Cable size calculator:
Choose the three-phase motor capacity in HP. Then our cable size calculator will give you the suitable internal control cable size, internal power cable size, panel to motor outgoing cable size etc. The reset button is used to clear the values in the field. This 3 phase motor cable size calculator is developed based on my practical experience.
3 phase motor cable size calculator is developed for designing the three-phase electrical motors starter’s material such as internal cable wiring, outgoing cable calculation, required cable gland size, Cable connector size, overload relay size, required fuse size, circuit breaker, MCCB size, MPCB size, cable lug size, and the terminal block size for all the electrical motors. Also, you can get the amps of the motor.
Cable rating Chart:
Look at the table of cable rating for PVC insulated armoured cable and non-armoured cable.
Cable Rating Chart | |||
Size of cable mm² | Cable Diameter (mm) | Non-SWG | SWG |
1.5 | 2.9 | 20 | 18 |
2.5 | 3.53 | 26 | 24 |
4 | 4.4 | 36 | 31 |
6 | 4.68 | 45 | 41 |
10 | 5.98 | 61 | 56 |
16 | 6.95 | 81 | 73 |
25 | 8.7 | 106 | 97 |
35 | 10.08 | 130 | 119 |
50 | 11.8 | 160 | 147 |
70 | 13.5 | 200 | 180 |
95 | 15.7 | 240 | 219 |
120 | 17.4 | 280 | 257 |
150 | 19.3 | 320 | 295 |
180 | 21.5 | 365 | 333 |
240 | 24.6 | 430 | 393 |
300 | 27.9 | 500 | 451 |
400 | 30.8 | 610 | 523 |
500 | 33.8 | 710 | – |
630 | 37.6 | 820 | – |
Cable size calculation formula:
The cable size is equal to the 1.5 times of the full load current of the motor/load. Hence the cable rating formula can be written as,
Cable size = 1.5 x Full Load Current.
Example:
Let’s we calculate required cable sizing for 5.5kW/7.5HP motor which is operated at 415V, 0.86pf.
From our cable size calculator, the full load current of the 5.5kW motor is 10A.
Cable size = 1.5 x 10 =15 A
Hence, the required cable shall able to carry minimum 15A current. Look at the Cable current rating Chart, 2.5Sqmm copper has the ability to carry 18 Amps, hence 2.5sqmm is suitable for 5.5kW/7.5HP motor
Note that, we did not include the voltage drop across the cable.
3 phase motor cable size, Contactor size, Starter selection chart:
Here, we have collected for cable size for all rating motor such as, 0.37kW/0.5HP, 0.55kW/0.75HP, 0.75kW/1.0HP, 1.1kW/1.5HP, 1.5kW/2.0HP, 2.2kW/3HP, 3.7kW/5HP, 5.5kW/7.5HP, 7.5kW/10HP, 9.3kW/12.5HP, 11kW/15HP, 15kW/20HP, 18.5kW/25HP, 22kW/30HP, 30kW/40HP, 37kW/50HP, 45kW/60HP, 55kW/75HP, 75kW/100HP, 90kW/120HP, 110kW/150HP, 132kW/175HP, and 150kW/200HP.
