Advice on cable size

[Andy’M]

Hopefully some of the electrical gurus on here can give me some advice.
From hook up socket to consumer unit 2.5mm.
From consumer unit to standard socket 1.5mm
My question Is there any reason not to use 2.5mm for the whole system thanks for any input.

 

[Dellmassive]

Use 2.5mm throughout.

That will enable you full power from any point.

Fatter cable = less volt drop / better power.

 

[Andy’M]

Thanks Dellmassive

 

[jayc001]

1.5mm² is rated at 14A in insulation or 19A clipped direct. With a voltage drop of 30mv per meter the most you'd lose in a typical T6 run would be 300mv.
Why go to the extra cost and hassle of pulling 2.5mm²?

If you already have a roll of 2.5mm² then yes I'd argue maybe not worth the extra expense but I see no justification on running 2.5mm² radials in a van.

 

[Stay Frosty]

Sounds like an answer from someone fresh from an 18th edition revision test.
I would carry on using 2.5mm2 as Lee said and use stripped up blue arctic flexible cable if space is tight but either way flexible cable and not twin and earth solid core.

 

[jayc001]

Sounds like an answer from someone fresh from an 18th edition revision test.
I would carry on using 2.5mm2 as Lee said and use stripped up blue arctic flexible cable if space is tight but either way flexible cable and not twin and earth solid core.

Not quite. I design mobile AC and DC power systems for a living. Where there are space and weight constraints exist overspec cable sizes provide no benefit.

Of course if you've bought a roll of 2.5mm² already go ahead and use it, there's nothing wrong with overspec in this scenario.

 

[Andy’M]

Thank you all for the clarification I have plenty of 2.5mm arctic blue multi core cable to reach the sockets and 20mm conduit already run so space is no issue. I think I probably didn’t worded my question very well it should have been is there a safety reason to not over spec the cable from consumer unit to sockets.