⚡wire size recommendation

 🔹1. Basic Principle

The size of the wire depends on a things.
* The current in amps
* The length of the cable
* The voltage drop
* The type of load like lighting or a motor or an air conditioner

🔹2. Current Formula

First you need to calculate the current.
 👉For Single Phase:
You can find the current by dividing the power by the voltage.
So the formula is I = power divided by voltage.
👉For 3-Phase:
The formula is a bit different.
You find the current by dividing the power by the root of 3 times the voltage times the power factor.

 🔹3. Standard Copper Wire Size Table

Here is a table to help you choose the wire size.
| Current in Amps | Wire Size in mm² | Typical Use |
| 6–10 A | 1.0 mm² | This wire size is good for lighting
| 10–16 A | 1.5 mm² | This wire size is good for lights and small loads |
| 16–25 A | 2.5 mm² | This wire size is good for sockets |

|25–32 A 4 mm² | This wire size is good for sockets |

| 32–40 A | 6 mm² | This wire size is good for air conditioners or heaters |
|40–63 A 10 mm² | This wire size is good for the supply |

| 63–80 A | 16 mm² | This wire size is good for submain |

| 80–100 A | 25 mm² | This wire size is good for distribution |

 🔹4. Quick Selection Rule

👉There is a rule that electricians use.
1 Mm² of copper wire is good for 6 to 8 amps.

🔹 5. Voltage Drop Consideration

You need to keep the voltage drop
For lighting it should be than 3%.
For power circuits it should be than 5%.
👉If the distance is long you should increase the wire size.

🔹6. Single phase Example Calculation

Lets say you have a load of 5 kW and a voltage of 230V.
First you calculate the current.
Current is 5000 divided by 230 which's approximately 21.7 A.
So you should use a wire size of least 2.5 mm².
👉To be safe you can use a 4 mm² wire.

🔹 7. 3-Phase Example calculation 

Lets say you have a load of 10 kW a voltage of 400V and a power factor of 0.9.
First you calculate the current.
Current is 16 A.
👉So you can use a wire size of 2.5 mm² or 4 mm².

 🔹8. Important Safety Tips⚠️

You should always match the MCB and the cable size.
Never overload the wires.
Use PVC or XLPE insulated cables.
Follow the local standards.

 🔹9. Professional Recommendation Table

Here is a table with some recommendations.
| Application | Recommended Wire Size |
| Lighting 1.5 mm² |
| Socket outlets | 2.5 mm² |
| Air Conditioner | 4–6 mm² |
Water Heater | 4–6 mm² |
Main Supply | 10–16 mm² |

✅ Final Tip

Always choose a wire size that is one size higher for safety.
Consider the load expansion.
For motors consider the starting current.

⚡ Wire Size Calculator

Load (Watts) Voltage (V) Phase Single Phase 3 Phase Power Factor

Result will appear here