Who to refer?

[Robert Meier]

In a case like this would one recommend how to fix it or just defer the fix to someone else? I could see the HVAC guy just changing the type of control conductors and making the same mistake twice.

[Jeffrey R. Pope]

I report that low voltage and high voltage components must be in separate enclosures and/or conduit. I don't reference the conductor types.

[Christopher Currins]

What about telephone cables (at bottom) in conduit with SEC, not what I'm pointing at (mismatched breakers).

[David A. Andersen]

What about them?

Did you have a question about mixing hi/lo voltage conductors?

[Robert Meier]

The real issue here is that many electrician's and HVAC techs think that you can install class 2 conductors and power conductors in the same raceway, they typically will cite (incorrectly) NEC 300.3(C).

300.3(C)(1) 600 Volts, Nominal, or Less. Conductors of ac and dc circuits, rated 600 volts, nominal, or less, shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway.
Exception: For solar photovoltaic systems in accordance with 690.4(B).

FPN: See 725.136(A) for Class 2 and Class 3 circuit conductors.

What they miss is the FPN at the end which directs you to article 725 which prohibits Class 2 conductors in the raceway or enclosure with power conductors. This would mean that Class 2 control conductors, like the ones in the OP, would not be permitted to be installed as shown even if their insulation value was the same as that of the power conductors.

725.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Network-Powered Broadband Communications Cables.
(A) General. Cables and conductors of Class 2 and Class 3 circuits shall not be placed in any cable, cable tray, compartment, enclosure, manhole, outlet box, device box, raceway, or similar fitting with conductors of electric light, power, Class 1, non–power-limited fire alarm circuits, and medium-power network-powered broadband communications circuits unless permitted by 725.136(B) through (I).