Allied Tube & Conduit 134 atkore.com/flexicon Flexicon German standard thread conforming to DIN40430 Thread size External thread outside diameter (mm) Internal thread inside diameter (mm) Pitch mm PG7 12.5 11.3 1.27 PG9 15.2 13.9 1.41 PG11 18.6 17.3 1.41 PG13.5 20.4 19.1 1.41 PG16 22.5 21.2 1.41 PG21 28.3 26.8 1.59 PG29 37.0 35.5 1.59 PG36 47.0 45.5 1.59 PG42 54.0 52.5 1.59 PG48 59.3 57.8 1.59 PG American taper pipe thread conforming to ANS/ASME B1.20.1 - 1983 Thread size (inches) External thread max outside diameter (mm) Pitch mm 3⁄8" 17.4 1.14 1⁄2" 21.5 1.81 3⁄4" 27.0 1.81 1" 33.6 2.21 11⁄4" 42.3 2.21 11⁄2" 48.5 2.21 2" 60.6 2.21 NPT Japanese conduit thread conforming to JIS B 0202 Thread size (inches) External thread outside diameter (mm) Internal thread inside diameter (mm) Pitch mm 1⁄2" 21.0 18.6 1.81 3⁄4" 26.4 24.1 1.81 1" 33.3 30.3 2.31 11⁄4" 41.9 39.0 2.31 11⁄2" 47.8 44.8 2.31 2" 59.6 56.7 2.31 PF / gas Standard thread conforming to EN60423 Thread size External thread outside diameter (mm) Internal thread inside diameter (mm) Pitch mm M12 12.0 10.4 1.5 M16 16.0 14.4 1.5 M20 20.0 18.4 1.5 M25 25.0 23.4 1.5 M32 32.0 30.4 1.5 M40 40.0 38.4 1.5 M50 50.0 48.4 1.5 M63 63.0 61.4 1.5 M75 75.0 73.4 1.5 M85 85.0 Metric American unified thread conforming to BS1580 used on circular connectors UNEF Imperial sizes Thread size (inches) External thread outside diameter (mm) Internal thread inside diameter (mm) Pitch mm 5⁄8" - 24 UNEF 5⁄8" 15.9 14.7 1.06 3⁄4" - 20 UNEF 3⁄4" 19.1 17.7 1.27 7⁄8" - 20 UNEF 7⁄8" 22.2 20.9 1.27 1" - 20 UNEF 1" 25.4 24.0 1.27 13⁄16" - 18 UNEF 13⁄16" 30.2 28.6 1.41 11⁄4" - 18 UNEF 11⁄4" 31.8 30.2 1.41 13⁄8" - 18 UNEF 13⁄8" 34.9 33.4 1.41 17⁄16" - 18 UNEF 17⁄16" 36.5 35.0 1.41 13⁄4" - 18 UNS 13⁄4" 44.5 42.9 1.41 2" - 18 UNS 2" 50.8 49.3 1.41 21⁄4" - 18 UN 21⁄4" 57.2 55.4 1.41 UNEF / UNS / UN UK wiring regulations BS7671, recommend that the total cross sectional area of the sum of the individual cables should not exceed 40% of the cross sectional area of the conduit. The nominal cross sectional area of single-core, stranded, PVC insulated cables is provided as a guide only. Other cables may have different dimensions. Nominal conductor size (mm2) Nominal overall cross sectional area (mm2) of cable 1.0 6.6 1.5 7.6 2.5 9.6 4.0 14.5 6.0 18.8 10.0 29.3 16.0 40.2 25.0 63.8 35.0 83.5 50.0 113.0 70.0 149.0 95.0 204.0 Example: is LTP20 suitable for five 4.0mm2 cables? • The total cross sectional area of the conductors is 5 x 14.5mm2 = 73mm2 • The cross sectional area of LTP20 is 3.142 x [ inside diameter ]2 = 201mm2 2 • % of conduit cross sectional area 73 = 36% 201 This is less than 40%; therefore this conduit is suitable for this combination of cables. Cable carrying capacity Technical Data Thread Data and Cable Carrying Capacity
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