I'm curious now, why the 4 core on the actual hub?
who is suggesting that? ...I suggest you use rj45 connectors on cat5 wire to connect to the hub... at the SSC, replace the rj45 connector with 4-core waterproof connectors. you need the twisted pair. and since the hub should be protected from the elements, it is fine to continue with rj45 connectors.
It was me and unless your hubs are inside the house, they are still subject to the outside weather conditions including high humidity and temp changes that can cause condensation in the connectors. At the speed that we send data, I'm not sure how much we really NEED the twisted pair, or at least not at the cat5 level. I will do plenty of testing, subjecting the wire types I am looking at to various types and levels of interference to see what works and what doesn't before I make any commitments.
My experience on the *very* wet west coast is that RJ45 connectors well protected from direct rain or spray, for example under an eve, do just fine. My hubs are inside the recommended marine battery boxes, with the power supply fan moving the air regularly, I have not seen any condensation and zero tarnishing of the copper in the sockets. Connectors carrying DMX, PIXELNET & audio have shown little corrosion exposed to the elements as long as they were oriented to keep the rain out of the socket.
However, ALL connectors from the hubs to the SCCs that were exposed to rain, even those wrapped with electrical tape, corroded amazingly quickly and had to be replaced with waterproof connectors - the high current & seems to suck the moisture out of the air and eat the metal away.