[SOLVED] Can random psu extension cables be dangerous for components?

Solution
It is not a good idea to buy off brand cables like those shown.

If there is some misconnection or faulty connection within the cable or plug a short could occur or the wrong voltage applied to a component .

Risks = smoke, sparks, fire, burned components...

That can happen even with brand cables.

However brand cables are more likely to have more rigid manufacturing requirements, adhere to product standards, and quality assurance measures in place.

There is still some risk but much less overall.
It is not a good idea to buy off brand cables like those shown.

If there is some misconnection or faulty connection within the cable or plug a short could occur or the wrong voltage applied to a component .

Risks = smoke, sparks, fire, burned components...

That can happen even with brand cables.

However brand cables are more likely to have more rigid manufacturing requirements, adhere to product standards, and quality assurance measures in place.

There is still some risk but much less overall.
 
Solution
Watersouprty?

LOL!

18g wire isn't very good for a PCIe or EPS12V cable... never mind an extension. And connector pins can be of varying quality. And I'm sure I don't have to tell you about the impact on voltages due to resistance created by the additional wire length and cheap pins.
 
Why do you think you need extension cables?
Normally the supplied lengths of cables for a psu are adequate.
On occasion, a 8 pin cpu eps socket is a bit distant, and the only good solution is a short extension, but best to avoid even that if you could, even at the expense of a non neat bit of cable management.