R

TE

CH

NIC

AL

INF

OR

MA

TIO

N

272 SOUTH EAST

Erith (Head Office)

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TABLE 4E4A Multicore 900C armoured thermosetting insulated

cables (Copper Conductors)

Current Ratings

7

Ambient temperature : 30°C

Ground ambient temperature: 20°C

Conductor operating temperature:90°C CURRENT-CARRYING CAPACITY (amperes):

Conductor

cross-

sectional

area

1

Reference Method C

(clipped direct)

Reference Method E

(in free air or on a perforated

cable tray horizontal or vertical

1 two

core cable,

single phase

a.c. or d.c.

2

1 three- or four-

core cable,

three-phase a.c.

3

1 two

core cable,

single phase

a.c. or d.c.

4

1 three- or four-

core cable,

three-phase a.c.

5

(mm²)

1.5

2.546

1016

2535507095

120150185240300

400

(A)

25

3344567899

131162197251304

353406463546628

728

(A)

29

39526690115

152188228291354

410472539636732

847

(A)

23

3142537394

124154187238289

335386441520599

673

(A)

27

36496285110

146180219279338

392451515607698

787

Reference Method D

(direct in groundor in ducting in

ground, in or around buildings)

1 two

core cable,

single phase

a.c. or d.c.

6

1 three- or four-

core cable,

three-phase a.c.

7

(A)

21

2836445875

96115135167197

223251281324365

-

(A)

25

3343537191

116139164203239

271306343395446

-

NOTES:

1. Where a conductor

operates at a temperature

exceeding 70°C it must

be ascertained that the

equipment connected to

the conductor is suitable

for the conductor operat-

ing temperature (see

Regulation 512.1.2).

2. Where cables in this

table are connected to

equipment or accessories

designed to operate at a

temperature not exceed-

ing 70°C, the current

ratings given in the equiv-

alent table for 70°C ther-

moplastic insulated cables

(Table 4D4A) must be

used (see also Regulation

523.1)

VOLTAGE DROP (per ampere per metre) TABLE 4E4B Conductor operating temperature: 90°C

Conductor

cross-

sectional

area

1

Two-core

cable, d.c.

2

Two-core cable,

single-phase a.c.

3

Three- or four-core cable,

three-phase a.c.

4

(mm²)

1.5

2.546

1016

(mV/A/m)

31

19127.94.72.9

(mV/A/m)

31

19127.94.72.9

r x z

(mV/A/m)

27

16106.84.02.5

r x z

25

35

50

70

95

120

150

185

240

300

400

1.85

1.35

0.98

0.67

0.49

0.39

0.31

0.25

0.195

0.155

0.120

1.85

1.35

0.99

0.67

0.50

0.40

0.32

0.26

0.20

0.16

0.13

0.160

0.155

0.155

0.150

0.150

0.145

0.145

0.145

0.140

0.140

0.140

1.90

1.35

1.00

0.69

0.52

0.42

0.35

0.29

0.24

0.21

0.190

1.60

1.15

0.86

0.59

0.43

0.34

0.28

0.22

0.175

0.140

0.115

0.140

0.135

0.135

0.130

0.130

0.130

0.125

0.125

0.125

0.120

0.120

1.65

1.15

0.87

0.60

0.45

0.37

0.30

0.26

0.21

0.185

0.165

All tables are reproduced by kind permission of The Institution of Engineering & Technology from IEE Regs, 17th Edition However, it should be noted that in

order to apply these tables correctly, reference is required to appendix 4 of the 17th edition of the wiring regualtions which may be obtained from: Institution

of Engineering & Technolgy, Michael Faraday House,Six Hills Way, Stevenage, Hertfordshire, ENGLAND, SG1 2AY.