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electricalwith-tool

Mechanical Load Feeder Voltage Package

Calculates source-bound electrical feeder metrics from a deterministic SSC-05 task-owned source pack. The template combines mechanical equipment demand, future allowance, power-factor correction, three-phase feeder current, cable ampacity derating, breaker continuous loading, voltage drop, and an overall synthetic pass score.

with-tool: The model is given an executable Python calculator script.

Standards

AS/NZS 3008.1.1-style cable ampacity workflowETAP-style load-flow workflowEasyPower one-line and PowerFlow workflowSKM PowerTools-style coordination workflow

Tags

ampacitybreakerdeterministicelectricalfeederload-schedulepower-factorsldvoltage-drop

How this task is generated

One template produces many comparable benchmark tasks while keeping the scoring contract fixed.

  1. 01

    Template

    The reusable contract shown on this page.

  2. 02

    Scenario

    An archetype and site context are sampled.

  3. 03

    Difficulty tier

    Inputs may be hidden at harder tiers.

  4. 04

    Task prompt

    The model responds with the declared outputs.

Parameters

Inputs the model receives, and the outputs it is scored on.

Inputs

23 inputs

Always given

Included directly in every task prompt.

23
Show 23 inputs

  • Pump motor

    pump_motor_kw

    LOAD-05-MECH-SCHED-01 chilled-water pump motor rating

    22 kW

  • Pump quantity

    pump_quantity

    LOAD-05-MECH-SCHED-01 chilled-water pump quantity

    2

  • Pump demand factor

    pump_demand_factor

    LOAD-05-MECH-SCHED-01 chilled-water pump demand factor

    0.65

  • Ahu motor

    ahu_motor_kw

    LOAD-05-MECH-SCHED-01 AHU motor rating

    11 kW

  • Ahu quantity

    ahu_quantity

    LOAD-05-MECH-SCHED-01 AHU quantity

    1

  • Ahu demand factor

    ahu_demand_factor

    LOAD-05-MECH-SCHED-01 AHU demand factor

    1

  • Dosing pump

    dosing_pump_kw

    LOAD-05-MECH-SCHED-01 dosing pump motor rating

    2.4 kW

  • Dosing quantity

    dosing_quantity

    LOAD-05-MECH-SCHED-01 dosing pump quantity

    2

  • Dosing demand factor

    dosing_demand_factor

    LOAD-05-MECH-SCHED-01 dosing pump demand factor

    0.8

  • Future allowance pct

    future_allowance_pct

    LOAD-05-CALC-01 future allowance applied to demand load

    15 %

  • Initial power factor

    initial_power_factor

    LOAD-05-CALC-01 uncorrected power factor

    0.82

  • Target power factor

    target_power_factor

    LOAD-05-CALC-01 target corrected power factor

    0.93

  • Selected capacitor

    selected_capacitor_kvar

    LOAD-05-CALC-01 selected capacitor bank size

    20 kVAr

  • Feeder voltage

    feeder_voltage_v

    FEEDER-05-MCC-01 nominal three-phase feeder voltage

    415 V

  • Feeder length

    feeder_length_m

    CABLE-05-FDR-01 route length from MSB-05 to MCC-05

    145 m

  • Feeder voltage drop mv per a m

    feeder_voltage_drop_mv_per_a_m

    CABLE-05-FDR-01 source-owned voltage-drop factor

    1.6 mV/A/m

  • Base cable ampacity

    base_cable_ampacity_a

    CABLE-05-FDR-01 base cable ampacity before derating

    140 A

  • Ambient derating factor

    ambient_derating_factor

    CABLE-05-FDR-01 ambient temperature derating factor

    0.94

  • Grouping derating factor

    grouping_derating_factor

    CABLE-05-FDR-01 grouping derating factor

    0.85

  • Installation derating factor

    installation_derating_factor

    CABLE-05-FDR-01 installation derating factor

    0.96

  • Breaker trip

    breaker_trip_a

    PROT-05-BKR-01 breaker trip rating

    100 A

  • Breaker continuous factor

    breaker_continuous_factor

    PROT-05-BKR-01 continuous loading factor

    0.8

  • Max voltage drop percent

    max_voltage_drop_percent

    CRIT-05-VDROP-01 owner maximum feeder voltage drop

    5 %

Scored outputs

17 outputs

Connected load

connected_load_kw

Connected mechanical load from LOAD-05-MECH-SCHED-01

Scores if within ±3% of the reference value.

Demand load

demand_load_kw

Demand load after source-owned demand factors

Scores if within ±3% of the reference value.

