In a personal project, I need to power several 5V appliances which, together, use up to 12A.
I want to use a 60 inch cable between a case to which those appliances are connected, and the transformer with 230V AC in and 5V DC max. 30A out.
When I look at the specification for the cables and the connectors, they are all rated pretty low in terms of maximum amperage allowed. For instance, standard C13/C14 connectors used for personal computers are rated 10A.
I suppose that those ratings are likely to be for 250V AC.
Is it safe to simply scale the ratings down to 5V, so 10A for 250V would mean a power of 2500W, and so a maximum of 500A at 5V?
If not, what calculations should I use to determine the required AWG size of the cables and the type of connectors that I am allowed to use?