The 16A 220V breakers in my CU have a 1.5mm wiring, which is deemed appropriate.

 

16A x 220V = 3520 Watt.

 

Now I'm building a PC and have to extend the power wire to my DVD writer, which consumes about 30 Watt at 12 Volt = 2.5A

 

When I search what size of wiring I need, I get as result 1mm.

 

What am I missing here?

10 minutes ago, BenStark said:

The 16A 220V breakers in my CU have a 1.5mm wiring, which is deemed appropriate.

 

16A x 220V = 3520 Watt.

 

Now I'm building a PC and have to extend the power wire to my DVD writer, which consumes about 30 Watt at 12 Volt = 2.5A

 

When I search what size of wiring I need, I get as result 1mm.

 

What am I missing here?

I doubt you can buy cable less than 1 sq mm. Is the writer not connected via USB, or internally via SATA if that's what it is?

And what is a DVD writer used for these days......yeh, writing DVDs!

 

2 minutes ago, KannikaP said:

I doubt you can buy cable less than 1 sq mm. Is the writer not connected via USB, or internally via SATA if that's what it is?

And what is a DVD writer used for these days......yeh, writing DVDs!

 

My question was not what should I use a DVD writer for, so thanks for going off topic on each and every thread you enter.

 

I can get wires from 0.25 - 0.50 - 0.75 mm, but that was also not my question.

 

The question was why I need a 1mm wire for a 2.5A 30W load.

6 minutes ago, BenStark said:

My question was not what should I use a DVD writer for, so thanks for going off topic on each and every thread you enter.

Quotes and examples please.

1 minute ago, KannikaP said:

Quotes and examples please.

On my ignore list you go

7 minutes ago, BenStark said:

My question was not what should I use a DVD writer for, so thanks for going off topic on each and every thread you enter.

 

I can get wires from 0.25 - 0.50 - 0.75 mm, but that was also not my question.

 

The question was why I need a 1mm wire for a 2.5A 30W load.

You say you 'searched' for the correct cable size.  Where did you search please?

The SSDs in my PC are connected with 'bigger than 1mm' cables, mainly because SATA cables are made that way.

1 minute ago, BenStark said:

On my ignore list you go

Thanks.

1 hour ago, BenStark said:

Now I'm building a PC and have to extend the power wire to my DVD writer, which consumes about 30 Watt at 12 Volt = 2.5A

 

When I search what size of wiring I need, I get as result 1mm.

 

What am I missing here?

You are likely not missing anything and picked up a result that has taken length into consideration.

 

.5 or .75 multi strand cable will suffice for the short length you require. Most PC power connectors have the shared ground (black) doubled up.

 

11 minutes ago, Fruit Trader said:

You are likely not missing anything and picked up a result that has taken length into consideration.

 

.5 or .75 multi strand cable will suffice for the short length you require. Most PC power connectors have the shared ground (black) doubled up.

 

That is also what I would have thought, but I googled for 30 watt wiring size, and all results were US quotes, claiming 18 AWG was what I needed.v  Some even suggested 16 AWG

 

Here are just 3 results

 

https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

 

https://battlebornbatteries.com/battery-cable-size/

 

https://info.waytekwire.com/wire_sizing

 

12 minutes ago, BenStark said:

That is also what I would have thought, but I googled for 30 watt wiring size, and all results were US quotes, claiming 18 AWG was what I needed.v  Some even suggested 16 AWG

 

Here are just 3 results

 

https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html

 

https://battlebornbatteries.com/battery-cable-size/

 

https://info.waytekwire.com/wire_sizing

 

Google results can make you crazy - look at this one for 18AWG

 

https://portablepowerguides.com/how-many-amps-can-18-gauge-wire-handle/

 

 

If you need to extend your power supply => DVD drive wiring, just buy an extension cable ???? 

 

To be honest, at the current we are talking about <0.5mm² is more than adequate, using bigger is more a matter of mechanical robustness than current carrying capability.