Cable size calculator, Cable rating Chart, Cable Selection Calculator

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.

Choose Motor Power:
Motor Power: kW
Motor Line Current in amps: A
Motor Phase Current in amps: A
Starter Type:
Circuit Breaker Selection: A
Main Contactor Size: A
Delta Contactor Size: A
Star Contactor Size: A
Overload Relay Size: Amps
Required Cable Size: Sqmm
Recommended Cable Size: Sqmm
Cable Gland Size MM
Terminal Block Size: A
Cable Lug Size: Sqmm
Recommended Crimping Tool: MM
Control Wiring Cable Size: Sqmm
Power Wiring Cable Size: Sqmm
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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
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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.

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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Hope all the data will help you.

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