# Cable Tray Fill Calc — NEC Cable Tray Fill Tool

> NEC Cable Tray Fill Tool (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/cable-tray-fill-calc/id6761246731 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities, Productivity
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-03-29
- Data updated: 2026-07-16
- User reviews in markdown: https://appshunter.io/ios/app/cable-tray-fill-calc/id6761246731/reviews.md

## What is Cable Tray Fill Calc?

Built for electricians, cable-tray installers, and EEs who need a quick NEC 392 fill check on the deck - not a dashboard you log into.

WHAT IT DOES
Computes total cable cross-section as a percentage of tray area and compares against the NEC 392 maximum fill: 50% for ladder and wire-basket trays, 40% for solid-bottom and channel trays. Flags over-fill and shows how many more cables of the same type fit before the limit.

INPUTS
- Unit system: SAE (inches) or Metric (mm)
- Tray type: Ladder, Solid Bottom, Wire Basket, Channel
- Tray size: 9 imperial sizes / 9 metric sizes
- Cable type: AWG #14 to 4/0 (SAE) or 1.5 to 50 mm² (Metric)
- Cable count

RETURNS
- Tray area (sq in or sq mm)
- Total cable area (sq in or sq mm)
- Fill percentage
- Maximum allowed fill per NEC 392 (50% or 40% depending on tray type)
- Remaining capacity in number of cables
- Over-fill warning (red banner) when above the allowed percentage

WHY THIS APP, NOT THE FREE ONES
- Math is shown - tray area, total cable area, and the percentage all visible.
- NEC 392 fill limits applied automatically - pick the tray type and the cap follows.
- Works offline - basements, riser shafts, mid-deck rough-ins. Always available.
- No login. No ads. No telemetry. No subscription.

PRICING
$4.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing.

NOT A SUBSTITUTE FOR
AHJ-stamped electrical drawings. Manufacturer cable-tray load tables. NEC 392 ampacity derating for closely-spaced multiconductor cables - this app handles cross-section fill only, not the temperature derate. Always cross-reference the engineer-stamped layout.


## Version history (last 3 releases)

### 1.0.2 — 2026-06-30

Added a More Pro Tools section to discover related field calculators.

### 1.0.1 — 2026-04-29

Listing refresh - clarified the description, inputs/outputs, and which standards are referenced. No functional changes.

### 1.0 — 2026-03-30

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-16.*