Omar Khalid
Whether or not plastic water pipes need bonding depends on the situation. If the pipe is plastic where it comes out of the ground and remains plastic where it enters individual flats, it does not need to be bonded. However, if the pipe transitions to copper or another metal, it may need to be bonded to prevent the pipe from becoming energized. Ultimately, the decision on whether or not to bond a plastic water pipe is often left to the inspector's interpretation and may vary depending on local regulations and requirements.
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What You'll Learn
Plastic water pipes that convert to copper
Plastic pipes have gained popularity since the 1990s due to their low cost and high reliability. They are known for their resistance to corrosion and pinhole leaks, which are common issues with copper pipes. Additionally, plastic pipes are flexible, easy to install, and can be fabricated to be thick, making them ideal for high-traffic areas. However, they have drawbacks; plastic pipes fail when exposed to chlorine, direct sunlight, petroleum products, and oxygen, making them unsuitable for very hot areas.
Copper pipes, on the other hand, have been used in homes for a long time and are familiar to professional plumbers. They are durable, with a lifespan of 40 to 60 years, and they effectively hold hot or cold water. Copper pipes are also soft and flexible, making them easy to work with. However, they are more expensive than plastic pipes, and they are susceptible to freezing and bursting in cold temperatures.
When converting from plastic to copper, or vice versa, ensuring joint compatibility is crucial. You can interconnect existing copper lines with plastic pipes, but the joints must be compatible. Additionally, if you decide to use copper pipes, ensure that their joints are lead-free to prevent chemicals from seeping into your drinking water.
In terms of bonding, opinions vary. Some sources suggest that bonding is unnecessary for plastic pipes unless the copper pipework goes underground. However, others state that bonding is required if the system could become energised or if the copper pipe runs inside walls with wiring. Ultimately, the decision to bond or not may depend on local regulations and the interpretation of inspectors.
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Regulations for bonding plastic pipes
In the past, most water pipes were made of metal, which meant they needed to be bonded to ensure electrical continuity and prevent electric shocks. However, with the advent of plastic plumbing, the regulations had to be modified. According to Regulation 411.3.1.2 of BS 7671: 2018, metallic pipes with an insulating section at their entry point do not need to be connected to the protective equipotential bonding. This is because plastic plumbing breaks the electrical continuity between the mass of Earth and the metallic pipework, rendering the pipework no longer an extraneous-conductive part.
In the United States, the National Electrical Code (NEC) takes precedence. While there is no specific code for bonding plastic pipes, inspectors may interpret the situation differently. If there is a possibility of the system becoming energized due to metal piping to a water heater or copper pipes running inside walls with wiring, bonding may be required for safety.
In the United Kingdom, regulations seem to suggest that bonding is not required for plastic service pipes unless the copper pipework goes underground. However, some electricians recommend bonding regardless of the incoming services being plastic, especially in situations with internal metal pipework, to prevent potential differences and electric shocks.
It is important to note that local regulations and inspector interpretations may vary, so it is always best to consult with a licensed electrician or local authority to ensure compliance with the latest regulations and safety standards.
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Bonding plastic pipes before installing an EV charger
Bonding plastic pipes is generally not required if the pipes are purely plastic and do not transition into copper or metal. However, when installing an EV charger, it is essential to ensure electrical safety and prevent electric shocks. Therefore, it is crucial to verify the specific requirements for your installation.
Before installing an EV charger, it is necessary to provide evidence of water and gas bonding to ensure safety and avoid additional costs. This verification process helps to confirm that the bonding is correctly installed, appropriately sized, and meets modern standards. Inspectors or electricians will typically look for a yellow and green cable attached to a copper pipe near the water stopcock or a similar setup near the gas meter.
If your property has plastic pipes that do not transition into metal, bonding is typically not required. However, it is still recommended to consult with a qualified inspector or electrician to confirm the specific requirements for your EV charger installation. They will be able to assess the unique characteristics of your plumbing and electrical systems and determine if any exceptions apply.
In some cases, older homes may have previously been fitted with bonding, even if the pipes are plastic. This was a common practice when the regulations were less clear, and it was easier to bond everything without considering the specific materials. As a result, it is always advisable to have a professional assess your property to ensure compliance with the latest safety standards.
If bonding is required or recommended by the inspector, it is essential to follow their guidance. Failure to do so may result in the inability to proceed with the EV charger installation due to safety and legal compliance reasons. Additionally, ensure that the bonding meets modern standards regarding size and distance from the pipe entry into the property to avoid unexpected costs during the installation process.
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Bonding plastic pipes to metal pipes
Bonding a plastic pipe to a metal pipe is a straightforward process, but it's a job best left to a professional plumber. If you're set on doing it yourself, you'll need to ensure that the ends of the pipes are in good condition, as these are the parts that break first. You'll also need to use specific materials, including pipe threading compound, plumbers tape, double-threaded female metal adapters, male plastic threaded adapters, PVC primer, and PVC cement. Most of these items can be easily obtained at your local home improvement store.
To begin, inspect your pipes to ensure they are in good working order. If they are not, you will need to remove, replace, or repair the damaged portions of the pipe. Once your pipes are ready, follow these steps:
- Wrap the threads of the male PVC adapter with plumbers tape.
- Wrap the interior threads of the female metal adapter with pipe threading compound.
- Place the coated threads next to each other.
- Twist the adapters to tighten them and form a solid seal. Be careful not to over-tighten, as this can damage the adapters.
- Use a pipe wrench to tighten the adapter and be cautious to avoid damaging anything breakable.
- Apply either plumbers tape or pipe threading compound to the end of the metal pipe.
It's important to note that the requirements for bonding pipes may vary depending on your location and specific circumstances. For example, in some cases, bonding may be required for metal pipes that run underground or are connected to certain appliances. It's always a good idea to consult with a professional or refer to local regulations before starting any plumbing work.
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Bonding plastic pipes to earth
Plastic is a non-conductive material, and as such, there is no formal requirement to bond plastic pipework. If all the water pipework within a property is plastic, it is not required to have a main earth bonding connection.
However, if the plastic pipework transitions to copper or metal, opinions vary on whether bonding is required. Some sources suggest that bonding is only necessary if the copper pipework goes underground or is liable to introduce an earth potential, such as when it connects to another flat. Other sources suggest that bonding is required if the copper pipework runs inside a wall with wiring or connects to an electrical appliance, as this could energize the system.
Ultimately, the decision to bond plastic pipes to earth may depend on local regulations and the interpretation of an inspector. In some cases, it may be easier to comply with the inspector's requirements to avoid potential issues.
It is important to note that bonding plastic pipes to earth is a safety measure to prevent electrical hazards. If you are unsure about the requirements or the best course of action, it is recommended to consult with a qualified electrician or seek advice from local authorities.
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Frequently asked questions
Plastic water pipes do not need to be bonded. However, if the pipe transitions into copper, it may need to be bonded. It is best to consult an inspector to determine if bonding is required.
Inspectors consider whether the system could become energised. If there is metal piping to a water heater, or the copper pipe runs inside the wall with wiring, or stubs out under a kitchen sink with an outlet, most inspectors interpret that as meaning the pipe needs to be bonded.
Yes, bonding plastic water pipes can create extra earthed exposed conductive parts within a property. In an extreme and unlikely set of circumstances, this could increase the number of live surfaces in the house in the event of an electrical fault.
