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Just been to look at a job subing to grain drying firm to help then installing cables, lighting etc. The mains is 3ph in house, across newly tarmac to a small out house were it goes to db, then off to variouse sub dbs. The main swa from house is 16mm 4 core, swa as earth. ( No 300 / 500ma main switch in house.) From here it will run to the main board to the new grain shed. There electrican says put 300ma main switch on db in grain store and make it to tt, (as they havent priced to altet anything) But I thought it should be a source. So I proposed making main swa in to tt system / eart rod / 300 ma, then all of farm protected and wont trip the current farm house. Ah this is a arable farm, no livestock ever present, am I right or totally wrong and should keep my thoughts to my self
 
16mm 4 core is actually 49mm not 50mm, but the 50mm is as near as dam it!! lol!!


Table for 90[SUP]0[/SUP]C Thermosetting SWA cables operating at 70[SUP]0[/SUP]C.

Conductor CSA
Minimum CSA of SWA to meet 54G
CSA of armour 2 core
CSA of armour 3 core
CSA of armour 4 core
1.5
3.4
16
17
18
2.5
5.7
17
19
20
4
9.0
19
21
23
6
13.6
22
23
36
10
22.6
26
39
43
16
36.1
41
44
49
25
36.1
42
62
70
35
36.1
62
70
80
50
56.4
68
78
90
70
79.0
80
90
131
95
107.2
113
128
147
120
135.3
(125)
141
206
150
169.2
(138)
201
230
185
208.6
(191)
220
255
240
270.6
(215)
(250)
289
300
338.3
(235)
(269)
(319)
400
451.0
(265)
(304)
452
 
Here you go Glenn....

Blue = min CSA of cables SWA to comply.

(Red) = Cable does not comply.

Table for 70[SUP]0[/SUP]C Thermoplastic PVC SWA cables.


Conductor CSA

Minimum CSA of SWA to meet 54G

CSA of armour 2 core

CSA of armour 3 core

CSA of armour 4 core

1.5

3.4

15

16

17

2.5

5.7

17

19

20

4

9.0

21

23

35

6

13.6

24

36

40

10

22.6

41

44

49

16

36.1

46

50

72

25

36.1

60

66

76

35

36.1

66

74

84

50

56.4

74

84

122

70

79.0

84

119

138

95

107.2

122

138

160

120

135.3

(131)

150

220

150

169.2

(144)

211

240

185

208.6

(201)

230

265

240

270.6

(225)

(260)

299

300

338.3

(250)

(289)

(333)

400

403.9

(279)

(319)

467



Table for 90[SUP]0[/SUP]C Thermosetting SWA cables operating at 70[SUP]0[/SUP]C.


Conductor CSA

Minimum CSA of SWA to meet 54G

CSA of armour 2 core

CSA of armour 3 core

CSA of armour 4 core

1.5

3.4

16

17

18

2.5

5.7

17

19

20

4

9.0

19

21

23

6

13.6

22

23

36

10

22.6

26

39

43

16

36.1

41

44

49

25

36.1

42

62

70

35

36.1

62

70

80

50

56.4

68

78

90

70

79.0

80

90

131

95

107.2

113

128

147

120

135.3

(125)

141

206

150

169.2

(138)

201

230

185

208.6

(191)

220

255

240

270.6

(215)

(250)

289

300

338.3

(235)

(269)

(319)

400

451.0

(265)

(304)

452



For CPC purposes ''ONLY''. Do not use where BONDING is also a requirement....
 
Here you go Glenn....

Blue = min CSA of cables SWA to comply.

(Red) = Cable does not comply.

Table for 70[SUP]0[/SUP]C Thermoplastic PVC SWA cables.


