What violation (if any) would this be? The unit is still grounded through the concentric knock out.
Was the “ground wire” a part of the manufactured unit? If yes, why did the manufacturer include the “ground wire”? Did the installation instructions say… “Go ahead and cut off the “ground wire”, you don’t really need it, we just like to waste money and pretend like we care about your safety”. (No, I don’t care that it’s low voltage). :roll:
Correct, part of the unit. But Im guessing the ground wire was included just in case the unit goes into a plastic box KO?
Do you only connect the equipment ground to a receptacle if it’s in a plastic box?
Sorry I do not guess on what should be done .
The ground needs to be hooked up when supplied .
Thank you for the input 
I would guess that the transformer set screw in the KO is listed for grounding therefore the wire type EGC does not need to be connected. You would need to check how the transformer was listed to see if the green conductor is required to be used.
Many Class2 transformers designed for metal enclosures and cover don’t even come with a wire type EGC.
Not an electrician, but haven’t seen a ground wire on a 24 volt transformer yet.
I’ve never seen an instruction manual that said cut off and discard the ground wire.
I guess we would have to see the manual to know for sure. In the absence of an affirmative statement that it’s OK to alter the device in such a manner, I would take the more conservative route and comment that the ground conductor was removed.
I would look at this like any other device that has a provision for grounding, for example a dimmer switch can be grounded via the two 6-32 screws attached to a metal box. Even if the dimmer comes equipped with an integral grounding tail you wouldn’t need to use it.
But doesn’t the device (dimmer in this case) need to be listed as “self grounding”
Receptacles are required to be self-grounding without a bonding jumper switches are not, the two mounting screws are sufficient. I would consider a dimmer switch the same as a switch.
Not in Canada wire from Box to receptacle required in all cases .
It’s not an issue I would lose sleep over
Thank you for your help, as with everyone who posted here. Excellent information 