Hello Brian,

Many thanks for your suggestion, I now realise that I should have split the load.
This won't be for any commercial setup. It is going on my verendah outside.
Sort of a party light RGB led type effect.

So if any clown is going to slice the wire, it will be me(and probably will)....and if the verendah burns down......., - well... that will also be me and if that is the case, I will be running for the hills so that my other half doesn't kill me. (She can be threatening at times)

At this stage I have already etched the PCBs and the best that I can do is split the 18A load in 2 parts which would suit the PSU I have (9Amps to each).

I am using screw terminals, (18Amps spread over 30 screw terminals) all decent size and I made the board with heavy duty tracks.
And your fuse is not a bad idea either. I think I can include that on all screw terminals.
Alu box is also fan assisted (120mm) cooling with lots of heatsinking.

I guess my primary concern was whether it is an acceptable practice to parallel independant power supplies to get more amperage.

Many thanks. Hopefully I can post some success pictures of the project, - and not the verendah burning.