---
title: "Transformer Calc NEC - Reviews, Revenue and Downloads in South Africa | Apple App Store"
description: "NEC transformer overcurrent protection calculator for electricians, apprentices, and electrical engineers. Size primary and secondary OCPD per NEC Table 450.3(B), calculate full-load amps (FLA), and s"
---

# Transformer Calc NEC — South Africa
> NEC Art.450 kVA & OCPD

![Transformer Calc NEC App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/c5/f6/df/c5f6df4b-cdda-aab8-bbba-6eb08cd88b9a/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/434x0w.png)

**Developer:** [Rizvan Adzhoian](https://apptail.io/developer/rizvan-adzhoian-zsuKac)
**Category:** Utilities
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.electools.transformerCalculator
**Store:** Apple App Store
**Country:** South Africa
**Version:** 1.0.7 (released 2026-05-18)
**Original Release:** 2026-04-24
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/za/app/app/id6763311943)
**AppTail Page:** [https://apptail.io/app/transformer-calc-nec-AReA/south-africa](https://apptail.io/app/transformer-calc-nec-AReA/south-africa)

## Transformer Calc NEC Description
NEC transformer overcurrent protection calculator for electricians, apprentices, and electrical engineers. Size primary and secondary OCPD per NEC Table 450.3(B), calculate full-load amps (FLA), and select conductors from Table 310.16 - all per NEC 2023 (NFPA 70). Works 100% offline on the job site.

Whether you're sizing overcurrent protection for a 75 kVA, 480-to-208V three-phase transformer, or checking if primary-only protection requires 125% or 300%, this calculator gives you accurate NEC-compliant results in seconds. Use it as your go-to transformer protection reference - from kVA rating to OCPD and conductor selection.

TRANSFORMER CALCULATOR FEATURES:
- Primary overcurrent protection per NEC 450.3(B) - 125%/167%/250%/300% rules
- Secondary overcurrent protection per NEC 450.3(B) - 125%/167%/250% rules
- Primary-only and primary+secondary protection methods
- Full-load ampere (FLA) calculation: single-phase and three-phase
- Automatic next-standard-size-up per NEC 240.6(A) with Note 1 logic
- All standard OCPD ratings from 15A to 6000A per NEC 240.6(A)
- Conductor sizing from NEC Table 310.16 (75°C column)
- Copper and aluminum conductor support
- 12 standard kVA ratings from 3 kVA to 1000 kVA
- 5 voltage presets: 120V, 208V, 240V, 480V, 600V
- Single-phase and three-phase support
- NEC article references for every calculation result

NEC REFERENCES INCLUDED:
- NEC Table 450.3(B) - Transformer overcurrent protection (600V or less)
- NEC 450.3(B) Note 1 - Next-size-up rule for primary-only protection
- NEC 240.6(A) - Standard overcurrent device ratings
- NEC Table 310.16 - Conductor ampacity at 75°C

PROTECTION METHOD RULES:
- Primary Only (≤9A): Maximum 167% primary OCPD
- Primary Only (≥9A): Maximum 125% primary OCPD (next size up per Note 1)
- Primary Only (any): Maximum 300% if 125%/167% doesn't correspond to standard size
- Primary + Secondary: Maximum 250% primary, plus 125%/167% secondary OCPD

CALCULATION RESULTS INCLUDE:
- Primary full-load amps (FLA) with formula
- Secondary full-load amps (FLA) with formula
- Primary OCPD size (standard rating per NEC 240.6(A))
- Secondary OCPD size when applicable
- Primary and secondary conductor sizes with ampacity
- Applicable NEC percentage rules and references
- Protection method notes and explanations

PRO FEATURES (one-time purchase):
- No ads - clean interface for professionals
- Save transformer calculation history with labels
- Export calculations as PDF reports for permits and records
- Dark theme support

HOW THE TRANSFORMER CALCULATOR WORKS:
1. Select phase type (single-phase or three-phase)
2. Choose kVA rating from standard sizes
3. Select primary and secondary voltage
4. Choose protection method (primary only or primary + secondary)
5. Select conductor material (copper or aluminum)
6. Get OCPD sizes, conductor recommendations, and NEC references instantly

BUILT FOR ELECTRICIANS ON THE JOB SITE:
This transformer calculator is designed by electricians, for electricians. Enter your transformer parameters, get the correct OCPD size and conductor recommendation instantly - no complicated menus or unnecessary features. One-hand operation, instant results.

PERFECT FOR:
- Licensed electricians sizing transformer protection daily
- Electrical apprentices studying for journeyman exams
- Electrical engineers and designers
- Electrical contractors bidding jobs
- NEC code exam preparation
- Journeyman and master electrician exam study

OFFLINE & PRIVACY:
- Works 100% offline - no internet needed on the job site
- No account required
- No data collection - your calculations stay on your device

Simplify your transformer protection sizing on the job site.

## Transformer Calc NEC Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/33/6c/47/336c47ee-dde3-32dc-5bb9-de9f02a1ae76/ipad_01_main_default.png/2064x2752.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d1/bd/66/d1bd6678-81c1-f0d6-fcc0-e3085b53e679/ipad_02_main_filled.png/2064x2752.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/22/12/bf/2212bff1-bc6e-e706-eafb-e76994b45dd4/ipad_03_history.png/2064x2752.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c0/35/b7/c035b7ed-b19c-3bff-3a40-e26555e24939/ipad_04_settings.png/2064x2752.png)



## Transformer Calc NEC In-App Purchases
| Item | Price |
|------|-------|
| Pro Unlock | 59.99 R |





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