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Current Carrying Capacity

AMPACITY

The maximum current carrying capacity “AMPS” a single copper conductor can carry before melting either conductor and or insulation.
THE LIMITING FACTOR in the amount of current that can be passed through a copper wire depends on;

  1. CONDUCTOR SIZE:

Larger the size, the more current carrying capacity.

  1. HEAT GENERATED:

Less than the temperature rating of the insulation.

  1. TEMPERATURE:

Higher the ambient temperature the less current generated heat to reach maximum insulation rating.

  1. NO. OF CONDUCTORS:

Less heat dissipation as the number of conductors is increased.

  1. INSTALLATION:

In conduit, ducts, trays, etc. restrict heat dissipation.

SUGGESTED GUIDE FOR LOW POWER ELECTRONIC COPPER CABLES

Cond.
Size

 Ampacity @

80°C

90°C

105°C

125°C

150°C

200°C

24
22
20
18
16

6
8
10
15
19

7
9
12
17
22

7
10
13
18
24

8
11
14
20
26

9
14
18
27
32

10
17
22
31
39

Derating Factor for
Multi-Conductor
No. of

Cond.

 Factor(x amps)

2 – 5
6 – 15
16 – 30

0.8
0.7
0.5

PER CANADIAN ELECTRICAL CODE for single copper conductors.
Figures in (  ) for not more that 3 copper conductors.
Based on @ 30°C ambient temperature.

Conductor Size

** Allowable Ampacity @

60°C

90°C

110°C

125°C

200°C

14
12
10

20
25
40

(15)
(20)
(30)

20
25
40

(15)
(20)
(30)

40
50
65

(30)
(35)
(45)

40
50
70

(30)
(40)
(50)

45
55
75

(30)
(40)
(55)

8
6
4

55
80
105

(40)
(55)
(70)

70
100
135

(45)
(65)
(85)

85
120
160

(60)
(80)
(105)

90
125
170

(65)
(85)
(115)

100
135
180

(70)
(95)
(120)

2
1
1/0

140
165
195

(100)
(110)
(125)

180
210
245

(120)
(140)
(155)

210
245
285

(135)
(160)
(190)

225
265
305

(145)
(170)
(200)

240
280
325

(165)
(190)
(225)

2/0
3/0
4/0

225
260
300

(145)
(165)
(195)

285
330
385

(185)
(210)
(235)

330
385
445

(215)
(245)
(275)

355
410
475

(230)
(265)
(310)

370
430
510

(250)
(285)
(340)

** Based on the type of approved conductor and insulation
FOR COMPLETE INFORMATION AND CORRECTION FACTORS ABOVE 30°C AMBIENT TEMPERATURE, REFER TO THE CANADIAN ELECTRICAL CODE.

 

SUGGESTED GUIDE FOR LOW POWER ELECTRONIC COPPER CABLES





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