Otis Singleton
Cutting plastic electrical wall plates can be a tricky task, and there are several reasons why you might need to do it. For example, you may need to cut a plate in half for a custom application, or you may want to drill a bigger hole to run cable wires through it. The first step is to remove the cover plate from the electrical outlet, and then you can cut it with a knife, saw, or drill. It's important to wear eye and ear protection when using power tools, and to be aware that plastic chips easily, so using a wood-cutting saw is not recommended.
| Characteristics | Values |
|---|---|
| Tools | Knife, metal-cutting saw, box cutter, hacksaw, bandsaw, jigsaw, scroll saw, power saw, drill, belt sander, tile setter's wet saw |
| Preparation | Unscrew the cover plate, lay it flat, drive in wood screws, measure and mark the cut, secure with painter's tape |
| Cutting technique | Cut slowly, score the plastic first, cut from the back, cut from the front to back, hold the blade at a 90-degree angle, apply slight downward pressure |
| Challenges | Plastic chips easily, circular saws may cause shattering, hand saws leave rough edges, risk of cracking the plate |
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What You'll Learn
Using a knife or saw
First, remove the cover plate from the electrical outlet. Most cover plates have one or two screws, and a screwdriver works best for this. It is important to never attempt to cut a cover while it's installed, as you could shock or electrocute yourself. Place a piece of painter's tape over the face of the cover plate to protect it from surface scratches.
Next, you will need to secure the plate. One way to do this is to lay the plate flat on a scrap piece of plywood with the front side facing up. Drive a 6-gauge, 3/4-inch wood screw into each of the holes on the face of the plate. Tighten the screws enough to hold the plate steady while you cut it. Alternatively, you can secure the plate face down to a 2x4 with wood screws driven through the holes.
Now you are ready to cut. If using a knife, use a sharp utility knife to score a line along the edge of the plate. Complete the cut by making repeated passes with the knife. If using a saw, a fine-tooth hacksaw, band saw, or jigsaw with a metal-cutting blade will work well. Cut slowly and carefully to avoid cracking the plate. A tile saw or a wet saw with a diamond blade is also a good option for cutting through brittle plastic.
Finally, sand the edge of the plate to smooth out any roughness.
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Scoring the plastic
Scoring plastic electrical wall plates is a delicate process. Plastic chips easily, so it is safer to cut it with a knife or a metal-cutting saw. The first step is to unmount the plate from the wall and lay it flat on a stable surface. Use a screwdriver to unscrew the plate.
Before scoring the plastic, it is important to measure and mark the desired cut. Use a ruler or straight edge to draw a line along the intended cut. This line will guide your scoring and ensure a straight and accurate cut. It is recommended to use a sharp utility knife or a box cutter to score the plastic along the marked line. Apply firm but controlled pressure to create a clean groove in the plastic. Make multiple passes with the knife, gradually deepening the score line with each pass. The goal is to create a weak point in the plastic that will facilitate a clean break.
It is important to work slowly and carefully to avoid applying too much pressure, which can cause the plastic to crack or shatter. Once you have made several passes with the knife, you can try bending the plate along the score line. If the score is deep enough, the plastic should snap cleanly along the groove. After breaking the plate along the score line, you may need to sand the edges to smooth out any roughness.
An alternative method is to use a power saw, such as a jigsaw or a circular saw. However, this requires more skill and caution to avoid shattering the plastic. If using a power saw, always wear eye and ear protection. Secure the plate to a stable surface or workpiece to prevent it from spinning or shifting during cutting. Start the saw at a slow speed and gradually increase it as needed. Gently feed the plate into the blade, ensuring that the blade is perpendicular to the plate to achieve a straight cut.
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Cutting from the front or back
When cutting plastic electrical wall plates, it is important to consider the direction of your cut – whether you should cut from the front or the back of the plate. Cutting from the front of the plate allows you to have greater control over the cut and ensures that you can follow your marked line more accurately. However, cutting from the back can help prevent surface scratches on the front of the plate.
If you choose to cut from the front, start by unscrewing the cover plate and laying it flat with the front side facing up. Secure the plate by driving screws into the holes to hold it in place while you cut. You can then mark and score your cut line, and use a sharp utility knife or a box cutter to make repeated passes along the line until you cut through the plate. For a smoother finish, sand the edge after cutting.
Cutting from the back requires a similar preparation process. Unscrew the cover plate and lay it face down on a piece of wood, securing it with screws through the holes. This will protect the front of the plate from scratches. You can then mark your cut line on the back of the plate and use a fine-tooth hacksaw to cut through the plate and the wood. Alternatively, you can use a jigsaw with a fine metal-cutting blade, working slowly and carefully to avoid cracking the plate.
