How to run 2 PSU at same time||PC-MODDING

It's easy...
the first PSU will run the relay to turn on the second PSU.
but,the second PSU I not recommend for big hardware,(example like Graphics Cards,Harddisk,and another like that.)I recommend the second PSU is for modding hardware only,like fans and lights.
IF THERE ANY BROKE HARDWARE BECAUSE OF THIS,I NOT GUARANTEE!