0.5HP Motor:
0.5HP Motor cable Size, Contactor Size, Relay Size Chart | ||
Description | Size | Price Check |
Motor kW: | 0.37/0.5HP | Amazon |
Full Load Current-1ph | 1 | |
Full Load Current-3ph | 0.6 | |
DOL Starter (recommended) | ||
MPCB/MCB | 1.6A | Amazon |
Overload Relay Range | 0.75 to 1.1 | Amazon |
Contactor Size – AC3 | 9A | Amazon |
Max. Backup fuse | 4 | |
Required cable Size | 1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 6A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping size – Hand | 2.5 Sqmm | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16MM | Amazon |
Cable Tie | 100MM | Amazon |
0.55kW/0.75HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Description | Size | Price Check |
Motor kW/HP: | 0.55/0.75 | Amazon |
FLA Single phase | 1.3 | |
FLA Three phase | 0.76 | |
DOL Starter Recommended | DOL | |
MPCB | 2.4 A | Amazon |
Overload Relay Range | 0.75 – 1.1 A | Amazon |
Contactor Size | 6A | Amazon |
Max. Backup fuse | 4 | |
Required cable Size | 3Cx1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 6A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16MM | Amazon |
Cable Tie | 100MM | Amazon |
0.75kW/1HP Motor Cable, Gland, Lug, Contactor Selection Chart:
1 HP Motor Cable Size Chart, Contactor Size, Relay Size | ||
Description | Size | Price Check |
Motor kW/HP: | 0.75/1 | |
Amps Single phase | 3.8 | Amazon |
Amps Three phase | 1.3 | Amazon |
DOL Starter (recommended) | DOL | Amazon |
MPCB | 2.4 | Amazon |
Overload Relay Range | 1.1 to 1.6 | Amazon |
Contactor Size | 6A | Amazon |
Max. Backup fuse | 6 | |
Required cable Size | 1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 6A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16mm | Amazon |
Cable Tie | 100MM | Amazon |
1.1kW/1.5HP Motor Cable, Gland, Lug, Contactor Selection Chart:
1.5 HP Motor Cable Size Chart, Contactor Size, Relay Size | ||
Details | Size | Price Check |
Motor kW/HP: | 1.1/1.5 | |
FLA Single phase | 5.7 | Amazon |
FLA Three phase | 1.9 | Amazon |
DOL Starter | DOL | Amazon |
MPCB | 2.4 A | Amazon |
Overload Relay Range | 1.5 to 3A | Amazon |
Contactor Size | 6A | Amazon |
Max. Backup fuse | 4 | Amazon |
Required cable Size | 1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 6A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16mm | Amazon |
Cable Tie | 100MM | Amazon |
1.5kW/2HP Motor Cable, Gland, Lug, Contactor Selection Chart:
2 HP Motor Cable Size Chart, Contactor Size, Relay Size | ||
Details | Size | Price Check |
Motor kW/HP: | 1.5kW/2HP | Amazon |
FLA Single phase | 7.6 | Amazon |
FLA Three phase | 2.6 | Amazon |
DOL Starter (recommended) | DOL | Amazon |
MPCB | 3.2 A | Amazon |
Overload Relay Range | 1.5 to 3.2A | Amazon |
Contactor Size | 12A | Amazon |
Max. Backup fuse | 10A | |
Required cable Size | 1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 10A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16mm | Amazon |
Cable Tie | 100MM | Amazon |
2.2kW/3HP Motor Cable, Gland, Lug, Contactor Selection Chart:
3 HP Motor Cable Size Chart, Contactor Size, Relay Size | ||
Details | Size | Price Check |
Motor kW/HP: | 2.2/3 | |
FLA Single phase | 11.1 | Amazon |
FLA Three phase | 4 | Amazon |
DOL Starter | DOL | Amazon |
MPCB | 6 A | Amazon |
Overload Relay Range | 3.2A to 5A | Amazon |
Contactor Size | 16A | Amazon |
Max. Backup fuse | 16A | |
