Ok, looks like pvc with plastic boxes will do, the concern was stories I read about barn fires caused from metal boxes rusted from moisture with changing temperture's and animal waste the acid's speeding up the decay on metals, That would be great if there was a spray coating that could protect the armored cable like a rust proof application.
Now one point I wanted to make was the armored cable if out of reach like the ceiling runs, would that exception be possible? Ok Ok OK the secrect is out. I love armored cable, but I love horses also I want to be the safest first!
