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Five inch and four inch PVC electrical conduit emerging from the ground. Conduits are attached to a wood utility company power pole and are for the electrical and telephone service for a building

Five Inch Electrical Conduit Dimensions

Dear Mr. Electrician:  What are the five inch electrical conduit dimensions? Answer:  Five Inch (5″) is the trade size, not the actual dimension of electrical conduit.  One hundred twenty nine (129) is the metric designator not the actual dimension in millimeters. The dimensions for various types of five inch electrical conduits are below.  The information was derived from several sources and should not be considered precise.  Dimensions may vary slightly between manufacturers. Use a 5 1/2″ (140mm) hole saw for five inch conduit fittings. Click here for my post with more detailed descriptions of various types of electrical conduit and their code references, without dimensions. FIVE INCH ELECTRICAL CONDUIT DIMENSIONS 5″ 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 5" RMC weighs approximately 1400 pounds or 634.9 kilograms. Five inch RMC has an inside diameter of 5.073" or 128.85mm.  It has an outside diameter of 5.563″ or 141.30mm.  The wall thickness is .245″ or 6.20mm.  5" Rigid requires a 5 1/2" hole for the conduit and fittings.  A tap needs a 5 9/32" (5.2813") hole for taper pipe threads. 5″ Rigid Polyvinyl Chloride Conduit (PVC) schedule 40 is a nonmetallic, non-conductive electrical conduit that is good to use indoors and outdoors, or underground. Five inch PVC 40 has some flexibility with an inside diameter of 5.047″ or 128.1938mm.  It has an outside diameter of 5.563″ or 141.3002mm.  The wall thickness is .258" or 6.5532mm.  5" Schedule 40 weighs 315 pounds per 100 feet (142.88148 kilograms).  5" PVC requires a 5 1/2" hole for the conduit fittings.  A tap needs a 5 9/32" (5.2813") hole.  Threads per inch for the fittings is 8 NPT. 5″ Rigid Polyvinyl Chloride Conduit (PVC) schedule 80 is a nonmetallic, non-conductive electrical conduit that is good to use indoors and outdoors, or underground.  It has limited flexibility. Five Inch Schedule 80 PVC has an inside diameter of 4.813″ or 122.2502mm.  It has an outside diameter of 5.563″ or 141.3002mm.  The wall thickness is .375″ or 9.525mm.  5" Schedule 80 weighs 428 pounds per 100 feet or 194.137376 kilograms.  5" PVC requires a 5 1/2" hole for the conduit fittings.  A tap needs a 5 9/32" (5.2813") hole.  Threads per inch for the fittings is 8 NPT. 5″ Reinforced Thermosetting Resin Conduit (RTRC or Fiberglass) is a nonmetallic conduit that is suitable for many conditions. Five inch RTRC Fiberglass has an inside diameter of 5.380" or 136.652mm.  Outside diameter is 5.572" or 141.5288mm.  The conduit wall thickness is .096" or 2.4384mm.  100 feet of five inch MW RTRC weighs 120 pounds or 54.43104 kilograms.  It requires a 5 1/2" hole for the conduit fittings.  A tap needs a 5 9/32" (5.2813") hole.  Threads per inch for the fittings is 8 NPT. 5″ High Density Polyethylene (HDPE) is a non-metallic flexible conduit available in long reel lengths to reduce joints and installation time. Five inch HDPE has an outside diameter of 5.563" or 141.3002mm.  Type SDR-9 has an inside diameter of 4.253"...