I need to conduct a survey on the household power supply situation here. This is a question about the strong and weak electrical systems of your house. The specific questionnaire content is as follows:
Does your house have both strong and weak electrical systems? Did they exist before you acquired this house or did you install them later? Is this a common phenomenon in your country? Please tell me which country you are living.
If so, do you understand how weak electrical systems are converted from strong electrical systems? For example, what kind of transformer equipment did it use? Is it just a simple transformer winding or are there other designs for voltage regulation or protection circuits? Can you show me a physical photo of the transformer equipment ?(preferably including the nameplate content of the equipment, so that I can understand the power specifications)
What is this weak current system used for? For example, driving mechanical doorbells, auxiliary lighting, etc., what else?
Do you have a way to measure the voltage/current fluctuations of this weak current system? Is power outage or voltage fluctuation a common occurrence in your country/region? What is its frequency? Has it had any impact on other electrical devices in your home?
@Aqara_PM_Donie Hello! Thanks for initiating this survey on household power supply—it’s a great topic to explore. Unfortunately, the reference information we have doesn’t cover details about strong and weak electrical systems, their conversion methods, transformer equipment, or measurement of weak current fluctuations.
That said, I’m sure many community members have real-world experiences to share! If you’re based in a specific country or have insights into local practices, feel free to chime in. Your input could help the survey gain valuable data.
If you have follow-up questions related to Aqara devices in the future, we’re here to assist. Happy surveying!
1. Do Norwegian houses have both strong and weak electrical systems?
Yes, most Norwegian homes have both strong and weak current systems.
Strong current (230/400 V AC): This is the normal power supply for outlets, lighting, heating, and appliances.
Weak current (typically 12–48 V DC or low-voltage AC): Used for signal systems such as internet, telephone, fire alarms, intercoms, and doorbells.
2. Did these systems exist before you acquired the house, or were they installed later?
In modern houses, both systems are built in from the start.
In older houses (built before around 1980–1990), weak-current systems were often added later — for example, when upgrading to broadband, alarm systems, or smart home controls.
3. Is this common in Norway?
Yes, it is very common.
Norway has a highly developed and regulated electrical system. The separation between strong and weak current installations is a requirement under the Norwegian electrical code (NEK 400) for safety and signal integrity reasons.
4. How is weak current converted from strong current?
This is done using transformers or power supplies:
Usually, an electronic switch-mode power supply converts 230 V AC to low voltage (e.g., 12 V DC or 24 V DC).
Older systems might use simple wound transformers with a rectifier and filter.
Modern supplies also include voltage regulation, surge protection, and thermal safety circuits.
A typical example (no photo, but description):
Mean Well HDR-30-24, Input: 230 V AC, Output: 24 V DC 1.25 A, DIN-rail mounted.
5. What is the weak current system used for?
Common applications in Norwegian homes include:
Doorbells and intercoms
Access control systems
Fire and burglar alarms
Internet and network equipment (routers, fiber boxes, PoE)
Smart home and automation systems
Low-voltage LED lighting (12/24 V)
6. How can voltage or current fluctuations be measured?
You can use:
A multimeter (for voltage, current, and continuity)
An oscilloscope (for noise or small fluctuations)
Smart home monitoring systems, which often log power supply variations automatically.
7. Are power outages or voltage fluctuations common in Norway?
No, the Norwegian power grid is very stable:
Power outages are rare (maybe 1–3 times per year in rural areas, even less in cities).
Voltage variations are very small (usually within ±5% of 230 V).
Impact on equipment: Normally none – but sensitive electronics often have surge protectors or UPS systems for additional protection.
1. Do Norwegian houses have both strong and weak electrical systems?
2. Did these systems exist before you acquired the house, or were they installed later?
3. Is this common in Norway?
4. How is weak current converted from strong current?
5. What is the weak current system used for?
6. How can voltage or current fluctuations be measured?
7. Are power outages or voltage fluctuations common in Norway?
Summary Table