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built templatecable-sizingwith-tool

Cable Ampacity

Computes the derated current-carrying capacity of power cables by applying temperature and grouping correction factors to tabulated base ampacity values: I_derated = I_base * Ct * Cg, where Ct = sqrt((T_max - T_amb) / (T_max - T_ref)). Covers XLPE and PVC insulation across buried, tray, conduit, and air installations per AS/NZS 3008.1.1 and IEC 60287.

inputs

6 fields

context

4 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

6 inputs to 4 scored outputs

  • conductor_size_mm2

    enum

    Cable conductor cross-sectional area

    1.52.54610162535+7

  • insulation_type

    enumfrom archetypehidden in hard

    Cable insulation material

    XLPEPVC

  • installation_method

    enumfrom archetypehidden in hard

    Cable installation method

    buriedin-trayin-conduitin-air

  • ambient_temp_c

    float

    Ambient temperature at the cable location

    10 to 60°C

  • max_conductor_temp_c

    float

    Maximum allowable conductor temperature for the insulation type

    60 to 90°C

  • grouping_circuits

    int

    Number of circuits grouped together

    1 to 12circuits
base_ampacity_atol 0.03

Base current-carrying capacity from tables (A)

temp_derating_factortol 0.03

Temperature derating factor Ct

grouping_derating_factortol 0.03

Grouping derating factor Cg

derated_ampacity_atol 0.03

Final derated cable ampacity (A)

visibility contract

Difficulty Ladder

all_giveneasy

Single circuit with standard ambient temperature, all params given

all fields visible
all_givenmedium

Multiple circuits with various installation methods, all params given

all fields visible
partialhard

Installation method and insulation type hidden; agent must infer from context

insulation_typeinstallation_method

scenario bands

Archetype Atlas

residential_circuit

3 contexts

Residential wiring circuit in temperate climate

ambient_temp_c25 to 35
grouping_circuits1 to 3

sydney-suburban / melbourne-suburban / adelaide-suburban

commercial_building

3 contexts

Commercial building distribution circuit using XLPE cables on cable tray

ambient_temp_c30 to 40
grouping_circuits2 to 6
insulation_typeXLPE
installation_methodin-tray

sydney-cbd / melbourne-cbd / brisbane-cbd

industrial_plant

3 contexts

Industrial plant feeder cable in warm environment using PVC cables in underground conduit

ambient_temp_c35 to 50
grouping_circuits3 to 9
insulation_typePVC
installation_methodin-conduit

hunter-valley-industrial / perth-industrial / gladstone-industrial

underground_distribution

3 contexts

Underground cable installation in direct-buried duct

ambient_temp_c20 to 30
grouping_circuits1 to 4

darwin-tropical / cairns-tropical / townsville-coastal

rendered task

Generation Preview

sydney-cbd-commercial-building-preview

difficulty
hard
visibility
partial
archetype
commercial_building
site context
sydney-cbd
instruction excerptcable-ampacity_calc.py

visible fields

  • conductor_size_mm21.5 mm²
  • ambient_temp_c30 to 40 °C
  • max_conductor_temp_c90 °C
  • grouping_circuits2 to 6 circuits

withheld schema

insulation_typeinstallation_methodbase_ampacity_atemp_derating_factorgrouping_derating_factorderated_ampacity_a
Commercial building distribution circuit using XLPE cables on cable tray. sydney-cbd. Required outputs: base_ampacity_a, temp_derating_factor, grouping_derating_factor, derated_ampacity_a