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Wire/Cable calculation
Categories
Wire/Cable calculation
Current calculation
Motor calculation
Conversion calculation
Transformer calculation
Basis calculation
Resources
Pinout
Wire size
Standard
*
IEC
NEC
Current type
*
Direct current
Alternating single-phase
Alternating two-phase
Alternating three-phase
Voltage
*
V
Load1
*
W
kW
HP
A
VA
kVA
MVA
Line length
*
m
ft
yd
Max voltage drop
*
%
V
Method of installation
*
1-A1|Insulated conductorsor single-core cables in conduit in a thermally insulated wall
2-A2|Multi-core cablesin conduit in a thermally insulated wall
3-A1|Multi-core cable direct in a thermally insulated wall
4-B1|Insulated conductorsor single-core cables in conduit on a wooden or masonry wall or spaced lessthan 0.3 × conduit diameter from it
5-B2|Multi-core cable in conduit on a wooden or masonry wall or spaced lessthan 0.3 × conduit diameter from it
6-B1|Insulated conductorsor single-core cables in cable trunking (includes multi-compartment trunking) on a wooden or masonry wall run horizontally or vertically
8-B2|Multi-core cable in cable trunking (includes multi-compartment trunking) on a wooden or masonry wall run horizontally or vertically
10-B1|Insulated conductorsor single-core cable in suspended cable trunking
11-B2|Multi-core cable in suspended cable trunking
12-A1|Insulated conductorsor single-core cable run in mouldings
15-A1|Insulated conductorsin conduit or singlecore or multi-core cable in architrave
16-A1|Insulated conductorsin conduit or singlecore or multi-core cable in window frames
20-C|Single-core or multi-core cables fixed on, or spaced lessthan 0.3 × cable diameter from a wooden or masonry wall
21-C|Single-core or multi-core cables fixed directly under a wooden or masonry ceiling
22-E|Single-core or multi-core cablesspaced from a ceiling
30-C|Single-core or multi-core cableson unperforated tray run horizontally or vertically
31-F|Single-core cable on perforated tray run horizontally or vertically
31-E|Multi-core cable on perforated tray run horizontally or vertically
32-F|Single-core cable on bracketsor on a wire meshtray run horizontally or vertically
32-E|Multi-core cable on bracketsor on a wire meshtray run horizontally or vertically
33-F|Single-core cable spaced more than 0.3 timescable diameter from a wall
33-E|Multi-core cable spaced more than 0.3 timescable diameter from a wall
34-F|Single-core cable on ladder
34-E|Multi-core cable on ladder
35-F|Single-core cable suspended from or incorporatinga support wire or harness
35-E|Multi-core cable suspended from or incorporatinga support wire or harness
36-G|Bare or insulated conductorson insulators
40-B2|Single-core or multi-core cable in a building void（1.5De＜=V＜5De）
40-B1|Single-core or multi-core cable in a building void（5De＜=V＜20De）
42-B2|Single-core or multi-core cable in conduit in a building void（1.5De＜=V＜20De）
42-B1|Single-core or multi-core cable in conduit in a building void（V＞20De）
44-B2|Single-core or multi-core cable ducting in a building void（1.5De＜=V＜20De）
44-B1|Single-core or multi-core cable ducting in a building void（V＞20De）
46-B2|Single-core or multi-core cable in cable ducting in masonry havinga thermal resistivity not greater than 2 K·m/W（1.5De＜=V＜20De）
46-B1|Single-core or multi-core cable in cable ducting in masonry havinga thermal resistivity not greater than 2 K·m/W（V＞20De）
47-B2|Single-core or multi-core cable in a ceiling void or in a raised floor（1.5De＜=V＜5De）
47-B1|Single-core or multi-core cable in a ceiling void or in a raised floor（5De＜=V＜50De）
50-B1|Insulated conductorsor single-core cable in flushcable trunking in the floor
51-B2|Multi-core cable in flushcable trunking in the floor
52-B1|Insulated conductorsor single-core cables in flushcable trunking
53-B2|Multi-core cable in flushtrunking
54-B2|Insulated conductorsor single-core cables in conduit in an unventilated cable channel run horizontally or vertically（1.5De＜＝V＜20De）
54-B1|Insulated conductorsor single-core cables in conduit in an unventilated cable channel run horizontally or vertically（V＞＝20De）
56-B1|Single-core or multi-core cable in an open or ventilated cable channel run horizontally or vertically
57-C|Single-core or multi-core cable direct in masonry havinga thermal resistivity not greater than 2 K·m/W
59-B1|Insulated conductorsor single-core cables in conduit in masonry
60-B2|Multi-core cablesin conduit in masonry
70-D1|Multi-core cable in conduit or in cable ducting in the ground
71-D1|Single-core cable in conduit or in cable ducting in the ground
72-D2|Sheathed single-core or multi-core cables direct in the ground
Ambient temperature
*
10°C｜50°F
15°C｜59°F
20°C｜68°F
25°C｜77°F
30°C｜86°F
35°C｜95°F
40°C｜104°F
45°C｜113°F
50°C｜122°F
55°C｜131°F
60°C｜140°F
65°C｜149°F
70°C｜158°F
75°C｜167°F
80°C｜176°F
Conductor
*
Copper
Aluminum
Insulation
*
PVC
XLPE/EPR
Circuits in the same conduit
*
1
2
3
4
5
6
7
8
9
12
16
20
Load increase
*
%
Maximum allowable wire size
*
300mm²
240mm²
185mm²
150mm²
120mm²
95mm²
70mm²
50mm²
35mm²
25mm²
16mm²
10mm²
6mm²
4mm²
2.5mm²
1.5mm²
Derating factor for parallel cables (present or no present)
*
Yes
No
Allow smaller sections of 1.5 mm²
*
Yes
No
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