fbpx
Home Tags 3.5″ electrical conduit

Tag: 3.5″ electrical conduit

Three and a Half Inch (91mm) Electrical Conduit Dimensions

Three and a Half Inch 3.5" is the trade size, not the actual dimension of electrical conduit.  Ninety 0ne 91 is the metric designator not the actual dimension in millimeters.  The dimensions for various types of 3.5″ electrical conduits are below.  The information was derived from several sources and should not be considered precise.  Dimensions may vary slightly between manufacturers. Three and One Half Inch Conduit Dimensions 3.5″ (91) Electrical Metallic Tubing (EMT or Thinwall) is a smooth lightweight galvanized metal conduit that has an inside diameter of 3.834" or 97.4mm.  The outside diameter is 4.000" or 101.6mm.  The wall thickness of 3.5″ EMT is .083" or 2.11mm.  100 feet of 3.5" EMT weighs approximately 349 pounds or 158.3 kilograms.  It requires a 4 1/8" hole for the conduit fittings.  A tap needs a 3 3/4" hole.  Threads per inch for the fittings is 8 NPT. 3.5″ (91) Rigid Metal Conduit (RMC) is a heavy weight conduit with a galvanized finish throughout.  It has factory threads with a 3/4″ per foot taper, 8 threads per inch NPT.  100′ of 3.5" RMC weighs approximately 880 pounds or 399.1 kilograms.  It has an inside diameter of 3.548" or 90.12mm and It has an outside diameter of 4.000″ or 101.6mm.  The wall thickness is .215″ or 5.50mm.  3.5" Rigid requires a 4 1/8" hole for the conduit and fittings.  A tap needs a 3 3/4" hole. 3.5″ (91) 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 8 threads per inch NPT.  It also utilizes the same couplings and fittings as RMC.  100 feet of 3.5" IMC weighs approximately 629 pounds or 285.3 kilograms.  3.5" IMC has an inside diameter of 3.671" or 93.2mm.  It has an outside diameter of 3.971″ or 100.7mm.  The wall thickness is .15″ or 3.81mm. 3.5″ (91) Flexible Metal Conduit (FMC or Greenfield) is a galvanized finished flexible metal electrical conduit composed of a continuously formed interlocking metal strip.  100 feet of 3.5" Reduced Wall Steel Greenfield weighs approximately 220 pounds (99.79024 kilograms).  Reduced Wall 3.5" Aluminum FMC weighs 68 pounds or 30.844256 kilograms.  3.5" FMC has a minimum inside diameter of 3.500" or 88.9mm.  It has a minimum outside diameter of 3.860″ or 98.044mm and a maximum outside diameter of 4.060″ or 103.124mm.  The minimum bending radius is 21 inches or 533.4mm.  3.5" Flex requires a 4 1/8" hole for the conduit fittings.  A tap needs a 3 3/4" hole.  Threads per inch for the fittings is 8 NPT. 3.5″ (91) Rigid Polyvinyl Chloride Conduit Schedule 40 (PVC) is a nonmetallic, non-conductive electrical conduit that is good to use indoors and outdoors, or underground.  It has some flexibility with an inside diameter of 3.548″ or 90.12mm.  It has an outside diameter of 4.00″ or 101.60mm.  The wall thickness is .226″ or 5.7404mm.  3.5" Schedule 40 weighs 196 pounds per...