Parallel Supplies

[Guest 004]

Is there amything wrong with having a parallel supply, that will consist of 2 different size cables?

for examples say cable 1 = 25mm, cable 2 = 10mm.

To give a 35mm

 

[SPARTYKUS]

If you're on a Naval ship, at war in the middle of the sea and having to make do with whats available right now, then yes.

What is the context Mr Enigma?

 

[Guest 004]

my client wants to save money.

I have calculated that he needs a 35mm supply. He already has a 25mm supply, the run is 100m.

 

[telectrix]

433.4, 523.1, 523.7, and appx. 10. happy reading.

 

[SPARTYKUS]

I can't think of a regulation to quote you why its a bad idea, just feels bad.

For instance if you have two runs supplying the ... Supplied thing, and at a
later date one cable of the two is damaged / disconnected ..... Well then the other one may become overloaded without anyone noticing

 

[telectrix]

that could happen even if both cables were equal size.

if he insists on parallel conductors, at least run in another 25mm. then you'll have some extra capacity for future increase in loading.

 

[SPARTYKUS]

that could happen even if both cables were equal size.

Agreed

 

[kingeri]

My BGB is in the car but from memory I thought the cables would have to follow the same route and be the same CSA.....but I may well be wrong.

 

[Guest 004]

was thinking to use same size, and of course they will follow the same route, which wiould be in a duct in the ground. So good protection.

 

[Knobhead]

Sorry kid, both to be the same size and same route.

 

[SPARTYKUS]

50mm squared it is then!! You can up the demand

 

[Knobhead]

It doesn't work like that two 25s equal more that the CCC of a single 50. I know they are a pain but they work out better than a single cable.

 

[Guest 004]

2 x 25mm it is then.

Wonder what the CCC would be then?

 

[SPARTYKUS]

Im guessing (Tony) that it works out better because of better dissipation of heat maybe, as theres more surface area free to ... Dissipate?

 

[telectrix]

Im guessing (Tony) that it works out better because of better dissipation of heat maybe, as theres more surface area free to ... Dissipate?

i'll agree with that.

 

[Guest55]

twin / parallel feeds are pretty common on submains larger than 300mm.

struggling to think of anything else to add to be honest lol.

er , carry on.

;-)

 

[SPARTYKUS]

As you were, carry on. At ease?

 

[telectrix]

As you were, carry on. At ease?

it's sunday, stand easy.

 

[SPARTYKUS]

Defcon 2.

 

[telectrix]

def beer!!!

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defcon beer!!!