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iirc, the higher voltages are more likely to assume jacobs ladder

http://www.repairfaq.org/sam/jacobs.htm

the article mentions >

A person
named F. Pashchen in 1889 published a law which sets out
what has become known as Paschen's Law. He determined
the relationship between breakdown voltage, the gap
between two metal plates, and the pressure. With air as the
gas, the minimum voltage is 327V, as shown in Fig. 5. The
peak of a 120VAC sine wave is only 170V, and thus
continuous low current arcing is, by a law of physics, not
possible with copper-copper. Thus claims that a
Combination AFCI will respond to arcing at a break in a
conductor or a loose connection flies in the face of a law of
physics.

http://en.wikipedia.org/wiki/Paschen's_law

Anything i could add would be assumption, since this is EE turf

so Scott, please be kind & translate to english k?



and workmanship?

well i'd love that perfect world where licensure, inspections, maintanence issues, and all entities involved could be on the same page

beam me up!



~S~

More reading to peak my interests.

Great subject, this topic.