There's a good possibility that this "smoke job" was caused by an internal fault in the occupancy sensor.
There's internal circuitry that uses the ground. (as a matter of fact, some of the newer ones come with 2 grounds. 1 to be used for 120V, the other for use @ 277V).
This could account for the massive amount of smoke before/without tripping the c/b.
Good chance that the internal circuitry had to burn before the circuit went directly to ground.
We use the "different" colors of M/C cable where we have 4 wire circuits, but like Bob & Nick, have only used the "brn/gry, yell/gry, etc. a few times due to the logistic nightmare of stocking all the different colors.
Bob, I like the idea of painting the plates, we have just labeled them in the past...I'll give it a try.
[This message has been edited by electure (edited 04-08-2004).]
