MC to PVC

[Shockedby277v]

Maybe 310.15(b) (2) Exception #5 How many 2 wire Mc's could I have

After reading it. Is the answer 19??? I give.

 

[tommy]

I would say (10) 12-2 mc wires according to (c).After that the 60% comes into to play and right out of the bat 12 gauge wire is only good for 18 amps so would then have to go to 10 gauge. Also how I figured 310.16 chart for 12 gauge use 90C since thats for thhn 30 amps Also use 90 c for derating because of 110.14(c)

 

[Smart $]

Well since you have made up your mind and everyone is still going on, I may as well put my two cents in. What about placing a junction box on the wall right where the MC exits the ceiling. Then PVC down to the device box

I believe the device box is an embedded masonry box with pvc sections connected up through the cmu cells as the brickies coursed up the wall. Where the pvc exits will not be accessible after the ceiling is installed. Most likely it will be "hardtop".

 

[tommy]

In that case I would strap the MC or nm before entering the pvc and be sure to ground the box.

 

[Shockedby277v]

why not fish the box with the MC ??

 

[tommy]

What code art for not running mc into a raceway