I question that theory because house wiring uses single strand solid wire. Whatcha think, gurus?
As far as why single strand solid wire is used in house wiring:
- Stranded wire is more expensive to make.
- At a given wire gauge, stranded is going to be larger than solid wire (it's the cross-sectional area of conductor that counts and there are going to be some air gaps between conductors with stranded). This could make a big difference if you have several cables in a limited space like an electrical box.
- The main advantage of stranded is that it's more flexible. You generally don't need this in home wiring because it's all put in place once and hidden behind walls/floors/ceilings.
- When you screw a solid wire into a switch or receptacle, you can tell if it's secure. You cannot see individual strands coming loose as you fold wires back into an electrical box.