Is it a good practice to double crimp wires in cheap connectors to daisy chain? I’m brainstorming a simple 4-wires cabling architecture that will carry both power (5V) and data for a small CAN network, overall length would not be more than 2m. I think UTP cables are OK. I don’t like having two headers on the PCB for daisy chaining as disconnecting one node would break the whole bus. Perhaps a hub like those used in I2C could be useful. Anyone with experience or ideas/connectors in bus wiring for small industrial application?
If it meets the size range for the terminal, it's fine.
Doubling up wire, roughly speaking, is worth -3 AWG, so a 22-24AWG crimp should use 2 x 26AWG for instance. A 20-24 crimp could use 24 and 2 x 24 (~= 21) safely.
Also if you're just doing a few-offs, finer wire can arguably be used with oversized crimps (like 26 or 28 in a 22-24 crimp), if you fold over the end, or secure it with solder. The insulation grip / strain relief part obviously won't work so well, mind; it can be tightened up with pliers.
Tim