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Dear Mr. Electrician: What are the dimensions of 1 1/2" electrical conduit? Answer: One Inch and One Half (1 1/2″) is the trade size, not the actual dimension of electrical conduit. Forty One (41) is the metric designator not the actual dimension in millimeters. The dimensions for various types of 1 1/2″ electrical conduits are below. The information was derived from several sources and should not be considered precise. Dimensions may vary slightly between manufacturers. NOTE: Text links below go to applicable products on Amazon.com One Inch & One Half Conduit Dimensions 1 1/2″ (41) Electrical Metallic Tubing (EMT or Thinwall) is a smooth lightweight galvanized metal conduit that has an inside diameter of 1.610" or 40.89mm. The outside diameter is 1.740" or 44.2mm. The wall thickness of 1 1/2″ EMT is .065" or 1.65mm. 100 feet of 1 1/2" EMT weighs approximately 116 pounds or 52.6 kilograms. It requires a 2" hole for the conduit fittings. A tap needs a 1 3/4" hole. Threads per inch for the fittings is 11.5 NPT. 1 1/2″ (41) Rigid Metal Conduit (RMC or Rigid) is a heavy weight conduit with a galvanized finish throughout. It has factory threads with a 3/4″ per foot taper, 11.5 threads per inch NPT. 100′ of RMC weighs approximately 263 pounds or 119.3 kilograms. It has an inside diameter of 1.610" or 40.89mm It has an outside diameter of 1.900″ or 48.3mm. The wall thickness is .138″ or 3.50mm. 1 1/2" Rigid requires a 2" hole for the conduit and fittings. A tap needs a 1 3/4" hole. 1 1/2″ (41) Intermediate Metal Conduit (IMC) is a lighter weight version of RMC. It has a galvanized finish inside and out and can be used in many of the same environments as RMC. It has factory threads with a 3/4″ per foot taper, and 11.5 threads per inch NPT. It also utilizes the same couplings and fittings as RMC. 100 feet of 1 1/2" IMC weighs approximately 194 pounds or 88 kilograms. 1 1/2" IMC has an inside diameter of 1.703" or 42.7mm. It has an outside diameter of 1.883″ or 47.8mm. The wall thickness is .1″ or 2.54mm. 1 1/2″ (41) Flexible Metal Conduit (FMC or Greenfield, Flex) is a galvanized finished flexible metal electrical conduit composed of a continuously formed interlocking metal strip. 100 feet of 1 1/2" Reduced Wall Steel Greenfield weighs approximately 78 pounds (35.38 kilograms). Reduced Wall 1 1/2" Aluminum FMC weighs 31 pounds or 14.06 kilograms. 1 1/2" FMC has a minimum inside diameter of 1.500" or 38.1mm and a maximum inside diameter of 1.575″ or 40.005mm. It has a minimum outside diameter of 1.850″ or 46.99mm and a maximum outside diameter of 1.950″ or 49.53mm. The minimum bending radius is 10 inches or 254mm. 1 1/2" Flex requires a 2" hole for the conduit fittings. A tap needs a 1 3/4" hole. Threads per inch for the fittings is 11.5 NPT. 1 1/2″ (41) Rigid Polyvinyl Chloride Conduit (PVC) schedule 40 is a nonmetallic, non-conductive electrical conduit that...