This app uses the calculation requirements found in the 2017 National Electrical Code to determine the ampacity of insulated conductors and certain cable-type wiring methods. This calculator also complies with the 2020 NEC requirements. Certain installations (such as cable trays and medium-voltage conductors) are not included in this app. Insulated single conductors are assumed to be installed in conduit or direct buried. All calculations assume a voltage of no more than 2000 volts and that the appropriate NEC requirements are followed by the installer, engineer or other responsible party. For more information on ampacity calculations, please consult our technical resources.
This app assumes installation in conduit or direct burial when individual insulated wire types are chosen. The app limits the final ampacity of the wire to the most conservative of: the corrected and adjusted ampacity; the equipment temperature limitation default values as described in NEC 110.14(C)(1); or the cable type temperature limitation.
Ac Cable Size Calculator
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Note: The calculator will permit choosing NM-B and UF-B up to 2 AWG. NM-B is permitted to be manufactured with conductors as large as 2 AWG, but multiconductor UF-B is limited to conductors no larger than 6 AWG by the UL standard.
NUMBER OF PARALLEL RUNS:
There are times when it is necessary or desired to run two or more conductors in parallel to carry the required current for a circuit. Paralleled conductors are permitted if sized at 1/0 AWG or larger. The number of parallel runs is the number of separate conductors installed within each phase, polarity, etc. There are several restrictions for the installation of paralleled conductors that can be found in NEC 310.10(H).
1. Choose your supply type (Single phase 230V / Three Phase 400V)
2. Choose your required voltage drop
3. Input the power in watts or current in amperes which you require your cable to carry
4. Input the length of your cable run
5. Choose the method of installation how the cable is going to be installed
6. Press calculate and your cable sizes will be calculated.
Our calculator now lists different cable types, so by scrolling down the list you are able to see how different cable types may have different sizes for the same set of parameters.
Choose a cable which is suitable for your installation.
The recommended cable sizes are based upon information provided by the user and are intended as a guide only. The calculation is derived from BS7671 Requirements for Electrical Installation, IEE Wiring Regulations, and is based on the voltage drop selected at 230 and 400 volts. In order for us to provide this information as a guide certain assumptions will have been made
The current carrying capacity tables for flexible cords in BS7671 do not include options for different installation methods, results have been included for flexible cords for the whole range of installation methods. It remains the responsibility of the user to ascertain where flexible cords are suitable.
We have combined flexible cords into one result for the use of our calculator (to make it more user friendly) please refer to BS7671 for individual tables and any relevant correction factors etc
I think we might need to add a help text to explain a few things though. Or we can improve/further extend the calculations to reflect changes from most of other fields, but that is a bit complicated as far as i tried.
I do have some thoughts for a more advanced cable sizer that i will try to implement probably for v8. But no promises, please keep an eye on GitLab for a related MR in order to try and offer an opinion when its time comes.
Lower value is more safe so, personally, i am good with this. But more important, you are also not allowed to size a conductor without some proper checks, and ampacity field has no impact there as far as i can tell. This calculator is really simple ATM.
Insulation: Select the insulation for the cables. For multi-core cables, this applies to the live, neutral and earth conductors. For single-core cables, this applies to the live and neutral conductors. The earth-cable select is selected under Earth Cable Insulation.
This option enables you to use parallel cables in high-current installations, where more than one multi-core cable or more than one single-core cable group is required. This means more than one live core per phase.
For single-core applications. The whole cable group is counted as one. A cable group includes three phase cables, the neutral cable, and the earth cable. It can be installed in a flat or trefoil formation.
Number of cables, cable groups, or enclosures: This is required when multiple cables are installed close to each other, where the heat radiated from adjacent cables affects the current rating. It includes parallel multi-core cables and parallel single-core cable groups. For parallel multi-core cables, each cable is considered in the derating. For parallel single-core cable groups, each cable group is considered in the derating -not the individual cables for each phase or the neutral.
Space between cables, cable groups or enclosures: Select the spacing between multi-core cables, single-core cable groups or enclosures (underground multi- and single-core). The table below shows the spacing that can be selected for different installations and cable types.
Check loop impedance: Select to check the earth loop impedance of the circuit. In other words, to check if the specified protection device will trip for an earth fault when the specified cable is used.
The external source impedance is estimated, calculated or specified (measured). The method depends on the selected protection device. When it is calculated, it is calculated from the prospective earth fault current.
The fault constant, K, is based on the insulation material, the initial conductor temperature, and the final conductor temperature. The calculator uses the maximum allowable operating temperature as the initial conductor temperature. For example, 75C is used for PVC insulated cables, 90C is used for XLPE insulated cables, and 110C is for XLPE 110C.
We think this tool will be helpful to personnel of all skill levels to quickly perform calculations and eliminate many unsuitable choices. The final decision on wire and circuit protection should come after a review based on additional sources, such as the ABYC standards or one of the many books in the field.
All marine electrical systems present a risk of fire and other hazards. Blue Sea Systems makes no representation or warranty that this calculator will be suitable to address your particular situation or requirements.
This calculator does not account for all possible variables and factors relevant to the selection of wire size and circuit protection. Such variables may include overloads (such as changing the size of light bulbs or adding additional loads to circuits), wiring errors (such as loose connections or poor crimps), heated terminations (such as motor terminals, heating appliances, or lighting fixtures), data input errors, unusual environmental heat sources, and inadequate or defective wire insulation, software defects, and/or malfunctions of a browser or server computer.
This calculator is not a substitute for the expertise of a marine electrical professional. Under no circumstances should this calculator be used as the sole basis for selecting wire size or circuit protection. Any wire size or circuit protection tentatively selected with this tool should be reviewed for adequacy, before installation, by a professional applying the applicable industry standards.
All cables will have some amount of voltage drop due to the resistance of the cable itself. Copper's resistance is very low but it isn't zero. For a given cable size, voltage drop will increase as current increases. Here are some guidelines for how to determine acceptable voltage drop for maximum efficiency:
In some situations this may be necessary to compromise on voltage drop due to mechanical considerations. For example, if 1 or 2 AWG cable simply won't fit in the space available, going with a 5% voltage drop for the start battery and ground connections of your DC-DC charger in order to use 4 AWG cable is fine. The charger will still work normally, just slightly less efficiently. Solar is an exception as that application is partularly sensitive to voltage drop - keep that at or below 2%.
Temperatures near the engine can easily exceed 160-180F (70-80C). If your cable will be under the hood be sure to adjust the temperature slider to account for that. For wiring within the interior of the vehicle also keep in mind that temperatures inside parked vehicles can also get quite high.
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