How to connect multiple power rail wires together?
Terminal Strips are most common for pigtail wire bonding but in pairs demands a solid wire to connect up one side of the screw terminals by daisy-chain then to source.
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Busbar connectors tend to be overkill $

 
REF 7 load sides per pole but this one is cheap $2.80

  REF  $2.30 (5)
Mount on FR4, wood or equiv. and bridge all pins together with AWG 16 solid gnd wire.