Thinking that industrial places this
dimmer was designed for are already in a traditional scale of compliance at 20A/12ga
wire to outlets. That's a industry thing that 15A wiring for industrial use is not sufficient since way back. Others more versed in the code would be able to better able to agree on this even if not find what I remember for the exception of 15A plugs used for 20A
power in
stage and studio type use.
In other words, where this
dimmer is designed to
plug into, it is by code assumed that all wiring and overcurrent protection is already rated for it. The use of a 5-15
plug while I also disagree with its use, is however common. Once did some not within code 5-20P to L21-30R adaptors for a show. They were to
plug directly into the back of a AC-Distro rack which didn't have such an output - later upgraded and we don't use such things.
Still the
adaptor got to the job site and even though the rack had 20A outlets on it and such plugs will have plugged directly into it, some
stage hand wasted upteen amount of hours in removing all my commercial grade 5-20 plugs and replacing them with store bought home owner grade 5-15P plugs. Me in being "proper" sent out a
plug type no local
stage hand was familiar with or took the time in a rush to get the show out and re-wire all the plugs so as to familiarize themselves with it or its connection direct to the AC rack.
Dangerous
adaptor to do but breakered at 20A and while if un-plugged and touching a prong one could get shocked, still necessary for the production to do this before I added such an
outlet to the rack. Still though it was a question of me doing a proper 5-15P
plug, and them pro's with at least ten years in the industry using it not having seen it before thus swapping it out. The 5-20 I use where I can but simply enough ain't trained into the end user sufficiently.
Years ago I also switched all our cable from 14/3 to 12/3 for much the same reason - too many professionals on a jobsite not calculating the load even for an
edison cable by way of cable length and draw. Playing with fire those "expert or professional" that would use say a 100' run of say 16/3 to overload with 20A. Nothing will help them even idiot proofing - provide the 5-20P, it will confuse and cause them to remove it. Normal
Edison if commercial grade is fine.