Dedicated power lines-getting started

Receptacle spacing has been in the NEC forever, and is no bigie; in fact it's too conservative. No one would design a modern residence to Code minimum - and remember, the Code is *not a design guide, and most of it's requirements are *minimums.

Ditto Eagle. The wire mentioned is UL and NEC defined as Power Limited Fire Alarm Cable. The prob w/ 300V rated wire intended for power circuits is the abuse and abrasion that may occur on installation. Especially on retrofits. There isn't much margin for error. Hence building wire is all 600V insulation rated... It's thick, it's fat, and intended on getting beat up on installation.

Yeah, you could make up some PC's with this cable that would be OK, but you had better know what you're doing, and don't plan on dragging them around or walking on them...

There is, no subsitute or compromise when it comes to electrical safety.

subaru-
Romex is indeed subject to fork-ups on installation. There are many many cases of a heavy handed gorilla taking one too many whacks with a hammer on those romex staples, crushing the wire, creating either a dead line-to-neutral/ground short, or much worse, an arcing ground fault. Result of the latter: a fire.

Regardless of the conductor chose, note that in the electrical trade, residential wiring is called "dingbat" work, and is where apprentices start out at. No slur intended; they are just following the plans (Code minimum)as approved by the developer (Cost & time minimum), and that's why we all end up with $0.79 receptacles w/ #14 wiring.

There are NEC provisions that are stupid for the informed, but are there to protect the idiots. No, I won't list the ones I know. And that's why any intelligent engineer or designer, or provider of electrical material, won't ever give casual advice unless he is covered by liability insurance.

Your response was well stated, BTW. Personally, I wouldn't be retailing electrical products that aren't listed and labeled for the use I was advertising them as, unless I included a liability release with each purchase order, since you don't personally supervise the installation of said products.