The use of PVC fire sprinkler (orange) scraps for sleeves thru rated sheetrock walls in multi-family resi was a 'red tag' topic that was discussed at a NJEIA meeting recently.
Debate was that the orange pvc was not approved electrical materials.
BTW: Not my argument. Perhaps 'common sense' can be adopted into the next code cycle; sure looks like a lot of guys in my area have totally lost it
