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An essential app for electrical professionals! This is the most intuitive wire/cable gauge calculator compliant with the KEC (Korean Electrical Installation Code) and KS C IEC standards.

You no longer need to look up complex formulas or allowable current tables every time.

With just a few touches, it analyzes load current and voltage drop rates to calculate the final recommended wire size (mm²).

⚡ Key Features

1. KEC Standard-Based Technical Calculation Engine

Support for Various Phase/Wire Types: Supports power formulas for single-phase 2-wire (1Ø2W), 3-phase 3-wire (3Ø3W), and 3-phase 4-wire (3Ø4W).

Allowable Current Matching: Equipped with standard allowable current tables for 2-core and 3-core CV cables (XLPE insulation) according to installation methods B1 (laying inside conduit) and C (direct wall/tray installation). Voltage Drop (e) Calculation: Derivation of accurate voltage drop (V) and voltage drop rate (%) using the KEC standard simplified formula for copper conductors (coefficients 35.6 / 30.8 / 17.8).

Safety Standard Determination: Automatically determines the safer and larger standard wire size (1.5 ~ 300 mm²) between the voltage drop condition and the allowable current condition.

2. Comparative Analysis Table at a Glance (Detailed Calculation Basis)

Clicking 'View Detailed Calculation Basis' allows you to immediately compare the allowable current, estimated voltage drop rate, and KEC judgment results (Compliant / Excessive Current / Excessive Drop) of the entire list of standard wire sizes (1.5~300 mm²) in a table.

The row of the finally selected wire size is highlighted with a yellow background, maximizing readability during working meetings or field reviews.

3. Overwhelming UI/UX Focused on the Practitioner

Automatic Phase/Wiring System Linkage: Depending on the selected wiring method, the voltage is automatically matched to either 220V or 380V, arranged for easy recognition at a glance.

Input Window Collapsing (Collapsing UI): Clicking 'Calculate' neatly collapses the complex input window into a summary card, and the final selection result is immediately displayed on the screen in large gold typography without visual distraction.

Edit and Reset: Clicking 'Edit' restores the input field with the previous values ​​intact, and 'Reset' allows you to quickly prepare for the next calculation.

4. Multilingual Support and Other Conveniences

Supports Korean (ko-KR) and English (en-US) language packs, automatically converting to match the system language.

With a fixed portrait mode interface, it allows for comfortable, one-handed use in the field without shaking.

🛠️ Recommended for:

This app is for: Electrical construction design and supervision practitioners

Electrical safety managers, fire/facility managers

Electrical technicians and foremen at industrial sites

Electrical engineer, industrial electrician, and master electrician certification candidates and university students majoring in the field

The calculation results of this app follow the official standards of the Korean Electrical Equipment Regulations (KEC), but since there may be differences depending on the actual construction environment (reduction factors such as ambient temperature and multi-layer installation), please reconfirm the drawings and safety guidelines during the final design stage.