Future allowance

future_allowance_kw

Future allowance applied to the demand load

Scores if within ±3% of the reference value.

Design load

design_load_kw

Demand load plus future allowance

Scores if within ±3% of the reference value.

Initial reactive power kvar

initial_reactive_power_kvar

Reactive power before power-factor correction

Scores if within ±3% of the reference value.

Required capacitor kvar

required_capacitor_kvar

Capacitor kVAr required to reach the target power factor

Scores if within ±3% of the reference value.

Selected capacitor margin kvar

selected_capacitor_margin_kvar

Selected capacitor size minus required capacitor kVAr

Scores if within ±3% of the reference value.

Corrected apparent power kva

corrected_apparent_power_kva

Apparent power after correction to the target power factor

Scores if within ±3% of the reference value.

Feeder current

feeder_current_a

FEEDER-05-MCC-01 three-phase current after power-factor correction

Scores if within ±3% of the reference value.

Derated cable ampacity

derated_cable_ampacity_a

CABLE-05-FDR-01 ampacity after source-owned derating factors

Scores if within ±3% of the reference value.

Ampacity margin

ampacity_margin_a

Derated cable ampacity minus feeder current

Scores if within ±3% of the reference value.

Breaker allowable current

breaker_allowable_current_a

PROT-05-BKR-01 continuous allowable current

Scores if within ±3% of the reference value.

Breaker margin

breaker_margin_a

Breaker continuous allowable current minus feeder current

Scores if within ±3% of the reference value.

Voltage drop

voltage_drop_v

FEEDER-05-MCC-01 source-owned voltage drop

Scores if within ±3% of the reference value.

Feeder voltage drop

feeder_voltage_drop_percent

FEEDER-05-MCC-01 voltage drop percentage

Scores if within ±3% of the reference value.

Voltage drop margin

voltage_drop_margin_percent

Owner maximum voltage drop minus calculated feeder voltage drop

Scores if within ±3% of the reference value.

Overall pass score

overall_pass_score

1.0 when PFC, ampacity, breaker, and voltage-drop margins are non-negative

Scores if within ±0.1% of the reference value.

Difficulty

Each template is sampled at three tiers. Harder tiers may hide inputs, forcing the model to infer them from the scenario description.

All inputs remain visible at every tier

For this template, difficulty scales through parameter and scenario ranges rather than hidden information.

easy:
All source-pack values given for the SSC-05 mechanical-load feeder package
medium:
All source-pack values given for the SSC-05 mechanical-load feeder package
hard:
All source-pack values given for the SSC-05 mechanical-load feeder package

Task bundle

The exact instruction and parameter contract used to generate this task, pinned to the published library source.

/workspace

  • instruction.md
  • mechanical-load-feeder-voltage-package_calc.py

Teal lines show Jinja input conditions, not task visibility policy. A line renders only when that input or tool is visible.

