Last Source Alignment Verification: April 17, 2026
Source Alignment & Citations 2026
Mapping TradeHub workflow logic to published NFPA, ACCA, and ICC standards for field-use reference alignment.
Source Navigation Index
TradeHub Source Alignment Quick Map
This index provides structured access to the master reference table and tool-specific source alignment records, with methodology and verification framework documented separately.
Select a source alignment record below to jump to its corresponding section.
Suite Navigation
Residential Load Calculator
NEC optional-method service sizing and panel-capacity alignment record.
Breaker & Panel Load Calculator
Breaker sizing, continuous-load adjustment, and standard OCPD alignment record.
Voltage Drop Calculator
Conductor performance, drop-percent screening, and field-use voltage-drop alignment record.
Conduit Fill Calculator
Raceway fill, grouped conductor review, and NEC Chapter 9 source alignment record.
HVAC BTU Load Calculator
Manual J-style thermal baseline and HVAC sizing alignment record.
Manual S Equipment Selection Calculator
Expanded performance, capacity screening, and Manual D bridge alignment record.
Manual D Duct Design Calculator
Pressure-budget, friction-rate, and duct-path alignment record.
No live plumbing source-alignment records are published yet.
No live structural or roofing source-alignment records are published yet.
Purpose
This index organizes the source ledger and active source alignment records, with methodology and verification framework maintained separately.
Engineering Manifesto
Technical Methodology & Framework
This ledger documents source alignment across active TradeHub workflow pages. To review the broader methodology, data handling posture, and verification approach, use the methodology page.
| Reference Category | Source Data Mapping | Code Edition | Source Verified |
|---|---|---|---|
| Electrical (Load/Conduit) |
NFPA 70: National Electrical Code®
Articles 220.82 & 120.82 · Chapter 9 Tables 1, 4 & 5
|
2017
2020
2023
2026 READY
|
Mar 29, 2026 |
| Mechanical (ACCA/Manual J/S/D) |
ACCA / ANSI Technical Manuals
Manual D: Section 12 (ASP)
Manual D: Section N (Altitude)
Manual D: Section 3 (Blower)
Manual J (Thermal)
Manual S (Equip)
|
ANSI/ACCA 2 (V3) & 1 (V3) | Mar 29, 2026 |
| Plumbing (IPC/IFGC) |
ICC International Codes
Sewer Slope (DFU) & Gas Pipe Sizing
|
2024 Edition | Mar 29, 2026 |
| Structural (ASCE-7/IRC 9) |
ASCE-7 Minimum Design Loads
Beam Span & Roof Pitch Assemblies (IRC Ch. 9)
|
2024 IRC / ASCE 7-22 | Mar 29, 2026 |
Residential: Electrical Source Alignment Record
Residential Load Calculator · Source Alignment Snapshot
This section defines how the Residential Load Calculator aligns with NEC optional-method service sizing, including demand factor application, load aggregation logic, and panel capacity evaluation workflows.
Primary Standards Basis
NFPA 70 Optional-Method Dwelling Load Workflow
The live residential load engine is aligned to NEC optional-method demand logic for single-family dwelling service sizing, panel-capacity review, and field-facing load schedule support.
Current source family
NFPA 70® Articles 220.82 and 120.82, with TradeHub handling year-specific optional-method differences across supported code cycles.
Mapped Logic Scope
Residential scope of alignment
Load basis
General lighting, small-appliance and laundry demand, fixed-appliance handling, and optional-method diversity application.
Major equipment
Range, dryer, tankless water-heater treatment, continuous-load handling, and equipment-side nameplate review.
HVAC and EV
HVAC demand comparison, heat-pump auxiliary treatment, EV charger inclusion, and panel-capacity benchmarking.
Field outputs
Required amps, recommended service size, shareable result links, and professional load schedule/report workflows.
Reference Defaults Posture
The tool uses bounded workflow assumptions such as required branch-circuit baselines and year-specific demand logic where the NEC optional method prescribes them. User-entered nameplate data still controls when supplied.
Verification Posture
This engine is maintained as a live source-aligned tool for residential service sizing review, with output logic aligned to published optional-method pathways and trade-facing reporting needs.
Field-Use Limitation
Local amendments, utility requirements, service equipment constraints, and AHJ interpretation remain final. This page documents source alignment; it does not replace licensed design review.
Live Tool Link
Open the Residential Load Calculator to review the corresponding live aligned workflow.
