Power shower:
Cable requirements  and restrictions:

essentials

 

An 8.5 or 9.5kw shower requires 10mm2 twin and earth cable if the cable run to the consumer unit is more than 15 metres. 8.5kw showers can use 6mm2  cable on runs less than 15m.  The shower must be permanently connected to the electricity supply via a double pole isolating switch.  A suitably sized MCB - 40 to 45amps - should be fitted at the consumer unit.

Electric Cooker:
Cable requirements and restrictions:

essentials

 

An ordinary domestic oven and hob of 5-8kw will require 6mm2 twin and earth cable on runs of 15m or less. Longer cable runs and larger range-style ovens, double ovens etc may require 10mm2 cable. A suitably sized MCB  - 32 to 45amps - should be fitted at the consumer unit. A switched wall plate must be fitted within 2m of the appliance.

Garage Supply:
Cable requirements and
restrictions:

essentials

 

 

Buried armoured cable is the usual solution to taking a spur to garages and outbuildings.  Cable size is determined by loading and cable length. A 25 metre cable capable of supplying 30 amps must be at least 6mm2, buried 50 cm deep, with warning tape buried at least 15cm above it.

 

Current carrying capacity and associated voltage drop for twin and multicore armoured XLPE insulated cables

Northern and Central cables: 6941X, 6942X, 6943X, 6944X and variants

Conductor

Reference Method 1 (Clipped direct)

Reference Method 11 (Free air)

Cross Sectional Area

1 two-core cable, single phase, ac or dc.

1 three or four core cable, three phase a.c.

1 two-core cable, single phase a.c. or d.c.

1 three or four core cable, three phase a.c.

 

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

mm2

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

 

 

 

 

 

 

 

 

 

1.5

27

31

23

27

29

31

25

27

2.5

36

19

31

16

39

19

33

16

4

49

12

42

10

52

12

44

10

6

62

7.9

53

6.8

66

7.9

56

6.8

10

85

4.7

73

4

90

4.7

78

4

16

110

2.9

94

2.5

115

2.9

99

2.5

 

 

a.c         d.c

 

 

 

a.c         d.c

 

 

25

146

1.90         1.85

124

1.65

152

1.90         1.85

131

1.65

35

180

1.35        1.35

154

1.15

188

1.35         1.35

162

1.15

50

219

1.00         .98

187

0.87

228

1.00         .98

197

0.87

 

Current carrying capacity and associated voltage drop for twin and multicore PVC insulated cables, non-armoured

Northern and Central cables:  6242Y, 6243Y and variants

Conductor

Reference Method 3 (Enclosed)

Reference Method 1 (Clipped Direct)

Reference Method 11 (Free Air)

Cross Sectional Area

1 two-core cable, with or without protective conductor, single phase, ac or dc.

1 three or four-core cable, with or without protective conductor, three phase a.c.

1 two-core cable, with or without protective conductor, single phase, ac or dc.

1 three or four-core cable, with or without protective conductor, three phase a.c.

1 two-core cable, with or without protective conductor, single phase, ac or dc.

1 three or four-core cable, with or without protective conductor, three phase a.c.

 

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

mm2

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

13

44

11.5

38

15

44

13.5

38

17

44

14.5

38

1.5

16.5

29

15

25

19.5

29

17.5

25

22

29

18.5

25

2.5

23

18

20

15

27

18

24

15

30

18

25

15

4

30

11

27

9.5

36

11

32

9.5

40

11

34

9.5

6

38

7.3

34

6.4

46

7.3

41

6.4

51

7.3

43

6.4

10

52

4.4

46

3.8

63

4.4

57

3.8

70

4.4

60

3.8

16

69

2.8

62

2.4

85

2.8

76

2.4

94

2.8

80

2.4

 

Current carrying capacity and associated voltage drop for single core PVC insulated cables, non-armoured, with or without sheath

Northern and Central cables: 64911 and variants

Conductor

Reference Method 3 (Enclosed)

Reference Method 1 (Clipped Direct)

Reference Method 11 (Free Air)

Cross Section

2 cables, single phase a.c. or d.c.

3 or 4 cables, three phase a.c.

2 cables, single phase a.c. or d.c.

3 or 4 cables, three phase a.c.

Horizontal or vertical flat spaced (2 cables, single phase or 3 cables three phases a.c.)

Trefoil (3 cables three phase a.c.)

 

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current capacity

Voltage drop

Current
capacity

Voltage drop
mVA-1m-1

Current capacity

Voltage drop

mm2

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

mVA-1m-1

A

Single phase

d.c.

Three phase

A

mVA-1m-1