On Aug 14, 2:51 pm, David Nebenzahl wrote:

First of all, it is an approved, UL/CSA tested, and, most importantly,
code-approved (US building code) wiring method. If it was as all-fired
bad as folks here claim, why would it still be allowed? After all, the
building codes tend to err on the side of caution.

However, all kinds of unreliable crap is UL listed. A UL listing is a
pretty good indication that something probably won't kill you or burn
down your house, but says nothing at all about whether it will
function properly. Building codes put a little more emphasis on
function, but are also updated fairly regularly because things that
were once required are finally proven to be bad ideas.