Branch Circuit on Sub Feed Circuit Breaker

[KMeni]

I discovered a #12 THHN 120V Circuit feeding a ModHopper Terminated on a one leg of a two pole 200A Circuit Breaker. They terminated both the #12 & 250MCM on the same lug. Is this a NEC Code Violation / what section?

 

[Dennis Alwon]

Don't know what a mod hopper is but you cannot install 2 wires of different sizes under a lug. It would be in the lug listing not the NEC. Also I would guess the tap rule did not apply as the #12 would need protection at 20 amps not 200 amps

 

[infinity]

It doubtful that a lug that would accept a 250 kcmil conductor would also be lasted for a #12 conductor.

110.14 Electrical Connections.
Because of different characteristics of dissimilar metals, devices such as pressure terminal or pressure splicing connectors and soldering lugs shall be identified for the material of the conductor and shall be properly installed and used. Conductors of dissimilar metals shall not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as copper and aluminum, copper and copper-clad aluminum, or aluminum and copper-clad aluminum), unless the device is identified for the purpose and conditions of use. Materials such as solder, fluxes, inhibitors, and compounds, where employed, shall be suitable for the use and shall be of a type that will not adversely affect the conductors, installation, or equipment.
FPN: Many terminations and equipment are marked with a tightening torque.
(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 set-screw 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 10 AWG or smaller conductors.
Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.