IMC v. RMC

Another good question popped up on the first year homework check in page, it is:

.										What is the difference with RMC and IMC?

Answer:  Bottom line is that IMC has a thinner wall but the steel is processed in a way that makes it stronger, so IMC is lighter yet just as strong. For example 1" IMC weighs 119 lbs/100' while RMC weighs 161 lbs/100'.  They have the same external dimensions so they thread and bend in the same tools and screw into the same fittings.  The thinner wall gives IMC a larger internal diameter which, coupled with an internal coating not always found in RMC, makes it easier to pull wire through.  The manufacturers say that bending IMC is just the same as rigid.  Your results may vary.