The socket strips at home may be used in the wrong way every day.

The socket strip is one of the most common electrical appliances in the home. Almost everyone uses it, but how many people have carefully read its rated parameters? Excessive power consumption, inferior sockets, stacking power banks... These daily habits may hide considerable safety risks.

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Core safety parameters: rated current and total power

Rated current is the most important parameter of the power strip, which represents the maximum current it can safely carry.

Rated current	Maximum safe power (220V)
10A	2200W
16A	3520W

Formula: Maximum power (W) = rated current (A) × voltage (220V)

Common electrical appliance power reference:

Electrical appliances	Typical power
Mobile phone charger	10–120W
Laptop	45–180W
Desktop computers	200–600W
Electric Fan	20–60W
Desk Lamp	5–60W
Electric kettle/rice cooker	800–2000W
Air conditioner (window unit plugged into socket)	600–2000W
Electric heater	1000–2500W
Hair Dryer	1200–2400W

High-risk combination: Electric kettle (2000W) + hair dryer (2200W) = 4200W, far exceeding the 2200W upper limit of the 10A power strip → potential fire hazard.

Safety Principle: High-power electrical appliances (rice cookers, electric kettles, air conditioners, water heaters) should be directly plugged into fixed sockets on the wall and should not be connected through power strips/extension cords.

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Certification mark: a must-see when buying a power strip

Power strips sold in China must have the following certifications:

CCC (China Compulsory Certification/3C Certification)

• Wires, cables, plugs, and power strips all belong to the 3C compulsory certification catalog
• Qualified products have the CCC mark (three "C"s in a circle)
• Inquiry method: You can check the authenticity of the certificate on the official website of the National Certification and Accreditation Administration (CNCA)

National Standard GB 2099.7 (Special Standard for Power Strips)

• The new national standard was released in 2017, requiring the new jack to be changed to a "new five-hole" design (the two-pole flat holes are shifted to prevent children from inserting fingers/foreign objects)
• When purchasing, give priority to products that comply with the 2017 new national standards

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Socket structural safety

Protection door (safety door)

The current national standard requires that the power strip must have a protective door - there is a shrapnel-type shield inside the jack, which can only be pushed open when two poles are inserted at the same time to prevent children from inserting their fingers or foreign objects alone.

How ​​to verify: Use a toothpick to insert only one hole. If it cannot be inserted, there will be a protective door; if it can be inserted easily, it means there is no protective door (unqualified).

Ground wire

• The upper middle hole of the three-hole socket is the grounding hole, which corresponds to the grounding pin of the plug
• Ground protection plays a protective role in electrical leakage
• Confirm whether the ground wire is truly grounded: Use a test pen to test the ground hole (the indicator light will not light up when it is correctly grounded). If you are not sure, please ask an electrician to check.

Wire cross-sectional area

The conductor cross-sectional area of the extension cord determines the maximum current that can be safely transmitted:

Wire cross-sectional area	Applicable maximum current
0.75mm²	6A (1320W)
1.0mm²	10A (2200W)
1.5mm²	16A (3520W)
2.5mm²	25A (5500W)

Inspection method: Look at the cable label. Regular products have cross-sectional area information printed on the outer skin (such as "RVV 3×1.0mm²").

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Common incorrect usage of row plugs

1. Stacking power bank

• The power bank (power bank) itself has a lithium battery. It is strictly prohibited to charge the lithium battery of the power bank through a power bank and then continue to connect it to the power bank.
• It is even more forbidden to use a power bank to power high-power devices while simultaneously overlapping a large number of the same circuit.

2. Overlapping rows of plugs ("matryoshka")

• When two power strips are connected in series, the total current can exceed the rating of any single power strip.
• Two 10A power strips are connected in series. If the total power reaches 3000W, the interface will continue to be hot.

3. Coil the extension cord and use it

• When the extension cord is in the coiled state, the internal conductors are close to each other, and the self-inductance effect causes poor heat dissipation. When the extension cord is powered on, the temperature is much higher than in the unfolded state.
• Be sure to extend the extension cord when using high power

4. For use in humid environments

• The waterproofness of ordinary power strips is IP00 (no protection)
• Kitchens, bathrooms, and terraces should use dedicated sockets with a splash-proof level of IP44 or above

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Smart sockets and USB sockets

USB charging port socket:

• Built-in charging control chip, different device protocols may be different (QC / PD fast charging)
• Make sure the USB-A/C port supports the fast charging protocol of your device, otherwise the power will be lower than expected

Smart Socket: -Support remote control and power monitoring

• Power monitoring function: You can check the actual power consumption of the device and find abnormally high power consumption
• Overload protection: automatically power off after setting the threshold

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*This article refers to GB 2099.7-2015 Single-phase plugs and sockets standards for household and similar purposes and 3C certification requirements. *