Two Inch Electrical (53) Conduit Dimensions

Two Inch 2″ is the trade size, not the actual dimension of electrical conduit.  Fifty Three  53 is the metric designator not the actual dimension in millimeters.  The dimensions for various types of 2″ electrical conduits are below.  The information was derived from several sources and should not be considered precise.  Dimensions may vary slightly between manufacturers.

Two Inch Electrical Conduit Dimensions

2″ (53) Electrical Metallic Tubing (EMT or Thinwall) is a smooth lightweight galvanized metal conduit that has an inside diameter of 2.067″ or 52.50mm.  The outside diameter is 2.197″ or 55.8mm.  The wall thickness of 2″ EMT is .065″ or 1.65mm.  100 feet of 2″ EMT weighs approximately 148 pounds or 67.1 kilograms.  It requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) 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,  threads per inch 11.5 NPT.  100′ of 2″ RMC weighs approximately 350 pounds or 158.7 kilograms.  It has an inside diameter of 2.067″ or 52.50mm  It has an outside diameter of 2.375″ or 60.3mm.  The wall thickness is .146″ or 3.70mm.  2″ Rigid requires a 2.5″ hole for the conduit and fittings.  A tap needs a 2 7/32″ hole.

2″ (53) 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 2″ IMC weighs approximately 256 pounds or 116.1 kilograms.  2″ IMC has an inside diameter of 2.170″ or 54.6mm.  It has an outside diameter of 2.36″ or 59.9mm.  The wall thickness is .105″ or 2.67mm.

2″ (53) 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 2″ Reduced Wall Steel Greenfield weighs approximately 133 pounds (60.33  kilograms).  Reduced Wall 2″ Aluminum FMC weighs 40 pounds or 18.14368 kilograms.  2″ FMC has a minimum inside diameter of 2.000″ or 50.8mm and a maximum inside diameter of 2.080″ or 52.832mm.  It has a minimum outside diameter of 2.350″ or 59.69mm and a maximum outside diameter of 2.450″ or 62.23mm.  The minimum bending radius is 12 inches or 304.8mm.  2″ Flex requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) Rigid Polyvinyl Chloride Conduit (PVC) schedule 40 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 2.067″ or 52.5018mm.  It has an outside diameter of 2.375″ or 60.325mm.  The wall thickness is .154″ or 3.9116mm.  2″ Schedule 40 weighs 73 pounds per 100 feet (33.112216 kilograms).  2″ PVC requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) 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.  Schedule 80 has an inside diameter of 1.939″ or 49.2506mm.  It has an outside diameter of 2.375″ or 60.325mm.  The wall thickness is .218″ or 5.5372mm.  2″ Schedule 80 weighs 101 pounds per 100 feet or 45.812792 kilograms.  2″ PVC requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32 ” hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) Electrical Nonmetallic Tubing (ENT or Smurf) is a nonmetallic, non-conductive flexible conduit with an inside diameter of 2.030″ or 51.562mm.  It weighs 32 pounds per 100 feet or 14.514944 kilograms.  2″ ENT has an outside diameter of 2.375″ or 60.325mm.  The minimum bend radius is 9.5 inches or 241.3mm.  2″ fittings requires a 2.5″ hole.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT

2″ (53) Liguidtight Flexible Metal Conduit (LFMC or Sealtight) is a flexible metal conduit with a non-metallic, non-conductive outer jacket that makes it suitable for use in wet locations.  100 feet of 2″ Sealtight weighs 141 pounds or 63.956472 kilograms.  It has an inside minimum diameter of 2.020″ or 51.308mm and a maximum inside diameter of 2.045″ or 51.943mm.  It has a minimum outside diameter of 2.340″ or 59.436mm and a maximum outside diameter of 2.375″ or 60.325mm.  The minimum bending radius is 12 inches (304.8mm).  Fittings requires a 2.5″ hole.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) Liguidtight Flexible Nonmetallic Conduit (LFNC or CarFlex) is a nonmetallic flexible conduit that is suitable for wet conditions.  100′ of 2″ Carflex weighs 70 pounds or 31.75144 kilograms.  It has an inside minimum diameter of 2.020″ or 51.308mm and a maximum inside diameter of 2.045″ or 51.943mm.  It has a minimum outside diameter of 2.340″ or 59.436mm and a maximum outside diameter of 2.375″ or 60.325mm.  The minimum bending radius is 11.1 inches or 281.94mm.  It requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) Reinforced Thermosetting Resin Conduit (RTRC or Fiberglass) is a nonmetallic conduit that is suitable for many conditions.  It has an inside diameter of 2.235″ or 56.769mm.  Outside diameter is 2.375″ or 60.325mm.  The conduit wall thickness is .070″ or 1.778mm.  100 feet of two inch SW RTRC weighs 38 pounds or 17.236496 kilograms.  It requires a 2.5″ hole for the conduit fittings.  A tap needs a 2 7/32″ hole.  Threads per inch for the fittings is 11.5 NPT.

2″ (53) High Density Polyethylene (HDPE) is a non-metallic flexible conduit available in long reel lengths to reduce joints and installation time.  It has an outside diameter of 2.375″ or 60.325mm.  Type SDR-9 has an inside diameter of 1.815″ or 46.101mm.  100 feet of 2″ HDPE weighs 75.9 pounds or 34.4276328 kilograms.  The wall thickness is .264″ or 6.7056mm.

All two inch 2″ (53) conduit and fittings require a two and one half 2.5″ opening into an electrical box.  The hole can be made with a hole saw or a knockout punch.

A tap for two inch 2″ (53) conduit or conduit fittings requires a 2 7/32″ hole.  The threads per inch is 11.5 National Pipe Thread (NPT).

The standard length for most conduits is ten feet 10′ or 3.048 meters.  Twenty foot 20′ (6.096 meters) lengths of metal conduit are available, but not always in stock.  PVC conduit is available in ten foot 10′ and in some sizes, twenty foot 20′ lengths.  RTRC mostly comes in twenty foot 20′ lengths.  The flexible conduits come in various length coils and reels depending on the trade size.  Some electrical supply companies will cut flexible conduit to length.

See my post describing various electrical conduit types.

Other Size Electrical Conduits

1/2″ (16)        3/4″ (21)       1″ (27)

1 1/4″ (35)       1 1/2″ (41)       2 1/2″ (63)

3″ (78)       3 1/2″ (91)       4″ (103)

5″ (129)       6″ (155)

For more conduit code details and conduit fill see Chapter 9, Tables 1, 4, 5 and 5A.
See the tables in Informative Annex C in the back of the National Electrical Code (NFPA 70) for the allowable number of wires in each size conduit.