Open Residential Load ToolHVAC BTU: Mechanical Source Alignment Record
HVAC BTU Load Calculator · Source Alignment Snapshot
This section defines how the HVAC BTU Load Calculator aligns with Manual J-style thermal load estimation, including envelope assumptions, equipment load relationships, and HVAC sizing reference workflows.
Primary Standards Basis
Manual J-Style Thermal Load Workflow
The live BTU engine aligns with Manual J-style thermal baseline review, regional design assumptions, directional gain handling, and preliminary HVAC sizing workflows.
Related downstream dependencies
This tool informs electrical and duct workflows by generating BTU, tonnage, and airflow reference values used later in the ecosystem.
Mapped Logic Scope
HVAC BTU scope of alignment
Envelope baseline
Structure age, insulation assumptions, regional climate baseline, and building-envelope load effects.
Solar and glazing
Directional glazing review, solar-gain weighting, and opening-related heat-load adjustments.
Sizing outputs
BTU results, tonnage guidance, airflow reference values, and report-facing HVAC sizing summaries.
Ecosystem handoff
Electrical demand handoff support and upstream airflow guidance for later Manual D-style duct evaluation.
Reference Defaults Posture
Where field measurements or manufacturer data are unavailable, the tool may apply bounded reference assumptions for envelope, infiltration, and climate-sensitive thermal workflows so the estimate remains usable.
Verification Posture
This engine is maintained as a field-facing HVAC sizing workflow and is documented here as part of the broader TradeHub thermal and mechanical alignment stack.
Field-Use Limitation
Final equipment selection, commissioning, installed-condition verification, and manufacturer compliance remain outside the software and must be confirmed by the responsible professional.
Live Tool Link
Open the HVAC BTU Load Calculator to review the corresponding live thermal alignment workflow.
Open HVAC BTU ToolBreaker Sizing: Electrical Source Alignment Record
Breaker & Panel Load Calculator · Source Alignment Snapshot
This section defines how the Breaker & Panel Load Calculator aligns with load-to-amperage conversion, 125 percent continuous-load adjustment, and next-standard OCPD screening for field-use breaker review workflows.
Primary Standards Basis
Load-to-Breaker Reference Workflow
The live Breaker & Panel Load Calculator aligns with field-use breaker screening by converting connected load into amperage, applying continuous-load adjustment where required, and matching the result to the next standard breaker rating used in common one-phase 120V and 240V review workflows.
Current source family
NFPA 70® continuous-load overcurrent guidance and standard ampere rating workflow, with TradeHub using load, voltage, and runtime posture to support practical breaker-selection screening.
Mapped Logic Scope
Breaker sizing scope of alignment
Load basis
Connected load entry in watts or volt-amperes, paired with selected system voltage for amperage screening.
Continuous-load logic
125 percent adjustment workflow when the load is expected to run for 3 hours or more before breaker selection is screened.
Field outputs
Base current, adjusted amperage, next standard breaker match, utilization view, headroom note, and printable field summary output.
Workflow boundary
Field-facing OCPD screening support only; conductor ampacity, terminal limits, equipment listing, and installation conditions remain outside the calculator boundary.
Reference Defaults Posture
The workflow uses bounded reference math for common one-phase breaker review, with user-entered load, runtime posture, and voltage selection driving the screening result. It does not attempt to replace conductor sizing, equipment instructions, or full panel design review.
Verification Posture
This engine is maintained as a field-facing breaker-sizing reference workflow and is documented here as part of the broader TradeHub electrical alignment stack.
Field-Use Limitation
Final conductor sizing, equipment rating confirmation, listing requirements, local amendments, panel configuration, and AHJ interpretation remain final. This alignment record supports field-use screening; it does not replace project-specific code review.
Live Tool Link
Open the Breaker & Panel Load Calculator to review the corresponding live breaker-screening reference workflow.
Open Breaker Panel ToolVoltage Drop: Electrical Source Alignment Record
Voltage Drop Calculator · Source Alignment Snapshot
This section defines how the Voltage Drop Calculator aligns with conductor drop screening, one-way length review, material selection, and field-facing upsizing guidance for branch-circuit and feeder workflows.
Primary Standards Basis
Voltage Drop Reference Workflow
The live Voltage Drop Calculator aligns with standard conductor voltage-drop formulas for field-use review, using system type, system voltage, load current, one-way length, conductor material, and conductor size to screen conductor performance before final installation decisions are made.
