kVA ToolsBETA — Cable Scout
|
|
|
Input
| Load & System | Design Method | |
| System Type | ||
| System Voltage (V) | ||
| Design Load Current IB (A) | ||
| Power Factor (for ΔV) | ||
| OCPD Rating In (A) | ||
| Cable & Installation | Conductor Material | |
| Insulation Type | ||
| Installation Method | ||
| Loaded Phase Conductors |
IEC Annex E neutral loading rules
will be applied when THDi > 15%.
|
|
| Ambient & Soil | Ambient Air Temp. |
|
| Ambient Ground Temp. |
Used mainly for buried/ducted
methods (D1/D2).
|
|
| Soil Thermal Resistivity (K·m/W) |
Typical values: 1.0–2.5 K·m/W. IEC
base is often 2.5.
|
|
| Number of Circuits Grouped |
Grouping factor fgroup is
applied if > 1.
|
|
| Harmonics & Voltage Drop | THDi (%) |
Use THDi3n (triplen-only) if known;
apply THDi if THDi3n unknown (Annex
E footnote). Derating per Eq.
E.52.7.
|
| Circuit Length |
|
|
| Voltage Drop Limit |
IEC cl. 525 / Annex G Table G.52.1:
3% lighting, 5% other uses. A volt
limit is referenced to the nominal
system voltage.
|
|
| Short Circuit | Fault Current at Cable (kA) | |
| Fault Duration |
|
|
| k-factor Override (optional) |
If blank, a typical k value is used
for the material/insulation.
|
Output — Results
| Item | Value | Units |
|---|---|---|
| Phase Conductor Size | — | mm² |
| Neutral Size | — | mm² |
| Table Ampacity Itab | — | A |
| Derated Ampacity IZ | — | A |
| IZ / IB Margin | — | — |
| OCPD Coordination | — | — |
| Voltage Drop | — | V |
| Voltage Drop | — | % |
| Short-Circuit Required Size | — | mm² |
| Short-Circuit Check | — | — |
Output — System Factors
| Factor | Value | Comment |
|---|---|---|
| Temperature Factor ftemp | — | Ambient vs rated temp |
| Soil Factor fsoil | — | Soil resistivity vs reference |
| Grouping Factor fgroup | — | Number of circuits grouped |
| Harmonic Factor fharm | — | Neutral loading due to harmonics |
| Total Factor ftotal | — | ftemp × fsoil × fgroup × fharm |
| Ampacity Check | — | IZ vs IB |
| Voltage Drop Check | — | ΔV vs design limit |
IEC 60364 Note: —
Output — Parameter Status
| Category | Status |
|---|---|
| Input Validation | — |
| Harmonics & Neutral Loading | — |
| Grouping Effects | — |
| Implementation Notes | Table-based ampacity model with representative IEC values. For critical applications, verify against manufacturer-specific cable data and applicable national standards. |