Hi unbent. If the PSU has an input voltage selector (240V / 120V or thereabouts) then it's most important that you get that right. Other than that about the only thing you can get wrong is a short circuit between the motherboard and chassis. Nothing should be able to cause the house circuit to trip. A decent quality PSU should have sufficient protection to prevent that happening. If by "the circuit to the house tripped" you are referring to the RCD leakage protector, then the cause has to be a short circuit (or partial short circuit) between line or neutral and earth. Try a different power cable to see if that is faulty, otherwise it looks like a problem inside the PSU.