A rigid, enclosed conductor run. Where parallel cables would need a trench and a dozen terminations, this is one assembly with one set of joints.

Rating plate
Busduct
Specify a 200% neutral where the load is non-linear. Third-harmonic currents from VFDs, LED drivers and switch-mode supplies do not cancel in the neutral — they add, and a 100% neutral runs hotter than the phases.
Colour coding the plating by incomer is a maintenance decision, not a cosmetic one: an electrician standing in front of an open flange can tell a generator-fed run from a transformer-fed one without a drawing.
IEC 60439-2 is the standard the range was certified to; it has since been replaced by IEC 61439-6. New designs are offered to either on request.
The assembly is ours; the switchgear inside it is genuine, authorised-channel product from the makes you specify.
Built to the same standard, and able to share a lineup with this one.

1000 A · 21 kA/3 s · IP65

PCC · 6300 A · Form 3b/4

MCC · 4000 A · Draw-out

PMCC · Combined
A drawing, a load list or a BOQ is enough to start. You'll get the ratings checked against the actual fault level, a general-arrangement drawing to approve, and a fixed price.