(a) Terminals. Connection of conductors to terminal parts shall
ensure a thoroughly good connection without damaging the conductors
and shall be made by means of pressure connectors (including setscrew
type), solder lugs, or splices to flexible leads. Connection by
means of wire-binding screws or studs and nuts that have upturned
lugs or the equivalent shall be permitted for 5.5 mm2 (2.6 mm dia.) or
smaller conductors.
Terminals for more than one conductor and terminals used to
connect aluminum shall be so identified.