Installing an EV Charger at Home: Circuit 2, a Safe Option for Typical Homes

Installing an EV Charger at Home: Circuit 2, a Safe Option for Typical Homes

After introducing Circuit 1 — the Maximum Safety & Power Circuit, which is suitable for homes with a large electricity meter that want to charge at maximum power — many people often ask, "If our home doesn't have such a large meter, can we still install an EV Charger?"

This is a question we hear all the time from homeowners across the country. In fact, most homes in Thailand weren't designed for high loads from the outset, but they can still have a charger installed safely if the electrical system is planned properly from the start.

That's why "Circuit 2" was developed as the standard option for typical homes: no need to upgrade the meter, no extensive rewiring, yet it still meets full safety standards — and, most importantly, it clearly separates the charger circuit from the existing electrical system.

In this article, we take an in-depth look at Circuit 2 — who it suits, what its components are and why it is a practical choice for most homes.

Circuit 2: Standard Setup — systematic load separation for peace of mind

Even if your home doesn't have a large meter, a charger can still be installed safely. This circuit is designed to reduce the impact on your home's electrical system, prevent voltage drops when several appliances are used at once, and help the EV charger operate continuously and last longer.

This circuit system consists of the following key components

1. Current control (Breakers)

The first thing we consider is controlling the current properly

• 50A main breaker: sufficient for typical homes without very high loads, and able to support a separate circuit for the EV charger safely. It controls the overall electrical load of the whole home.
• 40A sub-breaker dedicated to the charger: acts as a dedicated power path for the charger, helping the charging system run stably without interfering with other circuits, even when several appliances are used at the same time.

2. The right cable size

A 16 sq.mm cable can handle continuous power delivery for many hours without heat build-up. It is a suitable size, striking a balance between safety and value for typical homes.

3. Earthing system to standard (Ground Rod)

A correct earthing system is a key element of safety, because it allows abnormal current to be discharged to earth immediately, reducing the risk of equipment damage and making it safer for users.

4. RCD Type B — essential shock protection for an EV Charger

As with Circuit 1, we install a Type B residual current device (RCD) to protect against both AC and DC leakage current that may arise from an EV charging system. This is an international standard that should not be overlooked.

Why is Circuit 2 suitable for typical homes?

Because it is a circuit that doesn't require additional electrical capacity or a larger meter, yet still provides full safety. It also has many other advantages, such as:

• Clear load separation that doesn't interfere with household electricity use
• An uncomplicated system that helps reduce overall costs
• Supports continuous daily charging
• Meets standards and is safe

This is a circuit that really works and suits most types of homes in Thailand.

Let EV Easy Thailand take care of your home charging system

For us, EV charger installation isn't just about installing a single piece of equipment — it's about making the whole home's electrical system work together safely. Our team is ready to check your meter and existing electrical load and choose the most suitable circuit for you, whether Circuit 1 or Circuit 2, so that every charge is worry-free and reliable over the long term.

As well as installation services, EV Easy Thailand is also a home EV charger supplier, offering consultation and complete support, from choosing a charger to installation and safety checks, so you can be confident in the quality and safety every time you use it.