Audit one documented raceway-fill schedule from source-labelled total internal area, an explicit allowed percentage, and complete conductor/cable groups—without choosing a raceway or declaring compliance.
A quick decision brief for this specific tool
One de-identified reviewed raceway schedule; named raceway-area, conductor/cable-area and allowed-fill sources; one area unit system; total internal area; the explicitly selected fill percentage; and one through three complete named groups with whole counts and area per item
Source-preserving occupied area and percentage, entered allowed area, signed area difference and entered-allowance utilization for that schedule only
Sum whole item count x entered area per item, divide by the entered total raceway internal area, and reproduce only the entered allowed percentage; do not select a trade size, raceway, conductor/cable, counting treatment, fill rule, upsize or compliance verdict
Choose your path
Reproduce one source-labelled raceway-fill schedule from total internal area, an explicitly selected allowed-fill percentage and complete conductor/cable groups without choosing products or declaring compliance.
Sum source-owned conductor and cable areas without a generic AWG/insulation table silently replacing the design schedule.
Name the raceway, item-area and fill-rule sources; copy one through three complete groups; inspect occupied and entered-allowance arithmetic.
Can trace every group while raceway and conductor/cable selection remain in the complete design.
Verify that the denominator is total internal area rather than an already reduced 40% table area.
Inspect the wrapping source cards, paired area units, entered percentage and group steps before comparing submitted arithmetic.
No double-applied fill factor, generic table lookup, upsize instruction or compliance claim is generated.
Learn that conductor count, complete raceways, short nipples, cables and actual dimensions can change the controlling schedule.
Run separate education records with different source-selected percentages and item groups, treating the signed difference as arithmetic only.
Can reproduce the math and list every classification, pulling, adjustment and approval check the tool omits.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Tools you might need next
Audit voltage-drop arithmetic for one source-selected candidate conductor using documented impedance, path and units—without selecting AWG, ampacity, an allowable drop or code compliance.
Audit one documented series circuit path from source-labelled segment currents, lengths, path multipliers and effective impedances—without assuming copper, choosing wire size or applying a pass/fail threshold.
Verify EMT/PVC conduit fill per NEC Chapter 9 tables. Free online electrical work calculator with instant, accurate results.
Copy the total internal area for the exact source-selected raceway and trade size. Do not enter an already reduced 40%, 31%, 53% or special-condition allowance as the denominator, because applying a percentage to that value again double-counts the limit.
Raceway basis = entered total internal cross-sectional areaEach complete group keeps its own name, whole count and cross-sectional area from the controlling table, manufacturer data or actual-dimension record. The tool does not infer AWG, insulation, cable treatment, grounding/bonding inclusion or item classification.
Occupied area = Σ (whole item count × entered area per item)The tool reports both quantities and their signed arithmetic difference but never labels that difference compliant or overfilled. The applicable percentage, complete/special raceway condition, pulling design and adopted approval remain with the responsible source.
Occupied % = occupied area ÷ total area; entered allowed area = total area × entered %Updated: August 2026
A reviewer copies total raceway area, a source-selected percentage and four identical item areas. The tool divides by total internal area rather than a pre-limited table value, exposing the prior double-application defect without selecting a product.
A designer enters separate source-owned groups in square millimetres or square inches. Group steps preserve each whole count and item area while cable treatment, jacket dimensions and grounding/bonding inclusion remain in the reviewed schedule.
An apprentice runs separate de-identified records when the responsible exercise selects different complete-raceway or short-condition percentages. The signed difference is a calculation question, not an automatic permission to install.
Reproduce the occupied-area arithmetic in one reviewed raceway schedule. Name the sources for total internal area, conductor/cable areas and the already selected fill percentage; enter up to three complete item groups in one unit system. The output is a source-preserving audit, not a trade-size lookup, pulling design or approval decision.