Rigid metal conduit must be provided with expansion fittings if necessary to compensate for thermal expansion and contraction [Sec. 300.7 (B)]. The expansion characteristics for metal raceways are ...

Solution: A 1-in. conduit has a 100% Total Area of .864 sq in. Therefore, .864 sq in. x 60% = .5184 sq in. Since .5184 sq in. is greater than .3724 sq in., a 1-in. EMT nipple is acceptable for use in ...