Chloe Zhang
Bending plastic conduit, also known as PVC conduit, is a skill that electricians often need to employ. It is a type of piping that covers wires as they travel from one point to another. Although PVC is typically hard and stiff, it can be bent by applying heat to the desired location. This can be done with a heat gun or hairdryer, or even by hand, using friction. However, it is important to be cautious when applying heat to PVC as it can produce harmful vapours and fumes.
| Characteristics | Values |
|---|---|
| Plastic conduit type | PVC |
| Plastic conduit properties | Lighter than metal conduit, easily cut, withstands corrosive agents, can be joined with glue |
| Bending tools | Heat gun, hair dryer, pipe viper, friction cloth, hands |
| Bending technique | Apply heat to the desired location, bend, cool with water |
| Safety precautions | Wear gloves, avoid indoor bending, use gas mask and safety glasses |
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What You'll Learn
Heating tools for bending plastic conduit
Heating tools are required when bending PVC conduit, as the plastic material must be heated to become malleable and easy to bend. There are various tools available for this purpose, each with its advantages and considerations:
Heat Gun
The most common technique for bending PVC conduit is to use a heat gun. This tool applies heat to the desired location of the bend, making the PVC malleable. It is important to work on larger areas rather than a very small spot to avoid damaging the conduit. A heat gun provides sufficient heat to bend the PVC without causing damage, unlike a torch which can be too hot.
PVC Bendit
The PVC Bendit is a specialised tool designed for heating and bending PVC pipe and electrical conduit. It comes in various series, each catering to different pipe sizes. For example, the Series 'A' fits inside most brands of 1/2-inch and larger Schedule 40/80 PVC pipe, while the Series 'B' bends PVC pipe with an inside diameter of 1 1/4 inch to 6 inches. The 10B PVC Bendit is suitable for those aiming to heat a full 10-foot section of PVC pipe.
Pipe Viper
The Pipe Viper, offered by Rack-A-Tiers, is a versatile and cost-effective tool for cold-bending PVC conduit. It eliminates the need for a heat gun by allowing users to insert a spring into the pipe and bend it across their knee. However, it is important to note that this method requires slight over-bending to accommodate the "pop back" when bending pressure is released. The Pipe Viper is suitable for cold-bending 1/2-inch and 3/4-inch Schedule 40 PVC conduit.
PVC Spring Bender
The PVC Spring Bender from Rack-A-Tiers is another option for bending PVC conduit. It enables easy and fast bending, reducing the chances of kinking the pipe. This tool is particularly useful for achieving the challenging PVC U-bend.
It is worth noting that for PVC conduit under 2 inches, heating and bending are generally more straightforward than with larger diameters. Additionally, wearing gloves is recommended when handling hot PVC to prevent burns, and having a spray bottle of water or a wet rag handy helps to cool down the conduit after shaping.
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Cold bending plastic conduit
However, it's important to note that cold bending is generally only suitable for smaller sizes of PVC conduit. For PVC conduit above 3/4", heat is typically required to bend the material. The most common technique for bending larger sizes of PVC conduit is to use a heating tool, such as a heat gun, to heat the desired location of the bend until the PVC becomes malleable. It's important to work in larger areas to heat the PVC and avoid applying heat to a very small area, as this could damage the conduit. Once the PVC is malleable, hold it in the desired position until it cools. To speed up the cooling process, you can use a spray bottle filled with cool water, a wet rag, or a water hose.
Another option for achieving accurate custom bends without heating the PVC conduit is to purchase manufactured pre-bent angles, such as 90s, 45s, and 30s. These pre-bent angles can be joined with glue to create the desired shape without the need for heating or specialised bending tools.
It's worth mentioning that bending PVC conduit can be tricky, and it's important to take the necessary precautions to avoid injury. When using heat to bend PVC, always wear gloves to protect your hands from burns, and be careful not to overheat the conduit, as this can cause it to become too brittle or even burn.
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Using a template to bend plastic conduit
Bending plastic conduit can be tricky, but with the right tools and techniques, it can be a smooth and straightforward process. One effective method is to use a template, which allows you to replicate the desired bends accurately and consistently. Here's a step-by-step guide on how to use a template to bend plastic conduit:
Prepare the Template
Start by creating a template with electrical metal tubing (EMT). This template will serve as a guide for bending the plastic conduit. Carefully bend the EMT to match the angles and curves required for your installation. Ensure that the template fits the specific dimensions and shape needs of your project.
Mark the Bending Points
Before heating and bending the plastic conduit, clearly mark the desired bending points. You can use a marker, tape, or any other suitable method to indicate where the bends should occur. This will help ensure that you apply heat and bend the conduit in the correct areas.