Required cable Size | 1.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 10A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 16MM | Amazon |
Cable Tie | 100MM | Amazon |
3.7kW/5HP Motor Cable, Gland, Lug, Contactor Selection Chart:
5 HP Motor Cable Size Chart, Contactor Size, Relay Size | ||
Details | Size | Price Check |
Motor kW/HP: | 3.7/5 | |
FLA Single phase | 18.7 | |
FLA Three phase | 6.4 | Amazon |
DOL Starter | DOL | Amazon |
MPCB | 8A | Amazon |
Overload Relay Range | 5A to 8A | Amazon |
Contactor Size | 16A | Amazon |
Max. Backup fuse | 16A | |
Required cable Size | 2.5 Sqmm | Amazon |
Recommended Cable | 2.5Sqmm | Amazon |
Terminal Block | 10A | Amazon |
Cable Lug Size | 2.5Sqmm | Amazon |
Crimping tie | 2.5 Sq | Amazon |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | Amazon |
Cable Gland Size | 19mm | Amazon |
Cable Tie | 100MM | Amazon |
5.5kW/7.5HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 5.5/7.5 | |
FLA Single phase | 28.3 | |
FLA Three phase | 9.7 | |
DOL Starter | DOL | |
MPCB | 16A | |
Overload Relay Range | 10A to 13A | |
Contactor Size | 25A | |
Max. Backup fuse | 25A | |
Required cable Size | 2.5Sqmm | |
Recommended Cable | 2.5Sqmm | |
Terminal Block | 16A | |
Cable Lug Size | 2.5Sqmm | |
Crimping tie | 2.5 Sq | |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm | |
Cable gland Size | 19mm |
7.5kW/10HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 7.5/10 | |
FLA Single phase | 28.3 | |
FLA Three phase | 13 | |
DOL Starter | DOL | |
MPCB | 16A | |
Overload Relay Range | 10 to 13A | |
Contactor Size | 32A | |
Max. Backup fuse | 32A | |
Required cable Size | 2.5Sqmm | |
Recommended Cable | 4Sqmm | |
Terminal Block | 25A | Amazon |
Cable Lug Size | 4Sqmm | |
Crimping tie | 4 Sq | |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 4 Sqmm | |
Cable Gland Size | 22mm |
9.3kW/12.5HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 9.3/12.5 | |
FLA Three phase | 17 | |
DOL Starter | DOL | |
MPCB | 20A | |
Overload Relay Range | 16A to 22A | |
Contactor Size | 32A | |
Max. Backup fuse | 32A | |
Required cable Size | 4Sqmm | |
Recommended Cable | 4Sqmm | |
Terminal Block | 25A | Amazon |
Cable Lug Size | 2.5Sqmm | |
Crimping tie | 2.5 Sq | |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 4 Sqmm | |
Cable Gland Size | 22mm |
11kW/15HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 11/15 | |
FLA Single phase | 19 | |
FLA Three phase | 19 | |
DOL Starter | Star/Delta | |
MPCB | 25 A | |
Overload Relay Range | 18A to 25A | |
Contactor Size | 32A | |
Max. Backup fuse | 32A | |
Required cable Size | 4 Sqmm | |
Recommended Cable | 4Sqmm | |
Terminal Block | 6A | Amazon |
Cable Lug Size | 2.5Sqmm | |
Crimping tie | 2.5 Sq | |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 2.5 Sqmm |
15kW/20HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 15/20 | |
FLA Single phase | 1.3 | |
FLA Three phase | 26 | |
Star delta Starter | Star/Delta | |
MPCB | 32A | |
Overload Relay Range | 23A – 28A | |
Main Contactor Size | 32 | |
Delta Contactor Size | 32 | |
Star Contactor Size | 16A | |
Max. Backup fuse | 63A | |
Required cable Size | 6Sqmm | |
Recommended Cable | 6Sqmm | |
Terminal Block | 32A | Amazon |
Cable Lug Size | 6Sqmm | |
Crimping tie | 6Sqmm | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 10Sqmm | |
Cable gland Size | 22mm |
18.5kW/25HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 18.5/25 | |
FLA Three phase | 32 | |
Star/Delta Starter | Star/Delta | |
