Is It Mandatory to Separate 230V AC and 24V DC Control Wiring in a VFD Panel According to IEC Standards?

Welcome to the forums, Dee.

One of the more code-knowledgeable members here will likely answer your query . . .

Or not . . .

IEC requires separate runs for certain voltage breakpoints. However, everything I've been able to track down (which isn't all; there is, by a long shot) has no real hard stance on anything below 1000 V. However, knowing what we do *now, vs back in the early 1970s) about how harmonic content and magnetic fields can affect both power and control circuitry, it makes a lot of common sense to have some form of separation or shielding.

If you are AT ALL worried that the data signal might be corrupted by transient effects from the power signal, include the physical separation or shielding.