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Recently, there seems to be an issue with the single family home builders. Lack of railings at the staircase landings, lack of railings on the stairs, same for the 'balconies'. And 'temporary' stairs to the basements, and upper levels.

I told my inspectors to not enter, leave a red tag.

Wow, the phone calls. "Provide safe, compliant access, or no inspections."

Problem solved.

That is also called candelabra or miniature. Amazon may have what you need

amazon

They also have the bulbs, I am guessing 12v.
Like a lot of things you can buy a couple dozen for the price of 2. You are paying for the package.
Now that you know what you are looking for Home Depot may have them.

I am familiar with the RCD systems and when NFPA gets done, I think our solution will be better but more expensive. Between the GFCI and AFCI that incorporates GFPE protection, every circuit will be protected.
The main advantage is, when you get a ground fault, the whole house doesn't go black.
That might be an Easter Egg hunt most of us would like to avoid.
In most cases you will be in eyesight of a GFCI you tripped..

Are you referring to table 10.1?

I do sympathize with a resi EC that just wants one code book to refer to, but commercial industrial has really expanded way beyond the NEC.

Allot of what a commercial electrical designer/engineer deals with is now in the energy code anyways;
Lighting, transformer efficiency, voltage drop, motor efficiency..
I have to submit compliance with all that stuff.
Then there is all the life safety egress lighting, stand by systems, and fire alarm codes...
ADA height requirements for electrical..
For a typical retail store design I way have more plan checks in other codes than the NEC.
Even something as simple as a E-stop for a gas station is affected by a different code.

The outlet spacing and design stuff for residential in the NEC 210 dates back to the 1930's when people used extension cords tapped off lighting pendants and it was causing fires thus falls in the 90.2 scope.

Just my 2 cents.