Wiring colors

A quick reference, this is far from authoritative or exhaustive but intended to be used a go-to unless you have better information:

L1
(Hot 1)
(Hot 2) L2 L3 N PE
Europe Single Phase Brown Blue Green / Yellow
Three Phase Brown Black Grey Blue
(if present)
Green / Yellow
USA Single Phase 120 V Black White Green or Bare
Split Phase 120/240 V Black Red White Green or Bare
Three Phase 120/208 V Black Red Blue White
(if present)
Green or Bare

USA Plug configurations – NEMA Plug & Receptacle chart