Paralleled conductors within each phase, neutral or ground circuit have always had to match, and still do.
(Paralleled conductors within each phase, neutral or ground circuit; to match; ) (Paralleled conductors within each phase, neutral or ground circuit; do; T:still)
Paralleled conductors within each phase, neutral or ground circuit Paralleled conductors within each phase, neutral or ground circuit
to match do
T:still