Heat the Conduit
Plastic conduit, such as PVC, requires heat to become malleable and bendable. Use a heat gun or another suitable heating tool to apply heat to the marked bending points. It's important to work on larger areas rather than focusing on a very small spot, as concentrated heat can damage the conduit. Avoid using an open flame, as it can cause excessive heat and potentially damage the conduit. Instead, use a heat gun or a hairdryer, which provides sufficient heat without the risk of overheating.
Bend the Conduit
Once the plastic conduit becomes malleable, it's time to bend it. Wear heat-proof gloves or oven mitts to protect your hands from the hot plastic. With your gloved hands, gently bend the conduit along the template you created. Ensure that the bends align with the angles and curves of the template. Hold the conduit in the desired position until it cools down and sets in place.
Cool and Check the Bends
After bending, cool the conduit by spraying it with water or using a wet rag. This will help speed up the cooling process and prevent the conduit from warping. Once cooled, carefully inspect the bends to ensure they match the template and meet your installation requirements. If adjustments are needed, you can reheat and bend the conduit again, but be cautious not to overdo this process, as repeated heating and bending can make the conduit brittle over time.
Using a template ensures accuracy and consistency in your bends, making it a valuable technique for bending plastic conduit. Remember to take the necessary safety precautions when working with heat and always work in a well-ventilated area to avoid inhaling harmful fumes. With practice and the right tools, you'll be able to achieve clean and professional bends for your electrical installations.
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Safety tips when heating plastic conduit
Heating plastic conduit is a common method to bend it into the desired shape. However, it is important to follow safety precautions to avoid any hazards and potential injuries. Here are some essential safety tips to keep in mind when heating plastic conduit:
Wear Protective Gear:
Always wear heat-resistant gloves or oven mitts to protect your hands when handling heated PVC conduit. The plastic can become extremely hot and cause serious burns to your skin. It is also recommended to wear safety glasses to protect your eyes from any debris or hot particles that may be released during the bending process.
Ventilation:
Ensure that the work area is well-ventilated as heating PVC can release harmful vapours and fumes, including carbon monoxide and chlorinated furans. These fumes can be dangerous if inhaled, so working in a ventilated space or outdoors is crucial. Consider wearing a gas mask for additional protection if ventilation is limited.
Avoid Direct Flame:
Do not use an open flame, such as a torch, to heat the PVC conduit. This can cause the conduit to become too hot and potentially damage it. It also increases the risk of fire and releases toxic fumes, including vinyl chloride, which is carcinogenic when burned. Instead, use a heat gun or alternative heat sources like a hairdryer or boiling water.
Pre-Shaping:
Before applying heat, consider if you can create the desired shape using pre-bent PVC parts or elbows. This eliminates the need for heating and bending, simplifying the process and reducing potential hazards associated with heat application.
Cooling:
Have a spray bottle filled with water, a wet rag, or a water hose readily available to help cool down the PVC conduit after heating. Cooling the conduit quickly prevents the need to hold it in place while it cools and reduces the risk of accidental burns. Additionally, repeated heating and cooling can make the PVC conduit brittle over time, so be cautious about reheating the same section multiple times.
By following these safety tips, you can effectively heat and bend plastic conduit while minimising potential risks and ensuring a safer working environment.
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Bending plastic conduit without tools
First, mark the point where you want to place the bend with a marker or tape. Then, make two additional marks about eight inches on either side of the desired bending point; this will be the area you apply heat to. Place the conduit on a supporting structure, such as a log or stone, ensuring that the bending point is in the middle.
To heat the conduit, a hairdryer is a safer option than an open flame, as it does not expose the pipe to a naked flame. Hold the hairdryer about three inches away from the conduit and apply heat to the specified region. With your other hand, gently apply pressure in the direction you want the conduit to bend.
Once you have achieved the desired bend, allow the conduit to cool completely. You can speed up this process by using a spray bottle filled with cool water, a wet rag, or a water hose. After it has cooled, check your bends to ensure they are suitable for your installation. If adjustments are needed, you can reheat and reshape the conduit, but be wary of repeating this process too many times as it can cause the PVC to become brittle.
Finally, pressure test the bent conduit to ensure it can withstand the required water pressure.
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Frequently asked questions
You can bend plastic conduit by applying heat to the part of the pipe where you want the bend to go. Once the plastic is malleable, bend it into the desired shape.
You can use a heat gun, or a hairdryer. If you don't want to use heat, you can use a Pipe Viper, which allows you to cold bend.
When applying heat to bend plastic conduit, it's important to be cautious as PVC can produce harmful vapours and fumes, such as carbon monoxide. Wear a gas mask, safety glasses, and heat-proof gloves to protect yourself. Also, remember to work in a well-ventilated area and avoid using a direct flame on the pipe.
