Joke apart, you had a 16amp power suply behind 8amp cabling. So one ore more of these machines drained more than 8amp. You may locate the faultly one up to the last burned cable.
The thing is: that 8x platinum cable is actually 16 amps, since 1x platinum is 2 amps, that's why I've used it. So I have no idea why is that happened.