electrical code Arduino

[Mike O'Dell]

the usual trick is to partition boxes so the 
low voltage stuff and the higher voltage stuff
can't physically get together. for example, 
the lighting system in my house uses low voltage
control signals running to the dimmer packs which
run on mains power. the boxes have the dimmer packs
mounted down the middle with the low voltage terminals
on the left and the mains terminals on the right.
all the terminals strips and such are physically
isolated by a non-conducting "fence" which runs
down each side of the dimmer packs and the two
kinds of circuits exit the packs on opposite sides.

so if one is doing motor control or the like, use
enclosed relays which already provide physical
terminal diversity and isolation and use the ideas
from the above example. the panels described above
meet USNEC requirements. you can, of course, buy
control enclosures which just do this kind of thing,
but if you are home-brewing, it isn't hard. in fact,
it's less demanding thatn the construction techniques
required for building a high-power RF amplifier where
the HV RF will leap across many inches, hop on unsuspecting
wiring runs, and sneak through holes to do evil on
defenseless control circuits.

	    -mo