Cable Sizing Calalculator

Voltage (V):

Voltage Drop (%):

Load Current (A):

pf:

Ambient Temperature (°C):

Short Circuit (kA):

pf:

time (s):

No.Circuits/Cables:

Simultaneous Overload

Parallel Cables:

Ignore Group Derating

Cable Length (m):

Soil Thermal Resistivy (K.m/W):

- only for buried cables

Insulation Thickness (mm):

- if in thermal insulation

Tip: registered users can save calculations.

Save cables by project. More sizing methods. More reports.
BS7671, ERA 69-30, IEC 60502. Low voltage to 33kV.
Easy to use. Desktop, tablet or mobile.
Try myCableEngineering.com

Important Notice

We have created a brand new cable engineering web application. The application significantly expands on the current calculation, allowing you to manage all your project cables across all your devices.

You can visit the new site at - myCableEngineering.com.

We will soon be discontinuing the existing myElectrical.com cable sizing calculation and concentrating our efforts on myCableEngineering.com.

Calculation Notes

Cable sizing compiles with:
- BS 7671:2008, IEE Wiring Regulations 17th Edition
- IEC 60364:2001

Cable size is selected as follows:
  1. Cable is calculated on current capacity
  2. Voltage drop is calculated (and cable size increased if necessary)
  3. Fault level withstand is calculated (and cable size increased if necessary)

Tip: if you don't want fault level to be considered, you can set it to a very low value.

To find out more about how the cable sizing tool works, please see:
- Cable Sizing Tool - Notes Post

Resources

CPC Sizing

To select or size Circuit Protective Conductors (CPC ), please use our:
- Circuit Protective Conductor Sizing Tool

Metric AWG Conversion

To convert between Metric and American Wire Gauge, you can use our:
- Metric AWG Conversion Table

Cable Sizing Calalculator

Cable Size Calculation

Installation Methods

Cable Parameters

Important Notice

Calculation Notes

Resources

CPC Sizing

Metric AWG Conversion

Latest Questions: