Cable Size Calculator
DESCRIPTION
An easy to use cable calculator for calculating the minimum required cable sizes for various cable types, protective devices, installation methods and correction factors. This cable sizing software also calculates voltage drop, R1+R2 and Ze, based on BS 7671 the UK IET wiring regulations
Do you ever need to carry out a quick on-site cable size calculation? If so, this is where this cable calculator becomes handy, a pocket sized cable calculator app for your mobile device.
Makes cable sizing easy in two simple steps, with instant results!
Features
- Cable Sizing Calculator
- Maximum Zs
- Voltage Drop Calculation
- Tabulated Current (It)
- Expected Zs
- Print or Save The Results
- Expected R1+R2
- Digitally Sign & Approve
The Ultimate Cable Size Calculator
Unleashing the power of precision, our Electrical Cable Size Calculator is a game-changer for industry professionals. This essential tool provides a seamless way to determine the ideal cable size for any electrical project, ensuring efficiency and safety. With its user-friendly interface, navigating complex calculations has never been easier. Whether you’re a seasoned electrician or a novice DIY enthusiast, this calculator simplifies the process, allowing you to make informed decisions with confidence.
Utilizing advanced formulas, our cable calculator considers various factors such as voltage drop, current, and maximum Zs values, delivering results in seconds. Say goodbye to guesswork and hello to accuracy. Empower your projects with the right cable size, saving time, money, and potential headaches down the line. From residential wiring to large-scale industrial installations, this tool is a must-have in your arsenal. Embrace the future of electrical design and installation with our Electrical Cable Size Calculator and take the headache out of cable sizing.
App Reviews
Don’t take our word for it – here’s what some cable calc app users say,
Been using it for about a month now and it’s been brilliant. Best cable calc I’ve found by far.
Cable Size Calculations
Cable Sizing Calculator
Carry out instant cable sizing calculations for, condition reports, circuit design and cable sizing on the go. This cable sizing calculator has been designed to make it as easy as possible to calculate a cable size (in two simple steps).
STEP 1:
Input your circuit design parameters:
- Design Current
- Length of Circuit
- Supply Voltage
- Source Ze or Zdb
Select your design options:
- Voltage Drop %
- Earthing Type
- Protective Device Type
- Device Rating
- Cable Type
- Max Disconnection Time
Correction Factors
Correction Factors for Cable Sizing
In step 2 we apply and relevant correction factors. For BS 3036 fuses a correction factor is automatically applied if a BS 3036 protective device is selected.
STEP 2:
Select from the available options:
- Installation Method
- Ambient Temperature
- Grouping
- Surrounded by Thermal Insulation
Then tap the calculate button to display the results.
CORRECTION FACTORS:
- Cg : Grouping
- Ca : Ambient air temperature
- Ca : Ambient ground temperature
- Ci : Thermal insulation
- Cc : BS 3036 semi-enclosed fuse
Resulting Cable Size
Cable Size Calculation Results
The cable sizing calculation results screen displays your circuit design data, selected options, cable size and other related calculation results.
Cable Size Calculations:
- It : Tabulated current
- R1+R2 : Circuit expected R1+R2 value
- Zs : Circuit expected Zs value
- Max Zs : Calculated max Zs values for 0.2s, 0.4s & 5s (80% + 100% values)
- Vd : Calculated voltage drop %
- CF : Total applied correction factor value
- Minimum required cable size (mm²)
Saves Time
QUICK AND EASY CABLE CALCS
Calculating cable sizes need not be daunting, let the cable calc app do it for you.
Other Features
✔ Print cable calculator results
✔ Verification and validation checks
✔ Support for manufacturer specific MCCB’s & ACB’s (max Zs)
✔ Support for RCD’s in TT Earthing Systems
- Quick and easy
- Saves time
- Print the results
- Digitally sign
FAQ's
FREQUENTLY ASKED QUESTIONS
What are correction factors?
Correction factors are multipliers applied to cable sizing calculations for specific circumstances.
Correction factors include:
- Cg Grouping
- Ca Ambient air temperature
- Ca Ambient ground temperature
- Ci Thermal insulation
- Cc BS 3036 semi-enclosed fuses
What is Zdb?
Zdb (ZDB) is the term generally used to refer to the earth loop impedance at a distribution board.
What is design current?
The circuit design current is the minimum amount of current the circuit needs to be able to sustain in normal use.
To calculate the design current or maximum demand check out our Diversity / Maximum Demand Calculator App.
What is Voltage drop?
Voltage drop is the amount of volts lost due to the resistance of a cable, the longer the cable is the higher the volt drop will be.
This is also true for varying cable sizes, the smaller the cable the higher the voltage drop will be, hence for long circuits a larger cable might be required to satisfy the maximum permitted voltage drop.
Volt Drop Calculation
VOLTAGE DROP CALCULATOR
This cable calculator will also calculate and apply a voltage drop calculation as part of the cable sizing calculation process. Volt drop is generally measured in mV (millivolts) or as a percent (%), 1 millivolt is one thousandth of a volt.
If a cable calculation fails the Volt drop maximum but passes all other requirements such as Max Zs, Current Carrying Capacity etc. then you will be prompted with a message “Volt Drop Compliance Failed, try next cable size up?” to select the next larger cable size to then try the full calculation again until all of the requirements are met before selecting the most suitable cable size.
If you only need to carry out a Voltage Drop Calculation and not a Cable Size Calculation you can use our free Voltage Drop Calculator.
Cable Calc
iOS | Android | Web
- Save the calculation results as a PDF
- Includes correction factors
- Includes various installation methods
- Cable Sizes in mm²