flexiapp - find-a-conduit

Try our new smart phone app and find the perfect conduit for your requirements!


thread data and cable carrying capacity

metric
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
PG
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
PF / gas
Japanese conduit thread conforming to JIS B 0202
Thread size External thread outside diameter(mm) Internal thread inside diameter(mm) Pitch
(mm)
½ 21.0 18.6 1.81
¾ 26.4 24.1 1.81
1 33.3 30.3 2.31
1 ¼ 41.9 39.0 2.31
1 ½ 47.8 44.8 2.31
2 59.6 56.7 2.31
UNEF / UNS / UN
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)
24 5/8 15.9 14.7 1.06
20 ¾ 19.1 17.7 1.27
20 7/8 22.2 20.9 1.27
20 1 25.4 24.0 1.27
18 1 3/16 30.2 28.6 1.41
18 1 3/8 34.9 33.4 1.41
18 1 ¼ 31.8 30.2 1.41
18 1 7/16 36.5 35.0 1.41
18 UNS 1 ¾ 44.5 42.9 1.41
18 UNS 2 50.8 49.3 1.41
18 UN 2 ¼ 57.2 55.4 1.41
NPT
American taper pipe thread conforming to ANS/ASME B1.20.1 - 1983

Thread size
(inches)

External thread outside diameter
(mm)
Pitch
mm
3/8 16.7 1.14
½ 21.0 1.81
¾ 26.4 1.81
1 33.3 2.21
1 ¼ 41.9 2.21
1 ½ 47.8 2.21
2
59.6 2.21
cable carrying capacity
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 Nominal overall cross sectional area (mm2)
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]2 = 201mm2
  • % of conduit cross sectional area 73/201 = 36%
  • This is less than 40%; therefore this conduit is suitable for this combination of cables.
    UK wiring regulations

    UK wiring regulations BS7671 prohibit the use of flexible or pliable conduit as an earthing conductor.

    Where conduits of 40mm and above penetrate fire barriers in buildings the wiring regulations stipulate that internal seals should be used to maintain fire resistance.

    To meet the UK wiring regulations conduit should be self extinguishing unless they are to be buried or contained in non combustible material e.g: concrete or plaster.

    Please telephone the Flexicon hotline for further guidance.

    Flexicon © Site by CI
    Flexicon Limited, Roman Way, Birmingham B46 1HG (T) +44 (0) 1675 466900 (F) +44 (0) 1675 466901