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.
 
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.
 
freddo said:
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.
Click to expand...

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!:smiley:
 
Billsays said:
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.
Click to expand...

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

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