MPCB | 32A | |
Overload Relay Range | 30 – 36A | |
Main Contactor Size | 32A | |
Delta Contactor Size | 32A | |
Star Contactor Size | 12A | |
Max. Backup fuse | 63A | |
Required cable Size | 10sqmm Copper or 2RX10Sqmm Al | |
Recommended Cable | 16Sqmm Copper | |
Terminal Block | 63A | Amazon |
Cable Lug Size | 16Sqmm Copper | |
Crimping tie | 16Sqmm pit | |
Starter Control Wiring | 1.5sqmm | Amazon |
Starter Power Wiring | 16Sqmm Copper Flex | |
Cable gland Size | 28MM |
Details | Size | Price Check |
Motor kW/HP: | 22/30 | |
FLA Three phase | 38.9 | |
DOL Starter | Star/Delta | |
MPCB | 40A | |
Overload Relay Range | 36 – 45A | |
Main Contactor Size | 38 | |
Delta Contactor Size | 38 | |
Star Contactor Size | 25A | |
Max. Backup fuse | 63A | |
Required cable Size | 25Sqmm copper or 2RX16Sqmm Al | |
Recommended Cable | 25Sqmm Copper | |
Terminal Block | 63A | Amazon |
Cable Lug Size | 25Sqmm Copper | |
Crimping tie | 16MMX25MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 25Sqmm | |
Cable gland Size | 28MM |
30kW/40HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 30/40 | |
FLA Three phase | 52 | |
DOL Starter | Star/Delta | |
MPCB | 63A | |
Overload Relay Range | 47 – 57A | |
Main Contactor Size | 65 | |
Delta Contactor Size | 65 | |
Star Contactor Size | 32 | |
Max. Backup fuse | 125A | |
Required cable Size | 35Sqmm Copper or 2RX25Sqmm | |
Recommended Cable | 2RX25Sqmm | |
Terminal Block | 125A | Amazon |
Cable Lug Size | AL x 25Sqmm | |
Crimping tie | 16MMx25MM | |
Starter Control Wiring | 1.5 Sqmm | Amazon |
Starter Power Wiring | 35Sqmm Copper Flex | |
Cable gland Size | 29MM |
37.5kW/50HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 37.5/50 | |
FLA Three phase | 64.3 | |
DOL Starter | Star/Delta | |
MCCB | 63A to 125A | |
Overload Relay Range | 62 – 73A | |
Main Contactor Size | 70A | |
Delta Contactor Size | 70A | |
Star Contactor Size | 32A | |
Max. Backup fuse | 125A | |
Required cable Size | 50Sqmm Copper or 2Rx35Smm AL | |
Recommended Cable | 50Sqmm Copper | |
Terminal Block | 125A | Amazon |
Cable Lug Size | 50Sqmm Copper | |
Crimping tie | 35MMx50MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 2Rx35Sqmm | |
Cable Gland | 32MM |
45kW/60HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 45kW/60HP | |
FLA Three phase | 78.3 | |
Star/Delta Starter | Star/Delta | |
MCCB | 125A | |
Overload Relay Range | 70 – 95A | |
Main Contactor Size | 75 | |
Delta Contactor Size | 75 | |
Star Contactor Size | 45 | |
Max. Backup fuse | 160A | |
Required cable Size | 50Sqmm Copper or 2Rx35Sqmm | |
Recommended Cable | 2Rx50Sqmm, AL | |
Terminal Block | 160A | Amazon |
Cable Lug Size | 50Sqmm AL | |
Crimping tie | 35MMx 50MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 1Rx35Sqmm Main&Delta | |
Cable gland Size | 35MM |
55kW/75HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 55kW/75HP | |
FLA Three phase | 90 | |
Phase Current | 52.0 | |
DOL Starter | Star/Delta | |
MPCB | 160A | |
Overload Relay Range | 85 – 105A | |
Main Contactor Size | 75A | |
Delta Contactor Size | 75A | |
Star Contactor Size | 45A | |
Max. Backup fuse | 160A | |
Required cable Size | 70Sqmm Copper or 2Rx50qmm AL | |
Recommended Cable | 2Rx50qmm AL | |
Terminal Block | 160A | Amazon |
Cable Lug Size | 50Sqmm | |
Crimping tie | 35MMx 50MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 2Rx50Sqmm, Cu, Flexi | |
Cable gland Size | 35MM |
