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Low voltage circuit
Low voltage circuit
LV circuit
1
Conditions
2
Load
3
Cable size
4
Table
Method of installation
Conduit embedded or enclosed
Surface mounted conduit
Trunking (IPX4)
On unperforated tray
On perforated tray
Buried conduit in ground IEC 60364
Directly buried in ground IEC 60364
Mounted on wall or ceiling
Building voids
Tubo en pared aislante
Single-core cable on insulators
Arrangement (cables touching)
Bunched in air, surface, embedded or enclosed
Method
Ambient temperature
10
15
20
25
30
35
40
45
50
55
60
ºC
Depth
---
m
Thermal resistivity
---
K·m/Ω
Short circuit
kA
Isc duration
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
s
Power
Current
Copper
Aluminium
Single-core
Multi-core
Resume
Supply
3P+N+PE
3P+N/2+PE
3P+N
3P+N/2
3P+PE
1P+N+PE
1P+N
L-L+PE
L-L+
Voltage
*
V
SINGLE-PHASE
Insulation
PVC
XLPE
EPR
Number
*
Power
*
kW
Cos φ
*
Third harmonic
%
Utilization factor
*
Simultaneity factor
*
Length
*
m
Max voltage drop
*
%
Additional circuits
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Conductors per phase
1
2
3
4
5
6
7
8
9
10
11
12
Minimum size
1.5
2.5
4
6
10
16
25
35
50
70
95
120
150
185
240
mm²
Clearance
---
m
kr grouping
*
Protection
Circuit breaker IEC 60898
Circuit breaker IEC 60947-2
Fuse gG/gL
Fuse gPV
---
Current rated
2
4
6
10
16
20
25
32
40
50
63
80
100
125
160
200
250
320
400
500
630
800
1000
1250
1600
2000
2500
3200
4000
5000
6300
A
Ir (x In)
0.40
0.50
0.60
0.70
0.80
0.85
0.90
0.95
0.98
1.00
Resume
Sph (mm²)
Ia (A)
Ib/Ia (%)
Drop (%)
Ir (A)
Isc (kA) [0.1s]
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