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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

 

metrisch

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

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.

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