Electrical Boxes: Types, Materials, and Uses

Key Takeaways:

• Which Type of Switch Box Should You Use?

  • Plastic Electrical Boxes (PVC or Polycarbonate): Lightweight, non-conductive, and ideal for indoor residential use.
  • Metal Electrical Boxes (Steel or Galvanised Iron): Fire-resistant and durable, suitable for industrial or high-heat environments.
  • Weatherproof Electrical Enclosures: UV-resistant and IP-rated, used for outdoor setups like lighting or CCTV.
  • Electrical Junction Boxes: Allow safe connection and extension of wiring, available in surface or recessed options.
  • Ceiling Boxes: Rated by weight to support light fixtures or ceiling fans, installed flush in the ceiling.
  • Modular Switch Back Boxes: Designed for modern switch systems, available in multiple gang sizes for flexibility.

Introduction

Electrical boxes, also known as junction boxes, switch boxes, or outlet boxes, are enclosures that protect electrical connections, switches, and outlets. Understanding the different types of electrical boxes and their specific applications is critical for both safety and long-term system performance. Using the wrong box or material can lead to overheating, corrosion, or circuit failure over time.

Not sure which switch box is right for your project? This article shares the most common types and where they’re best used.

1. Plastic Electrical Boxes (PVC or Polycarbonate)

Plastic boxes are popular in residential settings due to their lightweight and non-conductive properties. They’re corrosion-resistant and ideal for indoor electrical installation service tasks, such as lighting points, switches, and wall sockets. However, they may not be suitable for outdoor or high-heat environments, given the possibility of warping, melting, or degradation when exposed to high temperatures.

2. Metal Electrical Boxes (Steel or Galvanised Iron)

Metal boxes are durable, fire-resistant, and are ideal for exposed or industrial environments where safety is critical. They are often used with metal conduit systems because they allow grounding, which enhances electrical safety. Meanwhile, it is important to ensure proper earthing and compatibility with metal fittings.

3. Weatherproof Electrical Enclosures (Outdoor Use)

Outdoor installations require weatherproof electrical enclosures that can withstand Singapore’s heat, humidity, and rain. These are typically made from UV-resistant polycarbonate or die-cast aluminium and are perfect for outdoor lighting, water heaters, or CCTV points. When installing one, remember to look for an IP rating (e.g., IP65) for proper outdoor compliance.