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cable selection 600amp 3 phase

Discuss cable selection 600amp 3 phase in the Commercial Electrical Advice area at ElectriciansForums.net

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Johnthefixer

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Hi wondering if anyone has any advice on what type of cable would be best.

I need to run a 600amp 3 phase feed with neutral using single core with power lock connectors for just under 50meter across the open floor with short sections in cable ramp, from this it will be broken down into 3x 125amp 3 phase connectors each taking just under 100amp per phase.
This will feed some 3 phase equipment and also break down into several single phase supplies.
For shorter runs of this I have used H07RNF at 120mm, but wondering on sizing for this length run and if there are alternatives to H07RNF that would give us the same current capacity still be flexible enough to move and keep with in our voltage drop.
Thank for any help.
 
The OP has asked a question there is no need to drill him over his qualifications. The offending and now not relevant posts are gone.
 
No offence taken quite happy to be asked. my questions is more of a general enquiry, in case I have missed a type of cable that could be use. Your link to the cleveland trirated is for panel wiring cable is this not really suitable for laying on the ground in exposed areas?
 
Glad you understand but these questions can quickly throw a thread off course and at times stop new members pursuing the thread.
Yes tri rated conductors would require additional protection.
 
You need to do some calculations taking volt drop into consideration but it will be 500 to 630mm. I would suggest contacting Cleveland or Eland cables for an accurate sizing.
 
From memory the larger size of powerlock connector takes a maximum of 300mm so that's going to limit the size of the cable.

Why do you need 600A if its only being split to 3x 125A? That would work quite happily on a normal 400A powerlock set.

Is this a temporary installation? If not why use powerlock? And if it is then surely you'd just hire in the required standard sized cables or use from stock?
 
essex said:
Have you considered dual feeder?
Click to expand...

Technically it would be possible to do this with powerlocks but it would require the distribution equipment at each end to be well designed and custom built as no one is likely to have that on the shelf. Powerlocks are basically single pole plug/socket connectors used to make high current extension leads, they are used by DNO's to connect generators into the network (usually a bright orange cable) and in the entertainment industry for anything and everything.
 
I would be looking at installing in a tri-foil cable arrangement with either 3 or four runs, the arrangement of the phasing here in this setup is crucial and should be researched if you are new to it, the magnetic fields generated need to be arranged correctly so you cannot simply run a tri-foil of each individual phase and N you need to arrange them correctly, you can also lay them all flat and adjacent on a wider tray/ladder but again the arrangement is crucial.
This will thus vastly reduce cable size, installation issues and connection issues if the gear is chosen carefully, there are many hurdles here to get around so it would be wise to get in a designer or manufacturer of chosen equipment to ensure it is the correct solution, a minor error can be a costly outcome here.
 
Thanks fo all the input so far, going over some of the responses, firstly there is cost, running secondary feed may be an option but that puts us from 5 cables to 9 ( considering a single cpc ),
Most 660amp power locks only take up to 300m, but you can get 750amp and 800amp just trying now to find out if the can take larger cables. the distribution equipment is not a problem as I will make that to suite if we haven't already got it. this is for a temporary event, but I am used to multiple source and not such long runs which is why I am picking you clever lots brains in case I can find an alternative way of achiving the same thing as I think i will have to do, which is split the load at source and run secondary feeds to second distro and split the loads to smaller chunks.
Oh and one other thing sorry Dave sparks the 3x125 are 3 phase 100amps per phase. so 600amp max draw.
Darkwood sugested tri foil cable, but mentioned difficulties layout, I Have not worked with this, so I will have a look at it. do it need extra protection?
 
Tri-foil cable is how you would arrange the singles not a type of cable, it requires the phasing magnetic fields be configured in a standard arrangement, this is also applicable when running parallel singles so you will need to look for the phasing arrangment anyway. If your supply and load solutions can take multiple cores per phase then this is the way to go most definately, it is quicker install, simpler termination and can reduce allover copper equivelant sizing.
If you want to see what I mean then google tri-foil cable arrangement 3 phase to understand your options.
 
Johnthefixer said:
Oh and one other thing sorry Dave sparks the 3x125 are 3 phase 100amps per phase. so 600amp max draw.
Click to expand...

3 x 3 phase 100 amps per phase gives a total of 300 amps per phase so you need a 300A supply, not 600A.
Different companies rate the same connector design differently because it isn't governed by a standard the way that other connectors are such as cee type connectors or 13A plugs. They all, as far as I know, accept up to 300mm on the larger sized connector.
 
davesparks said:
For those who haven't seen powerlock connectors before, this is a 125A up to 400A powerlock adaptor out of our hire stock. The cable is 35mm H07RNF singles.

Normal powerlock cables are a set of 5 single core H07RNF cables with the source and drain (male and female) single pole connectors at each end.

View attachment 47069 View attachment 47070
Click to expand...
nice boots!
 

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