That's one of the most important things in mining rigs that I see a lot of people don't care about and regret it later.
PSUs is the MOST important thing in the whole process. It's what powers up the whole thing and it's gonna working all the time so people should take it more seriously and anything lower than gold is a no no.

Here is a friend of mine who didn't listen to me when I warned him several times that he should get a better one.
The cables were of such a poor quality that they started melting before the whole thing blew up.



Believe me it hurts a lot seeing your money just gone.

Anyway thank god no kids or anyone was around when this happened. But it's a lesson to learn. Don't play with electricity ever.