Conductor CSA

Minimum CSA of SWA to meet 54G

CSA of armour 2 core

CSA of armour 3 core

CSA of armour 4 core

1.5

3.4

15

16

17

2.5

5.7

17

19

20

4

9.0

21

23

35

6

13.6

24

36

40

10

22.6

41

44

49

16

36.1

46

50

72

25

36.1

60

66

76

35

36.1

66

74

84

50

56.4

74

84

122

70

79.0

84

119

138

95

107.2

122

138

160

120

135.3

(131)

150

220

150

169.2

(144)

211

240

185

208.6

(201)

230

265

240

270.6

(225)

(260)

299

300

338.3

(250)

(289)

(333)

400

403.9

(279)

(319)

467



Table for 90[SUP]0[/SUP]C Thermosetting SWA cables operating at 70[SUP]0[/SUP]C.


Conductor CSA

Minimum CSA of SWA to meet 54G

CSA of armour 2 core

CSA of armour 3 core

CSA of armour 4 core

1.5

3.4

16

17

18

2.5

5.7

17

19

20

4

9.0

19

21

23

6

13.6

22

23

36

10

22.6

26

39

43

16

36.1

41

44

49

25

36.1

42

62

70

35

36.1

62

70

80

50

56.4

68

78

90

70

79.0

80

90

131

95

107.2

113

128

147

120

135.3

(125)

141

206

150

169.2

(138)

201

230

185

208.6

(191)

220

255

240

270.6

(215)

(250)

289

300

338.3

(235)

(269)

(319)

400

451.0

(265)

(304)

452





Ta..

here...:

have your self a likes n thanks...
:D
 
Right - at the risk of an amount of ridicule, I'm now confused. I'm either had too many ciders in the sunshine or am just not reading those tables right: We've got 16mm conductors, which means we need a cpc of 1/2 16 = 8mm. We've got TN-S so we need to satisfy 544.1 and therefore need to be somewhere between 6mm and 25mm for a bonding conductor. That table says we've got a csa eq of 49mm, yes? So where's the problem?!
 
Right - at the risk of an amount of ridicule, I'm now confused. I'm either had too many ciders in the sunshine or am just not reading those tables right: We've got 16mm conductors, which means we need a cpc of 1/2 16 = 8mm. We've got TN-S so we need to satisfy 544.1 and therefore need to be somewhere between 6mm and 25mm for a bonding conductor. That table says we've got a csa eq of 49mm, yes? So where's the problem?!

There ain't one. The old boys got muggled up. The armouring of a 16mm2 4 core is sufficient as a cpc and bonding conductor but I always run a separate conductor as don't like to have to rely on a gland. (however by regulations you would be fine not to run a separate conductor- testing permitted and satisfactory results obtained obviously)
 
Right - at the risk of an amount of ridicule, I'm now confused. I'm either had too many ciders in the sunshine or am just not reading those tables right: We've got 16mm conductors, which means we need a cpc of 1/2 16 = 8mm. We've got TN-S so we need to satisfy 544.1 and therefore need to be somewhere between 6mm and 25mm for a bonding conductor. That table says we've got a csa eq of 49mm, yes? So where's the problem?!

The problem is if there is extraneous conductive parts in the grain shed . Then it requires to be the copper equivalent. So steel 8/1

[ElectriciansForums.net] agricultural tt earth
 
The problem is if there is extraneous conductive parts in the grain shed . Then it requires to be the copper equivalent. So steel 8/1

View attachment 24726

That's what I mean about not being clear on exactly WHICH csa is being used in the tables - because if some of them don't comply then that suggests they have already been converted steel > copper. And if we've got STEEL at 49, then we've only got a Cu eq of 6mm (which goes back to my original remark about using the adiabatic to see if it complies as earthing conductor or not).
 
The problem is if there is extraneous conductive parts in the grain shed . Then it requires to be the copper equivalent. So steel 8/1

View attachment 24726

That's what I mean about not being clear on exactly WHICH csa is being used in the tables - because if some of them don't comply then that suggests they have already been converted steel > copper. And if we've got STEEL at 49, then we've only got a Cu eq of 6mm (which goes back to my original remark about using the adiabatic to see if it complies as earthing conductor or not).

They are converted values!
 

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