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Understanding Amperage Rating: A Comprehensive Guide

Amperage rating—often referred to as ampacity—is the maximum current a wire or cable can carry safely without exceeding its temperature rating. Whether you’re sizing electrical wire for a new installation or troubleshooting an existing circuit, understanding ampacity is critical for safety, compliance, and performance. In this article, we’ll explore how amperage ratings are determined, the factors that influence them, and actionable tips to help you choose the right cable or wire for your project.