Table of Contents
1. What is an Outlet Box?
An electrical junction box, commonly referred to as an electrical box, is a container used to store junctions, switches, and outlets. It works as a protective shell, guaranteeing the safety and security of the wire within. The outlet or switch is usually located inside the wall and accessible from the surface. The two most popular materials for outlet boxes in both residential and business settings are plastic and metal, though there are other options as well.
2. Plastic Outlet Boxes: Pros and Cons
Plastic outlet boxes are a popular choice for many electricians and DIY enthusiasts. Here’s why:
Pros of Plastic Outlet Boxes
a) Cost-Effective: Plastic outlet boxes are generally more affordable than their metal counterparts. For those on a budget or handling large projects, this can be a significant factor in choosing plastic.
b) Lightweight and Easy to Install: Plastic outlet boxes are much lighter than metal boxes, making them easier to handle and install. This feature is particularly beneficial for DIY enthusiasts or professionals working on large-scale installations.
c) Corrosion-Resistant: Plastic does not rust or corrode over time, which makes plastic outlet boxes ideal for use in areas with high humidity or moisture, such as bathrooms or basements.
d) Non-Conductive: Plastic provides better insulation, which can reduce the risk of electrical shorts. This added layer of protection makes plastic boxes a great option for ensuring safety in homes with children or pets.
Cons of Plastic Outlet Boxes
a) Less Durable: While plastic boxes are lightweight and affordable, they are generally less durable than metal boxes. They can crack or break under heavy impact, especially during installation or in high-traffic areas.
b) Limited Use: Plastic outlet boxes may not support as much weight as metal boxes, which could be a concern if you're installing heavy fixtures or outlets that require strong mounting support.
Tips: For drywall installations, plastic outlet boxes are a top choice.
3. Metal Outlet Boxes: Pros and Cons
Metal outlet boxes are known for their strength and durability. Here’s what you need to know:
Pros of Metal Outlet Boxes
a) Highly Durable: Metal outlet boxes are known for their durability. They provide superior protection against physical damage and are less likely to crack or break. This makes them ideal for high-impact or high-traffic areas.
b) Fire-Resistant: Metal can withstand high temperatures, making it a safer choice for commercial and industrial settings.
c) Better Grounding: Metal outlet boxes can serve as part of the grounding system for the electrical wiring. This grounding feature offers an additional layer of safety by directing stray electrical currents away from users.
d) Versatile: Suitable for both indoor and outdoor use, especially when treated for corrosion resistance.
e) Heavy Load Capacity：If you need to support heavier outlets, switches, or fixtures, metal outlet boxes are the better choice. They can handle the weight of larger components without issue.
Cons of Metal Outlet Boxes
a) More Expensive: Metal outlet boxes tend to be more expensive than plastic boxes. This may be a consideration for those working with a limited budget.
b) Heavier and Harder to Install: Metal boxes are heavier, which can make installation more difficult, especially for DIYers. They also require special tools to install properly, which can add to the overall cost of the project.
c) Corrosion Risk：While metal outlet boxes are durable, they can rust or corrode when exposed to moisture. This makes them less ideal for use in areas with high humidity unless they are coated with a protective layer to prevent corrosion.
*Tips: For outdoor and industrial projects, metal outlet boxes are the best choice.
4. Plastic vs Metal Outlet Box: Key Differences
To help you decide which outlet box is right for your project, here’s a quick comparison:
