Dear Mr. Electrician: What are two-inch electrical conduit dimensions?
Answer: Two-inch electrical conduit dimensions for various types of two-inch electrical conduits are below. Two Inch (2″) is the trade size, not the actual dimension of the electrical conduit. Fifty-Three (53) is the metric designator, not the exact dimension in millimeters.
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The information was derived from several sources and should not be considered precise. Dimensions may vary slightly between manufacturers.
Table of Contents:
- EMT
- Rigid Metal Conduit
- Intermediate Metal Conduit
- Flexible Metal Conduit
- Sealtight
- PVC 40
- PVC 80
- Smurf
- LFNC
- Fiberglass
- HDPE
- Other Conduit Sizes
- Links
For details about various electrical conduits with electrical code references, visit my Electrical Conduit Types article here.
METAL ELECTRICAL CONDUIT
2″ Electrical Metallic Tubing (EMT or Thinwall) is a smooth, lightweight galvanized metal conduit with 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. The conduit fittings require a 2.5″ hole. A tap needs a 2 7/32″ hole. Threads per inch for the fittings is 11.5 NPT.
2″ 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.
Two-inch RMC 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″ 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″ 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″ Liquidtight 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.
Two-inch Sealtight 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 require a 2.5″ hole. A tap needs a 2 7/32″ hole. Threads per inch for the fittings is 11.5 NPT.
NON-METALLIC ELECTRICAL CONDUIT
2″ Rigid Polyvinyl Chloride Conduit (PVC) schedule 40 is a nonmetallic, non-conductive electrical conduit that is good to use indoors, 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″ Rigid Polyvinyl Chloride Conduit (PVC) schedule 80 is a nonmetallic, non-conductive electrical conduit that is good to use indoors, outdoors, or underground. It has limited flexibility. Schedule 80 has an inside diameter of 1.939″ or 49.2506mm.
Two-inch PVC 80 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″ 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 require a 2.5″ hole. A tap needs a 2 7/32″ hole. Threads per inch for the fittings is 11.5 NPT
2″ Liquidtight Flexible Nonmetallic Conduit (LFNC or CarFlex) is a nonmetallic flexible conduit suitable for wet conditions. 100′ of 2″ Carflex weighs 70 pounds or 31.75144 kilograms.
Two-inch LFNC 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. The conduit fittings require a 2.5″ hole. A tap needs a 2 7/32″ hole. Threads per inch for the fittings is 11.5 NPT.
2″ Reinforced Thermosetting Resin Conduit (RTRC or Fiberglass) is a nonmetallic conduit suitable for many conditions. It has an inside diameter of 2.235″ or 56.769mm. The outside diameter is 2.375″ or 60.325mm. The conduit wall thickness is .070″ or 1.778mm.
One hundred feet of two-inch SW RTRC weighs 38 pounds or 17.236496 kilograms. The conduit fittings require a 2.5″ hole. A tap needs a 2 7/32″ hole. Threads per inch for the fittings is 11.5 NPT.
2″ 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.
Two-inch HDPE 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″ 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 coils and reels of various lengths depending on the trade size. Some electrical supply companies will cut the flexible conduits to length.
See my post describing various electrical conduit types.
OTHER ELECTRICAL CONDUIT DIMENSIONS
1 1/4″ (35) 1 1/2″ (41) 2 1/2″ (63)
For more conduit code details and conduit fill, see Chapter 9, Tables 1, 4, 5, and 5A.
See the tables in Informative Annex C at the back of the National Electrical Code (NFPA 70) for the allowable number of wires in each size conduit.
My post about hole saw sizes for all electrical conduits might be helpful.
ELECTRICAL CONDUIT MANUFACTURERS
Aluminum and Steel Conduit Products – https://www.westerntube.com/
Fiberglass Conduit Products – https://championfiberglass.com/
PVC Conduit products – https://www.cantexinc.com/
Steel Conduit Products – https://www.alliedeg.us/
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