I have to raise a ten foot 2-1/2 IMC riser about three feet. Building is going from a flat roof to a trussed one. Can I use a 3 foot piece of PVC between the meter base and the 10 foot IMC without bonding issues
I know around here you can't use anything for mast except steel RMC. Even though it isn't part of the immediate load bearing portion of the service entrance, I'd think it would still be subject to torsion from wind, etc, and I'd use IMC like the original section.
Check with your AHJ, but they'll probably insist on the use of IMC.