20A 멀티탭 으로 에어컨 기사님이 구입하래요 ?

Why Am I Being Told to Buy a 20A Power Strip for an Air Conditioner?

Before installing an air conditioner, many people hear a recommendation like, “Please prepare a 20A power strip.”
When you search for this online, however, the information quickly becomes confusing.
20A power strips are hard to find, it is unclear what they really are, and customer service centers receive questions about them every year.

So why are technicians asking for a “20A power strip” in the first place?

What Does “High-Capacity” or “20A” Really Mean?

The standard household electrical environment in South Korea is 220V, 60Hz.
Most household outlets, plugs, extension cords, and power strips are designed for a rated current of 10A to 16A.

These numbers are not arbitrary. They are based on the thickness of household wiring, the structure of wall outlets, and the capacity of circuit breakers.

In general, household power strips and extension cords are managed under KS standards and KC safety certification, with a maximum rating of 16A.
In other words, power strips that can be legally sold and normally purchased by consumers are products that have passed safety tests within this 16A range.

A so-called “20A power strip” does not fit into this system. There is no applicable regulation for it, and it cannot receive KC certification.

Why a 20A Power Strip Cannot Receive KC Certification

A 20A power strip is not excluded because it is inherently “too dangerous,” but because there is no legal or institutional framework to evaluate it.

In South Korea, any electrical product that is manufactured, imported, or sold must comply with the Electrical Appliances and Consumer Products Safety Control Act and obtain KC certification or safety confirmation.
All test standards, including rated current, short-circuit protection, heat resistance, and durability, are clearly defined based on KS standards.

The problem is that 20A-rated power strips fall outside those defined ranges.
Since all evaluation criteria are designed around 16A or lower, there are no applicable test items for a 20A-rated product.

As a result, a 20A power strip becomes a product that technically requires KC certification, but cannot obtain it because no certification criteria exist.

This is why many products labeled as “20A” are, in reality, 16A products sold with misleading specifications.

Why Air Conditioner Technicians Recommend “20A”

Then why does the recommendation still come up at installation sites?

This is usually not an individual technician’s fault, but a result of how on-site training is conducted.
Technicians are often trained by senior installers with a strong focus on practical experience.

They learn that the wiring behind wall outlets is typically 2.5 sq or thicker, and that such wiring can theoretically handle up to 20A.
From there, the logic often becomes:
If the wire is 20A-capable, then the power strip should also be 20A.

What is missing in this logic is a critical point: electrical safety is not determined by a single component.

Even if the internal wiring could theoretically handle 20A, once you consider the outlet structure, plug contact points, internal components of the power strip, and the certification system as a whole, 16A is the realistic upper limit for household use.

This gap explains why 20A is recommended in the field, while legally and practically such products cannot properly exist in the consumer market.

The Risk Becomes Clear When You Look at the Numbers

Looking at the numbers makes the issue easier to understand.

At 220V, 20A corresponds to about 4,400W of power.
In most homes, the main circuit breaker is rated around 30A, or about 6,600W.
Even in larger apartments, it is typically 40A, or about 8,800W.

This means that using over 4,000W from a single power strip does not align with how household electrical systems are designed.

In addition, most individual room circuits are protected by 15A or 16A breakers.
Even if a power strip could theoretically handle 20A, the breaker or internal wiring would limit the current first.

Under these conditions, heat can accumulate at plug and contact points, increasing the risk of deformation, overheating, and fire during prolonged use.

That is why, when choosing a power strip for home use, the rated current number is far less important than safety certification, internal structure, contact quality, and overload protection design.

What Consumers Should Actually Look For

It is not easy for consumers to fully understand complex electrical standards and regulations.
So a practical set of guidelines is more helpful.

First, always check that the product clearly has KC safety certification.
Second, focus less on the rated current number and more on features such as overload protection, leakage protection, heat-resistant materials, and internal wiring quality.
Third, for high-power appliances such as air conditioners, dryers, and electric heaters, direct connection to a wall outlet should be the basic rule whenever possible.

If a power strip must be used because the wall outlet is too far away, choose a high-quality power strip with built-in leakage and overload protection to compensate for the added risk.

Final Thoughts on “20A Power Strips”

A few years ago, some sellers faced large-scale penalties for marketing power strips labeled as 20A.
Even today, some vendors continue to use the 20A label simply because consumers search for it, not because it is technically or legally valid.

A power strip may look like a simple product, but it is one of the most fundamental components of electrical safety.
Choosing a product from a brand with long experience in manufacturing power strips can significantly reduce unnecessary risk and confusion.

So even if an air conditioner technician recommends a “20A power strip,” do not automatically trust listings you see on platforms like Coupang or Naver Shopping.
Rather than blindly following what someone else says, having a basic understanding of what you are using is ultimately the safest choice.