1You are an electrical design engineer checking a task-owned synthetic SSC-05 mechanical-load feeder, power-factor, ampacity, breaker, and voltage-drop package.2 3Use only the task-owned synthetic source pack values shown below for numeric grading. ETAP, EasyPower, SKM PowerTools, and AS/NZS 3008.1.1-style workflows shape the context only; this instance does not run those tools or parse a real one-line, cable schedule, protection curve, or load-flow export.4 5## Scene6 7- Feeder design case: `CASE-SSC05-FEEDER-001`8- Mechanical load schedule: `LOAD-05-MECH-SCHED-01`9- Load calculation table: `LOAD-05-CALC-01`10- Single-line diagram: `SLD-05-MCC-01`11- Upstream switchboard: `SWBD-05-MSB-01`12- Mechanical control centre: `MCC-05`13- Feeder: `FEEDER-05-MCC-01`14- Cable schedule row: `CABLE-05-FDR-01`15- Protective device row: `PROT-05-BKR-01`16- Voltage-drop criterion: `CRIT-05-VDROP-01`17- Electrical design memo: `MEMO-05-ELEC-LOAD-01`18 19## Mechanical Load And Power-Factor Basis20 21| Item | Value |22|------|-------|23| Chilled-water pump motor rating | {{ pump_motor_kw }} kW |24| Chilled-water pump quantity | {{ pump_quantity }} |25| Chilled-water pump demand factor | {{ pump_demand_factor }} |26| AHU motor rating | {{ ahu_motor_kw }} kW |27| AHU quantity | {{ ahu_quantity }} |28| AHU demand factor | {{ ahu_demand_factor }} |29| Dosing pump motor rating | {{ dosing_pump_kw }} kW |30| Dosing pump quantity | {{ dosing_quantity }} |31| Dosing pump demand factor | {{ dosing_demand_factor }} |32| Future allowance | {{ future_allowance_pct }} % |33| Initial power factor | {{ initial_power_factor }} |34| Target power factor | {{ target_power_factor }} |35| Selected capacitor bank | {{ selected_capacitor_kvar }} kVAr |36 37Load and power-factor checks:38 39- Connected load equals the sum of each equipment rating times its quantity.40- Demand load equals each connected equipment load times its source-owned demand factor, summed across the schedule.41- Future allowance equals `demand_load_kw x future_allowance_pct / 100`.42- Design load equals demand load plus future allowance.43- Initial reactive power equals `design_load_kw x tan(acos(initial_power_factor))`.44- Target reactive power equals `design_load_kw x tan(acos(target_power_factor))`.45- Required capacitor kVAr equals initial reactive power minus target reactive power.46- Selected capacitor margin equals selected capacitor bank minus required capacitor kVAr.47- Corrected apparent power equals `design_load_kw / target_power_factor`.48 49## Feeder, Cable, Breaker, And Voltage-Drop Basis50 51| Item | Value |52|------|-------|53| Feeder voltage | {{ feeder_voltage_v }} V |54| Feeder length | {{ feeder_length_m }} m |55| Voltage-drop factor | {{ feeder_voltage_drop_mv_per_a_m }} mV/A/m |56| Base cable ampacity | {{ base_cable_ampacity_a }} A |57| Ambient derating factor | {{ ambient_derating_factor }} |58| Grouping derating factor | {{ grouping_derating_factor }} |59| Installation derating factor | {{ installation_derating_factor }} |60| Breaker trip rating | {{ breaker_trip_a }} A |61| Breaker continuous factor | {{ breaker_continuous_factor }} |62| Maximum voltage drop | {{ max_voltage_drop_percent }} % |63 64Feeder checks:65 66- Feeder current equals `corrected_apparent_power_kva x 1000 / (sqrt(3) x feeder_voltage_v)`.67- Derated cable ampacity equals `base_cable_ampacity_a x ambient_derating_factor x grouping_derating_factor x installation_derating_factor`.68- Ampacity margin equals derated cable ampacity minus feeder current.69- Breaker allowable current equals `breaker_trip_a x breaker_continuous_factor`.70- Breaker margin equals breaker allowable current minus feeder current.71- Voltage drop in volts equals `feeder_voltage_drop_mv_per_a_m x feeder_current_a x feeder_length_m / 1000`.72- Feeder voltage drop percent equals `voltage_drop_v / feeder_voltage_v x 100`.73- Voltage-drop margin equals maximum voltage drop percent minus feeder voltage drop percent.74- Overall pass score is `1.0` only when selected capacitor margin, ampacity margin, breaker margin, and voltage-drop margin are all non-negative; otherwise it is `0.0`.75 76## Output Format77 78Write a compact memo to `/workspace/output.md`. Include a source-boundary statement that this is a task-owned synthetic source pack. Explain the calculations briefly, preserve the object IDs above, and state whether the baseline source pack passes the current docs-only checks.79 80Do not claim authority approval, accepted project evidence, software export validity, full standards compliance, executable real source-pack parsing, generated ETAP/EasyPower/SKM evidence, generated benchmark readiness, or benchmark readiness.81 82Include a fenced JSON block with exactly these numeric keys:83 84```json85{86 "connected_load_kw": <numeric_value>,87 "demand_load_kw": <numeric_value>,88 "future_allowance_kw": <numeric_value>,89 "design_load_kw": <numeric_value>,90 "initial_reactive_power_kvar": <numeric_value>,91 "required_capacitor_kvar": <numeric_value>,92 "selected_capacitor_margin_kvar": <numeric_value>,93 "corrected_apparent_power_kva": <numeric_value>,94 "feeder_current_a": <numeric_value>,95 "derated_cable_ampacity_a": <numeric_value>,96 "ampacity_margin_a": <numeric_value>,97 "breaker_allowable_current_a": <numeric_value>,98 "breaker_margin_a": <numeric_value>,99 "voltage_drop_v": <numeric_value>,100 "feeder_voltage_drop_percent": <numeric_value>,101 "voltage_drop_margin_percent": <numeric_value>,102 "overall_pass_score": <numeric_value>103}104```105

Scenario archetypes

Each generated task is drawn from one of these realistic scenario bands.

