Blue boxes are ideal for indoor residential, low-voltage, and renovation projects, while gray boxes are commonly used in industrial, commercial, and outdoor settings. Understanding Color-Coding: Blue and gray electrical boxes serve different purposes based on color-coding. In this article, we'll explore the differences between blue and gray electrical boxes, considering factors such as functionality, code requirements, and overall visual. What is an Electrical Distribution Box? Panel Types Explained If you've ever opened that gray metal box on your wall to flip a tripped breaker, you've encountered an electrical distribution box. It helps organize, protect. In this guide, we'll break down the 12 main types of distribution boxes in a way that's easy to understand. We'll chat about what each one does, where it shines, and then dive into how to choose the perfect box for your needs. Plus, we'll sprinkle in some practical tips to make sure you're not. Distribution boxes, also known as electrical distribution boards or panels, are pivotal components in electrical systems, ensuring the safe and organized distribution of electrical power throughout residential, commercial, and industrial environments. These boxes house various circuit breakers.