Maximum Current

 

 
max. Current Load for Cu Cables / needed Fuse (Ampere)
max. Temperature 30C / Reduction Factor 0.71 for 45C (Rubber Insulation)
  Installation inside Pipes Single Conductor Installation in Installation Racks Multi-Conductor open PVC Cable Single Conductor on Isolator
Conductors: 2 3 4 2 3 4 3 2 to 4
qmm                
0.5 6.5 6 - 7.5 6.5 6 - -
0.75 10 8 - 10 10 8 - -
1 10 8 8 12 10 8 - 12
1.5 12 12 10 16 12 12 12 16
2.5 20 16 16 20 20 16 20 25
4 25 20 20 25 25 20 25 32
6 32 32 25 40 32 32 32 40
10 50 40 40 50 50 40 50 63
16 63 63 50 63 63 63 63 80
25 80 80 63 100 80 80 80 100
35 100 100 80 125 100 100 100 125
50 125 100 - 125 125 100 - 160
70 160 125 - 160 160 125 - 200
95 200 160 - 200 200 160 - 250
Reduction Factor for several Multi-Conductor Cables in the same Pipe:
Number of Cables in the Pipe 2 4 8 12 16 20
Reduction of the max. Current by: 0.8 0.65 0.52 0.45 0.41 0.38


US National Electrical Code
maximum Current
AWG Wire Size Two Current Carrying Conductors Three Current Carrying Conductors
  Ampere Ampere
18 7 10
16 10 13
14 15 18
12 20 25
10 25 30
8 35 40
6 45 55
4 60 70
2 80 95


Amperage for Power Extension Cords
(always uncoil the cord completely under oreration)
14 / 3 AWG Cable
Length Current
50' 15 A
100' 13 A
150' 8 A
200' 6 A
250' 5 A
300' 4 A
12 / 3 AWG Cable
Length Current
50' 15 A
100' 15 A
150' 13 A
200' 10 A
250' 7 A
300' 6 A
10 / 3 AWG Cable
Length Current
50' 15 A
100' 15 A
150' 15 A
200' 15 A
250' 13 A
300' 10 A


AWG / Amperage and Connectors
AWG max. Current Connector
0000 (4/0) 300 A CamLock
000 (3/0) 260 A CamLock
00 (2/0) 225 A CamLock
0 (1/0) 195 A CamLock
2 125 A C-Way (50')
4 90 A C-Way (50')
6 70 A Joy&Cabtire (25'&50')
8 50 A Joy&Cabtire (25'&50')
10 30 A Joy&Cabtire (25'&50')
12 20 A A.C. Wire (25'&50')
14 15 A A.C. Wire (25'&50')
16 10 A A.C. Wire



Suggestions for lo-voltage wiring in cars:

Squaremax. Current
0.5 mm10.6 A
0.75 mm7.8 A
1 mm13.5 A
1.5 mm17 A
2.5 mm22.7 A
4 mm29.8 A
6 mm38.3 A



Maximum wire square and maximum wire length (length of the cable with both wires molded inside) for a current of 0.5 Ampere:

AWGwire square in mm2max. cable length in meter
200,565,00
220,343,33
240,222,08
260,141,31
280,090,81