Site contexts ground each scenario in a real locale the model can use to infer hidden values.

Ssc05 mechanical feeder case

ssc05_mechanical_feeder_case

Mechanical load schedule tied to one SLD feeder, cable, breaker, voltage-drop criterion, and electrical memo

mechanical-load-feeder-voltage
Parameter ranges
pump_motor_kw
22
pump_quantity
2
pump_demand_factor
0.65
ahu_motor_kw
11
ahu_quantity
1
ahu_demand_factor
1
dosing_pump_kw
2.4
dosing_quantity
2
dosing_demand_factor
0.8
future_allowance_pct
15
initial_power_factor
0.82
target_power_factor
0.93
selected_capacitor_kvar
20
feeder_voltage_v
415
feeder_length_m
145
feeder_voltage_drop_mv_per_a_m
1.6
base_cable_ampacity_a
140
ambient_derating_factor
0.94
grouping_derating_factor
0.85
installation_derating_factor
0.96
breaker_trip_a
100
breaker_continuous_factor
0.8
max_voltage_drop_percent
5

Example task

mechanical-load-feeder-voltage-ssc05-mechanical-feeder-case-preview — hard difficulty, all inputs given.

Mechanical load schedule tied to one SLD feeder, cable, breaker, voltage-drop criterion, and electrical memo. mechanical-load-feeder-voltage. Required outputs: connected_load_kw, demand_load_kw, future_allowance_kw, design_load_kw, initial_reactive_power_kvar, required_capacitor_kvar

The model sees

Scenario context and visible inputs.

pump_motor_kw
22 to 22 kW
pump_quantity
2 to 2
pump_demand_factor
0.65 to 0.65
ahu_motor_kw
11 to 11 kW
ahu_quantity
1 to 1
ahu_demand_factor
1 to 1
dosing_pump_kw
2.4 to 2.4 kW
dosing_quantity
2 to 2
dosing_demand_factor
0.8 to 0.8
future_allowance_pct
15 to 15 %
initial_power_factor
0.82 to 0.82
target_power_factor
0.93 to 0.93
selected_capacitor_kvar
20 to 20 kVAr
feeder_voltage_v
415 to 415 V
feeder_length_m
145 to 145 m
feeder_voltage_drop_mv_per_a_m
1.6 to 1.6 mV/A/m
base_cable_ampacity_a
140 to 140 A
ambient_derating_factor
0.94 to 0.94
grouping_derating_factor
0.85 to 0.85
installation_derating_factor
0.96 to 0.96
breaker_trip_a
100 to 100 A
breaker_continuous_factor
0.8 to 0.8
max_voltage_drop_percent
5 to 5 %

Executable tool: mechanical-load-feeder-voltage-package_calc.py

The model must infer

Inputs withheld at this difficulty.

Nothing. All inputs are supplied.

The model must produce

The scored JSON answer schema.

{
  "connected_load_kw": <number>,
  "demand_load_kw": <number>,
  "future_allowance_kw": <number>,
  "design_load_kw": <number>,
  "initial_reactive_power_kvar": <number>,
  "required_capacitor_kvar": <number>,
  "selected_capacitor_margin_kvar": <number>,
  "corrected_apparent_power_kva": <number>,
  "feeder_current_a": <number>,
  "derated_cable_ampacity_a": <number>,
  "ampacity_margin_a": <number>,
  "breaker_allowable_current_a": <number>,
  "breaker_margin_a": <number>,
  "voltage_drop_v": <number>,
  "feeder_voltage_drop_percent": <number>,
  "voltage_drop_margin_percent": <number>,
  "overall_pass_score": <number>
}
  • connected_load_kw · scored within ±3%
  • demand_load_kw · scored within ±3%
  • future_allowance_kw · scored within ±3%
  • design_load_kw · scored within ±3%
  • initial_reactive_power_kvar · scored within ±3%
  • required_capacitor_kvar · scored within ±3%
  • selected_capacitor_margin_kvar · scored within ±3%
  • corrected_apparent_power_kva · scored within ±3%
  • feeder_current_a · scored within ±3%
  • derated_cable_ampacity_a · scored within ±3%
  • ampacity_margin_a · scored within ±3%
  • breaker_allowable_current_a · scored within ±3%
  • breaker_margin_a · scored within ±3%
  • voltage_drop_v · scored within ±3%
  • feeder_voltage_drop_percent · scored within ±3%
  • voltage_drop_margin_percent · scored within ±3%
  • overall_pass_score · scored within ±0.1%