75kW/100HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 75kW/100HP | |
FLA Three phase | 132 | |
Phase Current | 76.2 | |
DOL Starter | Star/Delta | |
MCCB | 250A | |
Overload Relay Range | 132-170A | |
Main Contactor Size | 140A | |
Delta Contactor Size | 140A | |
Star Contactor Size | 70A | |
Max. Backup fuse | 250A | |
Required cable Size | 2Rx70Sqmm Al | |
Recommended Cable | 2Rx70Sqmm Al | |
Terminal Block | 250A | Amazon |
Cable Lug Size | 70Sqmm, Ring type | |
Crimping tie | 50MMx70MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 50Sqmm Copper Flex | |
Cable gland Size | 40MM |
90kW/125HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 90kW/125HP | |
FLA Three phase | 155 | |
DOL Starter | ||
MCCB | 250A | |
Overload Relay Range | 115 – 180A | |
Main Contactor Size | 170A | |
Delta Contactor Size | 170A | |
Star Contactor Size | 110A | |
Max. Backup fuse | 400A | |
Required cable Size | ALx2Rx95Sqmm | |
Recommended Cable | ALx2Rx120Sqmm | |
Terminal Block | 250A | Amazon |
Cable Lug Size | 120Sqmm | |
Crimping tie | 95MMx125MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 70Sqmm Copper Flex | |
Cable gland Size | 40MM |
110kW/150HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 110kW/150HP | |
FLA Three phase | 178 | |
DOL Starter | ||
MCCB | 400A | |
Overload Relay Range | 160 – 250A | |
Main Contactor Size | 205A | |
Delta Contactor Size | 205A | |
Star Contactor Size | 110A | |
Max. Backup fuse | 400A | |
Required cable Size | 2Rx120Sqmm | |
Recommended Cable | 2Rx150Sqmm | |
Terminal Block | 400A | Amazon |
Cable Lug Size | 150Sqmm | |
Crimping tie | 120MMx150MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 90Sqmm Copper Flex | |
Cable gland Size | 44MM |
132kW/175HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 132kW/175HP | |
FLA Three phase | 233.5 | |
DOL Starter | ||
MCCB | 400A | |
Overload Relay Range | 200 – 320 | |
Main Contactor Size | 250A | |
Delta Contactor Size | 250A | |
Star Contactor Size | 150A | |
Max. Backup fuse | 400A | |
Required cable Size | AL, 2Rx150Sqmm | |
Recommended Cable | AL, 2Rx150Sqmm | |
Terminal Block | 400A | Amazon |
Cable Lug Size | 150Sqmm | |
Crimping tie | 120MMx150MM | |
Starter Control Wiring | 1.5Sqmm | |
Starter Power Wiring | 95Sqmm copper Flex | |
Cable gland Size | 44MM |
150kW/200HP Motor Cable, Gland, Lug, Contactor Selection Chart:
Details | Size | Price Check |
Motor kW/HP: | 150kW/200HP | |
FLA Three phase | 259.5 | |
DOL Starter | ||
MCCB | 400A | |
Overload Relay Range | 250 – 400A | |
Main Contactor Size | 300 | |
Delta Contactor Size | 300 | |
Star Contactor Size | 170 | |
Max. Backup fuse | 400A | |
Required cable Size | 2Rx150Sqmm | |
Recommended Cable | 2Rx185Sqmm | |
Terminal Block | 400A | Amazon |
Cable Lug Size | 185Sqmm | |
Crimping tie | 150MMx185MM | |
Starter Control Wiring | 1.5Sqmm | Amazon |
Starter Power Wiring | 120Sqmm | |
Cable gland Size | 50MM |
Hope all the data will help you.
thanks for the inpermatuon
Comment:how do I get app for the calculations for motors
3CxALx2Rx50 please tell me what meaning of 2R
It means 2 Run, 3 core of 50 Sqmm Aluminium cable
What is the meaning of MPCB and FLA three phase
MPCB – Motor Protection Circuit Breaker.
FLA – Full Load Amps
Thanks very much for the information
What does SWG mean
சார் பயனுள்ள தகவல் நன்றி. இதேபோல் டிரைவுக்கு கேபுல் அளவு சொல்லுங்கள் சார்
GK
PLEASE, SEND THIS SOFTWER
Thanks for multi information electrical
Nice