Are non-residential electrical questions on topic here? For example, this question, which asks about wiring a showcase light. There are special codes that deal with this type of wiring, which would not be familiar to DIYers that do primarily residential electrical work.
In the past, we've considered commercial questions off topic, but allowing them if they were relevant to residential uses. I feel this is a good approach going forward since there's a limited pool of talent on the site that would know answers to commercial questions, and people asking these questions should really be hiring a professional as a cost of doing business.
Regarding the specific question being linked to above, I suspect an answer that doesn't get into commercial code requirements would help the OP and others in a residential environment equally. The standard "check your local codes" disclaimer would cover any concern of the OP doing work that may require a licensed electrician. So I lean towards leaving it open.