Related workflow dependencies
This tool supports electrical planning by helping compare conductor size choices against selected voltage-drop targets, with downstream field verification still required for ampacity, derating, installed conditions, and local code review.
Mapped Logic Scope
Voltage drop scope of alignment
Circuit review inputs
Single-phase or three-phase system type, system voltage, load current, one-way length, conductor material, and conductor size inputs.
Calculation workflow
Voltage-drop calculation in volts and percent using one-way length workflow and material-dependent resistance constants for conductor screening.
Field outputs
Status evaluation, voltage at load, target-drop comparison, recommended conductor sizing, upsizing ladder review, and max-length mode support.
Environmental allowance
Light environmental adjustment to reflect warmer or more bundled field conditions while preserving the page’s screening-first workflow posture.
Reference Defaults Posture
The workflow uses bounded reference math and user-selected review inputs to keep conductor screening usable in the field. It does not attempt to replace full ampacity, temperature-correction, conductor-derating, or terminal-rating review.
Verification Posture
This engine is maintained as a field-facing voltage-drop reference workflow and is documented here as part of the broader TradeHub electrical alignment stack.
Field-Use Limitation
Final conductor sizing, ampacity confirmation, temperature adjustment, derating, equipment instructions, local amendments, and AHJ interpretation remain final. This alignment record supports field-use screening; it does not replace project-specific code review.
Live Tool Link
Open the Voltage Drop Calculator to review the corresponding live conductor-screening reference workflow.
Open Voltage Drop ToolConduit Fill: Electrical Source Alignment Record
Conduit Fill Calculator · Source Alignment Snapshot
This section defines how the Conduit Fill Calculator aligns with NEC Chapter 9 raceway-fill screening, grouped conductor area review, raceway trade-size guidance, and field-facing conduit workflow support.
Primary Standards Basis
NEC Chapter 9 Raceway Fill Workflow
The live Conduit Fill Calculator aligns with NEC Chapter 9 raceway-fill screening workflow using allowable fill percentage, raceway internal area, conductor area, grouped conductor counts, and trade-size review to help electricians evaluate whether a selected conduit is likely to remain within the applicable fill limit before installation decisions are finalized.
Related workflow dependencies
This tool supports electrical planning by screening physical raceway fit for grouped conductors, surfacing upsizing guidance, and bridging back to the voltage-drop workflow when conductor regrouping or sizing changes are being considered.
Mapped Logic Scope
Conduit fill scope of alignment
Raceway review inputs
EMT, PVC Sch 40, PVC Sch 80, RMC, and IMC raceway selection with trade-size review against grouped conductor makeup.
Calculation workflow
Allowable fill from NEC Chapter 9 Table 1, raceway internal area from Table 4, and conductor-area screening from Table 5 for total grouped conductor review.
Field outputs
Fill percent, allowable fill area, grouped conductor area, recommended raceway trade size, upsizing ladder guidance, and field-facing status output.
Advanced field screening
Mixed conductor groups, parallel raceway review, pull-difficulty screening, and ampacity / derating awareness reminders to support real field installation decisions.
Reference Defaults Posture
The workflow uses bounded NEC Chapter 9 reference values and user-entered conductor makeup to keep raceway screening usable in the field. It does not attempt to replace complete ampacity, conductor adjustment, equipment-terminal, or installed-condition review.
Verification Posture
This engine is maintained as a field-facing conduit-fill reference workflow and is documented here as part of the broader TradeHub electrical alignment stack.
Field-Use Limitation
Final raceway selection, conductor makeup, ampacity confirmation, derating, installed conditions, local amendments, and AHJ interpretation remain final. This alignment record supports field-use screening; it does not replace project-specific code review.
Live Tool Link
Open the Conduit Fill Calculator to review the corresponding live raceway-fill reference workflow.
Open Conduit Fill ToolManual S: Equipment Selection Source Alignment Record
Manual S Equipment Selection Calculator · Source Alignment Snapshot
This section defines how the Manual S Equipment Selection workflow aligns with load intake, expanded performance screening, capacity verification, oversize review, and downstream Manual D bridge preparation.
Primary Standards Basis
Manual S Equipment Selection Workflow
The live Manual S workflow aligns with equipment-selection review using Manual J design loads, manufacturer expanded performance data, sensible and latent capacity checks, heating output checks, and oversize screening for field-facing reference use.
Related upstream and downstream dependencies
Manual J load inputs inform the selection screen, while blower profile, delivered airflow, static point, and device pressure-drop assumptions can carry downstream into Manual D workflows.
