Understanding the Importance of Cable Size in Electrical Systems
Electricity is an essential part of our daily lives, and it is important to ensure that the electrical systems are functioning efficiently and safely. One of the key factors that determine the efficiency and safety of an electrical system is the size of the cable. The size of the cable, also known as its cross-sectional area, is crucial in determining the amount of current it can carry safely.
In this article, we will explain the relationship between the size of the cable and the amount of current it can carry, and provide a comprehensive guide to help you calculate the correct cable size for your electrical system.
What is a Cable Size Chart?
A cable size chart is a reference tool that shows the relationship between the cross-sectional area of a cable and the amount of current it can carry safely. The chart provides an easy-to-use reference for determining the appropriate cable size for a given electrical system.
Why is Cable Size Important?
The size of the cable determines the amount of current it can carry safely. If the cable is too small, it can become overloaded and overheat, leading to a potential fire hazard. On the other hand, if the cable is too large, it can be unnecessarily expensive and take up valuable space in your electrical system.
How to Calculate Cable Size
The correct cable size for an electrical system can be calculated using the following formula:
I = P / (U * η)
where:
- I is the current in Amperes (A)
- P is the power in Watts (W)
- U is the voltage in Volts (V)
- η is the efficiency factor
To use this formula, you will need to know the power and voltage of your electrical system. Once you have calculated the current, you can use the cable size chart to determine the appropriate cable size.
kW to Cable Size Chart
The kW to cable size chart provides a reference for the correct cable size based on the power of the electrical system. To use this chart, simply look up the power of your system in kilowatts (kW) and find the corresponding cable size.
| KW to cable size chart (Sqmm) with Amps | |||
| kW | Amps | Cable Size (AL) | Cable Size (Cu) |
| 0.11 | 0.19 | – | 1.5 |
| 0.26 | 0.45 | – | 1.5 |
| 0.37 | 0.64 | – | 2.5 |
| 0.55 | 0.96 | – | 2.5 |
| 0.75 | 1.30 | – | 2.5 |
| 1.1 | 1.91 | – | 2.5 |
| 1.5 | 2.61 | – | 2.5 |
| 2.2 | 3.83 | 4 | 2.5 |
| 3.7 | 6.43 | 6 | 2.5 |
| 5.5 | 9.56 | 10 | 2.5 |
| 7.5 | 13.04 | 10 | 4 |
| 9.3 | 16.17 | 10 | 4 |
| 11 | 19.13 | 16 | 4 |
| 15 | 26.09 | 25 | 6 |
| 18.5 | 32.17 | 35 | 10 |
| 22 | 38.26 | 50 | 25 |
| 30 | 52.17 | 70 | 35 |
| 37 | 64.35 | 95 | 50 |
| 45 | 78.26 | 120 | 50 |
| 75 | 130.43 | 150 | 70 |
| 90 | 156.52 | 185 | 95 |
| 110 | 191.30 | 240 | 120 |
| 132 | 229.56 | 300 | 120 |
| 150 | 260.86 | 400 | 150 |
| 175 | 304.34 | 500 | 185 |
| 220 | 382.59 | 500 | 240 |
| 250 | 434.76 | 630 | 300 |
| 280 | 486.94 | 2Rx240 | 300 |
| 310 | 539.11 | 2Rx300 | 400 |
Conclusion
In conclusion, the size of the cable is a crucial factor in ensuring the efficiency and safety of an electrical system. By using the formula and the kW to cable size chart provided in this article, you can determine the appropriate cable size for your electrical system. It is important to always use cables of the correct size to avoid potential fire hazards and ensure the efficient functioning of your electrical system.
