Which size of wire is minimum requirement for a 1.5Hp motor? Is 1.5mm copper wire safe or not?

 

Since you didn't say what voltage the motor operates at....*shrug* There's no way to know. The length of wire between to motor and power supply also makes a difference.

 

Since you didn't say what voltage the motor operates at....*shrug* There's no way to know. The length of wire between to motor and power supply also makes a difference.

Voltage is 220VAC and length is about 30 meters Sir.

 

The rating plate specifies 11.2A
Required size of cable will depend on many other factors - in order of importance:
1. The country in which it is being installed (regulations differ across the world)
2. The size of the circuit breaker or fuse that is protecting it.
3. The type of cable (armoured, twin-and-earth, flex etc.)
4. The temperature rating of the cable insulation.
5. How the cable is installed (in conduit, clipped to a wall, buried underground)

 

2.5mm2 minimum for that sort of load.

 

The rating plate specifies 11.2A
Required size of cable will depend on many other factors - in order of importance:
1. The country in which it is being installed (regulations differ across the world)
2. The size of the circuit breaker or fuse that is protecting it.
3. The type of cable (armoured, twin-and-earth, flex etc.)
4. The temperature rating of the cable insulation.
5. How the cable is installed (in conduit, clipped to a wall, buried underground)

I’m so sorry for incomplete question Sir.
1. Country is Myanmar(Burma) and voltage rating is 220V.
2. Circuit breaker I am using is 32A.
3. Type of cable is single( our local electricians usually call it single and we have to use separated colors of two wires to install).
4.Temperature rating of the wire insulation is 75 degree Celsius.
5. I am planning to install by clipping on the wall.
Thank you for your additional details.

 

I’m so sorry for incomplete question Sir.
1. Country is Myanmar(Burma) and voltage rating is 220V.
2. Circuit breaker I am using is 32A.
3. Type of cable is single( our local electricians usually call it single and we have to use separated colors of two wires to install).
4.Temperature rating of the wire insulation is 75 degree Celsius.
5. I am planning to install by clipping on the wall.
Thank you for your additional questions.

Based on British regulations it would probably be 4mm^2 for a 32A breaker (twin-and-earth, clipped direct)

 

The next-larger Wire-Size would be a better choice because of the ~30-Meter distance.

Over a ~30-Meter distance, the Voltage-Drop in the Wire starts to become a significant factor.

Voltage-Drop can cause the Motor to over-heat when subjected to Heavy-Loads.
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.
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The next-larger Wire-Size would be a better choice because of the ~30-Meter distance.

Over a ~30-Meter distance, the Voltage-Drop in the Wire starts to become a significant factor.

Voltage-Drop can cause the Motor to over-heat when subjected to Heavy-Loads.
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1.5mm^2 would be sufficient for 11.2A.
However, because the Mcb is 32A it needs to be 4mm^2, so it is already 2.6 times as big as it needs to be for the current, so I don‘t think it is necessary to go to 6mm^2 to reduce the voltage drop any further.

 

N.A. code regulations state that the wire gauge used cannot be lower than the breaker capacity.
In this case 32A breaker would require a #8 AWG = 10mm2.
Depends if the jurisdiction you are in allow any less.

 

Voltage is 220VAC and length is about 30 meters Sir.

The name-plate voltage is 220 volts, the name-plate current is 11.2 amps. Based on the USA standards, which are based on wire heating versus insulation life, you could get away with US wire size #14, that had 15 amp circuit protection.
BUT to handle the starting current and the voltage drop, a better choice would be the US wire size #12, rated to use 20 amp circuit protection.
Since the circuit protection is a 32 amp circuit breaker , I suggest US #10 wire, used for circuits with 30 amp protection. #8 would satisfy US codes, but as the application is elsewhere, and the running current is much less, #10 will be quite adequate.
Unfortunately I do not have the conversion between wire gage and metric diameter handy, and so that would need to be researched elsewhere. In addition, an open-air installation will not suffer as great a temperature rise as wires in conduit.

 

 

The name-plate voltage is 220 volts, the name-plate current is 11.2 amps. Based on the USA standards, which are based on wire heating versus insulation life, you could get away with US wire size #14, that had 15 amp circuit protection.
BUT to handle the starting current and the voltage drop, a better choice would be the US wire size #12, rated to use 20 amp circuit protection.
Since the circuit protection is a 32 amp circuit breaker , I suggest US #10 wire, used for circuits with 30 amp protection. #8 would satisfy US codes, but as the application is elsewhere, and the running current is much less, #10 will be quite adequate.
Unfortunately I do not have the conversion between wire gage and metric diameter handy, and so that would need to be researched elsewhere. In addition, an open-air installation will not suffer as great a temperature rise as wires in conduit.

The OP is using a 32amp breaker which by N.A. standards is not only not allowed, it would be considered dangerous using 1.5mm2 conductor.
Read post #10.

 

The OP is using a 32amp breaker which by N.A. standards is not only not allowed, it would be considered dangerous using 1.5mm2 conductor.
Read post #10.

Certainly the unthinking application of the code does not allow for any variations no matter what. But at some point it is reasonable to consider the actual situation, rather than just reading the script.
We know that the steady state load will be 11.2 amps if the motor is run with full load. We know that the wire will be surface mounted , not in conduit. And we know that it will be in an area where the national electrical code is not enforced. We also know that for the NEC size ratings, heating was the primary concern.
Thus it is quite reasonable to stick with number ten wire for this application, because it is a single device dedicated circuit.

 

Were it me, I would use the accepted breaker size in order to use a an economic cable size especially if dedicated circuit.
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