Mapped Logic Scope
Manual S scope of alignment
Design-load intake
Manual J total, sensible, and latent cooling loads, heating load, airflow targets, and indoor/outdoor design conditions.
Equipment screening
Brand, equipment type, nominal size, matched-system filtering, and OEM expanded performance table screening at design conditions.
Performance verification
Total cooling, sensible cooling, latent balance, heating output, and oversize-limit review for candidate pass/fail evaluation.
Manual D bridge
Blower profile, delivered airflow, static point, and device pressure-drop values prepared for downstream duct-design reference workflows.
Reference Defaults Posture
Where complete field data or manufacturer detail is unavailable, the workflow may rely on bounded reference assumptions for matching, screening, and design-condition review. User-entered project values still govern when supplied.
Verification Posture
This workflow is maintained as a field-facing equipment-selection alignment record and is documented here as part of the broader TradeHub HVAC alignment stack.
Field-Use Limitation
Final equipment selection, AHRI matching, manufacturer data confirmation, installed-condition review, and local code or AHJ interpretation remain final. This alignment record supports reference workflow use; it does not replace project-specific design responsibility.
Live Tool Link
Open the Manual S Equipment Selection workflow to review the corresponding live equipment-selection reference logic.
Open Manual S ToolManual D: Duct Design Source Alignment Record
Manual D Duct Design Calculator · Source Alignment Snapshot
This section defines how the Manual D Duct Design Calculator aligns with duct design workflow logic, pressure-budget review, effective length handling, and field-facing airflow diagnostics.
Primary Standards Basis
ANSI/ACCA Manual D Duct Design Workflow
The live duct-sizing engine aligns with Manual D-style duct design relationships, pressure-budget review, effective length handling, and friction-rate workflow support for field-facing reference use.
Related upstream dependencies
Manual J load assumptions and equipment-side inputs may inform airflow targets, but this block is focused on duct-path design logic rather than whole-home load derivation.
Mapped Logic Scope
Manual D scope of alignment
Pressure workflow
Available Static Pressure, component pressure-loss budgeting, and blower-table-aware pressure review.
Path calculation
Total Effective Length, fitting equivalent length handling, and multi-path critical-path evaluation.
Sizing logic
Friction Rate workflow, airflow targets, velocity screening, and terminal-face performance checks.
Field diagnostics
Flex compression penalties, restriction alerts, warning states, and report-facing diagnostics for field review.
Reference Defaults Posture
Where installed-component data, manufacturer tables, or measured pressure losses are unavailable, the tool may apply bounded TradeHub defaults to preserve workflow continuity. Those defaults support estimation and diagnostics only.
Verification Posture
This engine is maintained as a live duct-design reference workflow for pressure budgeting, friction-rate review, and trade-facing diagnostics aligned to the broader TradeHub mechanical source stack.
Field-Use Limitation
Measured field conditions, installed layout, blower performance, manufacturer data, local code amendments, and AHJ interpretation remain final. This alignment record does not replace field verification or stamped design review.
Live Tool Link
Open the Manual D Duct Design Calculator to review the corresponding live duct-design alignment workflow.
Open Manual D ToolVerified Tool Launch
Apply Verified Logic
Launch TradeHub reference calculators to apply NEC and ACCA-aligned logic directly to field calculations, design validation, and permit-facing documentation workflows.
Electrical Suite
NEC-aligned workflows for residential service sizing, voltage-drop analysis, and conductor planning.
Live Tool
Residential Load Calculator
NEC optional-method service sizing and panel capacity workflow.
Live Tool
Voltage Drop Calculator
Conductor performance, drop-percent screening, and feeder validation.
Live Tool
Conduit Fill Calculator
Raceway fill, conductor count, and compliance planning workflow.
Mechanical / HVAC Suite
ACCA-aligned workflows for thermal load calculation, equipment selection, and duct system design.
Live Tool
HVAC BTU Load Calculator
Manual J-style load estimation and airflow baseline workflow.
Live Tool
Manual S Equipment Selection Calculator
Capacity screening, system matching, and equipment selection workflow.
Live Tool
Manual D Duct Design Calculator
Friction-rate calculation and duct path design workflow.
Legal Notice & Methodology
TradeHub.tools is a digital data utility. Logic verification is conducted by mapping software outputs against printed source text. While we strive for 1:1 alignment with published national code tables, the onsite licensed professional and local AHJ maintain final authority over all installations and design decisions.