All you need to know about high-voltage connections: the power behind your business and your electric vehicles

Published: 18 March 2025

You're adding EV chargers. You need power. Lots of it. Standard electricity might not cut it. That's where high-voltage connections come in. They're the backbone of powering your business, especially if your business involves EV charging. However, high-voltage connections are complex. They involve regulations, technical knowledge, and careful planning. Let’s break down the basics and explain what you need to know about high-voltage connections, why they matter, and how to avoid costly mistakes.

Think of it this way: your business is growing, electric vehicles are becoming more common, and your energy demands are increasing. You might be running a large office, a manufacturing facility, or a fleet of electric vehicles. All of these require significant power; a standard electricity supply may not be enough.

High-voltage connections deliver the power you need. They bring electricity to your business at a higher voltage, which allows you to power more equipment and handle larger loads. This is especially important for rapid EV charging. Rapid chargers need a high-voltage supply as they deliver a lot of power quickly which lets electric vehicles charge faster. Without a high-voltage connection, rapid charging may not be possible.

High-voltage connections are not a simple project. They require specialised knowledge and expertise. Incorrect installation can be dangerous and costly. That's why understanding the basics is important.

We’ll provide you with a clear overview of high voltage connections and discuss the process, regulations, and potential challenges. Through Group company Utility Line, we can also help you manage all your high-voltage connection needs.

What do we mean high-voltage connections?

You're probably familiar with the standard electricity supply in your home or office. This is typically low voltage. High voltage is different because electricity delivered at a much higher potential. Think of it like a water pipe; low voltage is a small pipe and can only carry so much water, but high voltage is a large pipe and can carry a much greater volume. In the same way, high-voltage connections deliver a much larger amount of electricity. Electricity is measured in volts (v) and kilovolts (kV), where a kilovolt is a thousand volts. Standard UK domestic supply is around 230v; high voltage can be several thousand volts.

So, why do you need high voltage? The key reason is power. As your business grows, so does your power demand. Standard low-voltage connections might not be enough as they can't handle the load. High-voltage connections provide the capacity you need and can power large equipment, multiple EV chargers, and other high-demand applications. Think of a large factory that needs lots of power for its machinery. Or consider a commercial EV charging station that needs to supply power to multiple chargers simultaneously. These are perfect examples where high-voltage connections are essential.

High voltage is also more efficient for transmitting electricity over long distances because less energy is lost during transmission. This is important for grid stability. It also means lower operating costs for your business. High-voltage connections are not just about more power, they're also about efficient power delivery. This is important for sustainability and cost-effectiveness – it's a smart investment for the future of your business.

The process from application to activation

Getting a high-voltage connection isn't as simple as plugging in a new appliance, it’s a multi-step process. You'll need to work with your distribution network operator (DNO), who manage the local electricity grid.

First, you'll need to do some planning. This involves assessing your power requirements to determine how much power you need and where the connection will be located. We can help you with this stage by analysing your needs and developing a suitable plan.

Next, you'll submit an application to your DNO. This application will detail your project and your power requirements. The DNO will review your application and assess the impact on the existing grid. This process can take some time, so be prepared for potential delays.

Once the DNO approves your application, the design phase begins. This involves creating detailed plans for the connection, such as the route of the cables, location of equipment, and safety measures. Again, we can help you here, with necessary expertise to design efficient and compliant high-voltage connections and check, test and prepare the land where you aim to lay the cables.

After the design is approved, the construction phase starts. This involves digging trenches, laying cables, and installing equipment. This work needs to be done safely and correctly and requires specialised contractors. We can manage this process for you and ensure work is carried out compliantly and to the highest standards.

Finally, the connection is tested and commissioned. This ensures everything is working correctly and safely. The DNO will then connect your business to the high voltage grid. This is the activation stage, and you can now use your new high-voltage connection.

Remember, this is a simplified overview. Each project is different and specific steps and timelines will vary.

How to navigate the red tape and regulations while staying compliant

High-voltage connections are heavily regulated – and for good reason. Safety is paramount. Incorrectly installed high-voltage equipment can be dangerous and lead to serious accidents. That's why it's essential to comply with all relevant regulations, some of which are complex and constantly changing. Keeping up with this can be a challenge, but we stay up to date on all the latest legislation and guidance to ensure your high-voltage connection complies with all legal requirements.