The direction you choose to cut – from the front or the back – depends on your specific needs and the tools you have available. Cutting from the front allows for more precise cuts along your marked line, while cutting from the back can help protect the visible surface of the plate from scratches.
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Trimming and finishing
Before you begin cutting, it is important to measure and mark the plastic electrical wall plate. Use a ruler and a sharp utility knife to score a line along the edge of the plate. This will create a guideline for your cut and help ensure a straight edge. You can also use a box cutter or a metal-cutting knife for this step. Make several passes with the knife to create a deep score, allowing you to easily snap off the excess plastic.
If you prefer to use a saw, a fine-tooth hacksaw or a jigsaw fitted with a metal-cutting blade can be used. Place the plate securely on a flat surface, such as a scrap piece of plywood, and clamp it down if possible, to prevent it from moving during cutting. If using a jigsaw, set the fence at an appropriate distance from the blade and push the plate slowly through the saw to avoid bending or wandering of the blade. Alternatively, a tile setter's wet saw with a diamond blade can easily slice through plastic.
Once you have made your cuts, it is important to finish the edges smoothly. Sand the edges with fine-grit sandpaper to remove any roughness or sharp edges. You can use a belt sander for this step, but be cautious not to over-sand and damage the plate. Finally, you may want to consider painting the exposed edges to match the rest of the plate or to achieve the desired aesthetic.
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Safety considerations
Safety should be a top priority when cutting plastic electrical wall plates. Here are some essential safety considerations to keep in mind:
Electrical Safety: Before attempting any modifications, ensure the power is turned off at the circuit breaker to eliminate the risk of electric shock or electrocution. Never cut the plate while it is still installed. Remove the cover plate from the electrical outlet, taking note of the number and location of screws, and use a screwdriver for this purpose.
Personal Protective Equipment (PPE): It is crucial to wear appropriate PPE to safeguard yourself from potential hazards. Always wear eye and ear protection when using power tools to avoid injuries from flying debris or loud noises. Consider wearing gloves and a respirator or mask to protect your hands and lungs from dust and plastic particles.
Secure Workpiece: To ensure a stable and secure cutting process, it is important to properly secure the plastic wall plate. One method is to drive wood screws through the holes of the cover plate into a piece of scrap wood, as suggested by Scovell Remodeling. This technique prevents the need for clamping and reduces the risk of cracking the plate.
Tool Selection: Choosing the right tool for cutting plastic electrical wall plates is vital for safety. Avoid using a wood-cutting saw, as plastic chips easily, and opt for a knife, metal-cutting saw, or a fine-tooth hacksaw instead. A scroll saw is also a suitable option due to its thin blade, which reduces the risk of cracking the plastic. If using a power saw, ensure the motor speed is kept low, and always work slowly and carefully.
Pre-Scoring: Pre-scoring the plastic before making the final cut can help prevent chipping and cracking. Use a sharp utility knife or a box cutter to make multiple passes along the intended cutting line, scoring the plastic until you can easily snap off the waste piece.
Post-Cutting Finishing: After cutting, it is important to finish the edge smoothly to prevent sharp edges and ensure a safe installation. Sand the cut edge to smooth out any roughness or burrs. Additionally, inspect the cut edge for any cracks or defects that could weaken the structural integrity of the plate, especially if it is made of brittle materials like phenolic resin or Bakelite.
Remember, always exercise caution and follow safety guidelines when working with power tools and electrical equipment.
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Frequently asked questions
Always wear eye and ear protection when using power tools. Remove the cover plate from the electrical outlet before cutting. Never attempt to cut a cover while it's installed as you could shock or electrocute yourself.
You can use a knife, hacksaw, bandsaw, jigsaw, or a scroll saw. If using a knife, make sure to line up a ruler with the marks you made and score a line along the edge. Make repeated passes to cut through the plate. If using a saw, cut from the back of the plate.
Place a piece of painter's tape over the face of the cover plate to protect it from surface scratches. Draw a line to follow on the backside of the cover plate, using a marker. This is the line you need to follow when cutting.
Use a fine-tooth blade. A metal-cutting blade is preferable to a wood-cutting blade as plastic chips easily. If using a jigsaw, a fine metal-cutting blade can be used by keeping the motor speed down and working slowly and carefully.
Plastic wall plates are usually made of phenolic resin or Bakelite, which is fire-resistant but brittle. Pushing too hard on the tool or flexing from side to side risks cracking the plate. Do not stop drilling until you go through the other side of the plate.
