So I've been designing a wiring harness PCB for my 3D printer to provide connections and easily swappable tools. I settled on a TE 34-pin connector to use as input on the PCB. The current design includes everything I need for any of my tools except the heater cartridge for the hotend. Everything is running over 20awg stranded copper wire.
My concern for the heater cartridge was that, despite 20awg being able to carry the <2A load, the fact that the heater cartridge relies on resistance in the cartridge to heat up, I wasn't sure how that would equate to usability of the 20awg and requirements for my PCB traces (if there's any change at all given the amperage for any other use).
So, my questions are:
- Should I pair 2x 20awg wires for each of the nominal leads of the heater cartridge, or would a single wire on each side work fine?
- Given that the use end of the circuit is designed for high resistance, will the PCB traces need to be wider for any reason? Would the connectors on the PCB need additional thermal relief at all?