Cable Ampere Rating Calculator (BYA & NYY) | IEC & BS Standard

⚡ CircuitSecrets

BYA & NYY Cable Ampere Rating Calculator

Find ampere rating from cable size or cable size from required current — with derating, voltage drop & full reference table per IEC 60502 / BS standard

BYA (BS)

NYY Single

NYY 2/3-Core

NYY Multi

Derating

Voltage Drop

IEC 60502 / BS

Cable Input

Cable Type

BYA (PVC Copper)

NYY

NYY Configuration

Single Core

2/3-Core

Multi-Core

Installation Method

Method

Cable Size

Select Size

Advanced Options

Ambient Temp °C

Grouping Factor 1 cable (×1.0) 2-3 cables (×0.8) 4-6 cables (×0.7) 7-9 cables (×0.6) 10+ cables (×0.5)

Cable Length m

Load Current A

Required Current

Current A

Derating

Ambient Temp °C

Grouping Factor 1 cable (×1.0) 2-3 cables (×0.8) 4-6 cables (×0.7) 7-9 cables (×0.6) 10+ cables (×0.5)

Rating Result

Cable Analysis

Select cable

—

— A

Ampere Rating

—

A (base rating)

Voltage Drop—

0%3% limit5%

► Derating Formula

Cable Derating Method

I_derated = I_base × Ct × Cg

Ct = temp correction factor

Cg = grouping factor

V_drop% = 2×I×ρ×L / (V×A) × 100

ρ(Cu)=17.2 nΩm · ρ(Al)=28.2 nΩm

Reference

Full Rating Table

⚠ Note: Ratings are based on IEC 60502-1 and BS standard reference conditions. Always apply appropriate derating for ambient temperature, grouping and installation method. Consult current wiring regulations for final design.

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