One of the key regulatory bodies is the distribution network operator. They own and operate the local electricity grid, and you'll need their approval for your high-voltage connection. The DNO has specific requirements for design, installation, and testing. These requirements can vary depending on your location and the size of your connection. Adhering to these requirements is essential as failure to do so can result in delays or even rejection of your application.

Beyond the DNO, there are other regulations you need to consider. These include health and safety regulations, electrical safety standards, and building regulations. These regulations cover everything from the design of the connection to the safety of the workers installing it. Compliance with these regulations is not just a legal requirement, it's also a moral obligation that protects your employees, your customers, and the public. Ignoring these regulations can have serious consequences such as fines, legal action and reputational damage.

Navigating this regulatory landscape can be tricky and requires specialised knowledge and experience. With a comprehensive understanding of the regulations, we can take the burden off your shoulders. We’ll handle the paperwork, liaise with the authorities, and ensure your high-voltage connection meets all necessary standards. This gives you peace of mind, leaving you to focus on your business with the knowledge that your high-voltage connection is safe, compliant and reliable.

Avoiding costly pitfalls

High-voltage connections can be complex projects and often come with unexpected challenges. Being aware of these challenges can help you avoid costly pitfalls.

One common challenge is long lead times. Getting the necessary approvals from the DNO can take time. Construction work can also be delayed due to weather, material availability or contractor schedules. It's important to factor in these potential delays when planning your project. Don't underestimate the time it takes to get high-voltage connections up and running.

Another challenge is cost. High-voltage connections are a significant investment, and the costs can be higher than you initially anticipate. There could also be unexpected expenses, such as additional civil works, environmental surveys, upgrades to the existing grid, or changes in regulations. It's crucial to have a detailed cost estimate before starting the project. Work with experienced professionals who can accurately assess the costs involved. Don't cut corners to save money. This can lead to problems later, which can end up costing you more in the long run.

Technical complexities can also pose a challenge. High-voltage connections require specialised knowledge and expertise. The design, installation and testing of these connections are complex processes. It's essential to work with qualified engineers and contractors who have experience with high-voltage systems. Trying to handle these technical aspects yourself can be risky and lead to errors, delays, and safety hazards.

Coordination with multiple stakeholders is another potential challenge. You'll need to work with the DNO, contractors, local authorities and other stakeholders. This can involve a lot of communication and coordination – and managing these relationships effectively is essential for the success of the project. Poor communication can lead to misunderstanding, delay and conflict. It's important to have a clear communication plan in place.

By being aware of these potential challenges, you can take steps to mitigate them. Working with experienced professionals will help you navigate these challenges. We can help you plan your project effectively, manage costs, handle technical complexities, and coordinate with stakeholders.

Your partner in powering the future

You don’t have to navigate the hugely complex world of high-voltage connections alone. We offer a comprehensive range of services to cover every stage of the high-voltage connection process, from initial planning through to final activation. Our expertise ensures your project runs smoothly and efficiently.

Consultation and planning: We’ll work with you to understand your power needs and develop a tailored plan that considers current requirements and future growth. Our goal is to create a solution that meets your specific needs.
Installation and commissioning: Our qualified engineers and technicians have extensive experience with high-voltage connections. They'll ensure your high-voltage connection is installed correctly and tested thoroughly.
Project management: We’ll manage the entire project from start to finish, including coordinating with the DNO, managing contractors, and overseeing construction. Our experienced project managers will keep your project on track and within budget.
Ongoing maintenance: We don’t just leave you after installation. High-voltage connections require regular maintenance to ensure optimal performance, and we’re here to respond to any issues or emergencies too.

We’re more than just a contractor; we’re a trusted partner, committed to helping you power your business effectively and sustainably. Our expertise in high-voltage connections allows you to focus on what you do best. Let us handle the complexities of your power supply.

Powering your business with confidence

A reliable power supply is the backbone of any successful business. High-voltage connections are essential in many cases – such as EV charging – as they provide the power you need to grow and thrive.

However, getting a high-voltage connection is not a simple project and the complexities involved should not be underestimated. Trying to handle it yourself can lead to expensive mistakes, frustrating delays and dangerous hazards. This demands specialised knowledge and expertise, so working with experienced professionals is critical for safety, compliance and efficiency to maximise the investment in your company’s future.

Have a project in mind? We’re here to help. Contact us to discuss your requirements or environmental challenges in more detail and arrange next steps. For more about Group company Utility Line, visit their website.