[Smart Upgrade of Old Houses] Can old apartments in Taiwan be equipped with “smart sockets”? No neutral wire (single live wire), insufficient depth of poop box, construction pain points, modification budget and property valuation

Invisible obstacles to whole-house intelligence: physical limitations within the walls of old apartments

In the greater Taipei area, with the popularity of new-generation smart home protocols such as Apple HomeKit, Aqara and Matter, more and more homeowners want to replace traditional wall sockets and switches with "embedded smart outlets/smart switches (Smart Outlets & Switches)" that can be remotely monitored through mobile phones, voice controlled, and scheduled time switches when renovating or partially renovating their old houses. However, when the plumbers take apart the wall panels, they will often shake their heads and tell you: "This can't fit in, or the wiring needs to be changed significantly." More than 60% of Greater Taipei are old apartments or mansions that are more than 30 years old. The "water and electricity infrastructure" hidden inside the walls of these buildings has serious physical conflicts with modern high-tech smart hardware in terms of size and wiring.

Two major physical pain points and popular science analysis of retrofitting smart sockets in old houses

To successfully deploy embedded smart sockets or smart switches in old apartments in Taiwan, the following two major problems must be overcome:
Pain point 1. The iron wiring cassette (commonly known as the lunch box) is seriously insufficient in space:
- In the early days of Taiwan, the wiring cassettes buried in the walls of old apartments were mostly commonly known as "1P". Iron Lunch Box" (dimensions approximately 7cm × 11cm × 5cm deep), and the interior is often filled with 2.0mm single-core wires and Wago connectors connected in parallel and via jumpers from adjacent sockets.
- Inside a smart socket or smart switch panel, in order to implement wireless communication (Zigbee/Wi-Fi), relay switches and 110V to 5V transformer circuits, the modules behind them are huge and often more than 4.5 centimeters thick. If it is forcibly pressed into an old iron box that is only 5 centimeters deep, the wires inside will be severely bent and stressed, and the metal casing may even wear the outer skin of the wires, causing short circuit and leakage.
Pain point 2. "There is no neutral wire (N wire/neutral wire)" in the switch junction box:
- The smart socket body is a microcomputer and needs to be continuously powered on (L live wire + N neutral wire forms a loop) to maintain wireless communication. However, when Taiwan's traditional hydropower is configured with switch wiring, in order to save wires and man-hours, the switch only pulls one control wire (L') to the lamp. The lack of a neutral wire in the switch box can render a smart outlet or certain smart switch that requires continuous power completely inoperable.

Compliant physical renovation construction methods: how to break through the shortcomings of space and wiring

For the renovation shortcomings of old apartments in Taipei, qualified water and electricity engineering teams have the following formal solutions:
1. Solutions to the lunch box that is too shallow:
- Before entering the mud work, use a grinder to cut around the old iron box and knock off part of the rear concrete, which will be as deep as 6 The "deep plastic/metal cassette" from 1 to 7 cm is re-embedded and fixed with cement mortar. This can provide sufficient space for large-volume smart sockets to dissipate heat and route cables.
- If you don't want to damage the cement wall, you can replace the "high convex frame outside the socket" or use an exposed box. This allows the socket to protrude outward by about 1.5 to 2.5 centimeters, gaining sufficient depth without having to hit the wall, but the aesthetics will be slightly compromised.
2. Solution to the problem of no neutral wire:
- The plumber uses a stainless steel wire threader (cable tape) to pass through the light outlet hole in the ceiling, along the pipeline back to the wall switch box, and pulls an extra white neutral wire (N wire) into the switch box. This requires the pipes inside the pipe to be smooth and free of blockages.
- If the pipeline is clogged and the wire cannot be re-pulled, the switch end can be replaced with a "No Neutral Required" smart switch. The single-fire version of the smart switch uses tiny current leakage from the lamp to maintain operation. This can easily cause low-power LED lamps to produce "micro-glow or flicker" after the light is turned off. In this case, an "anti-flash microcapacitor (resistor)" must be connected in parallel to both ends of the ceiling lamp to eliminate the flicker. And single live wire technology cannot be used for high-power sockets, but can only be used for small current switches.

Shuangbei smart socket modification water and electricity salary and budget market

To upgrade smart home sockets and switches in Shuangbei area, the budget can be planned according to the following labor and material distribution:
* The individual price of embedded smart sockets or smart switch panels is approximately between NT$ 800 to NT$ 1,800, brands such as Aqara, TP-Link, Lutron, etc.
* The cost for a master to replace a basic panel is about NT$ 500 to NT$ 800 /piece (usually there is a basic labor fee of NT$ 1,500).
* Depending on the difficulty and length of the pipeline, the salary for each line of cable pulling is approximately NT$ 1,500 to NT$ 3,000/way.
* Including trench cutting, wall digging, replacement of deepening boxes and cement filling, the cost per location is approximately NT$ 2,500 to NT$ 4,500.

Commercial acquisitions and businessmen’s long-term asset thinking: Smart power outage systems can reduce costs and increase ROI in long-term rentals and hosting

For commercial real estate businessmen who specialize in acquiring old apartments in Shuangbei Liedi, converting them into modern high-tech apartments or leasing them, . In actual charter operations, the most common risk is that tenants fail to turn off high-power electric heaters and dryers when they go out. This will not only cause the monthly utility bill to increase by 15% - 25% and erode profits, but also risk the tenants causing fires and destroying assets due to drying clothes. Businessmen deployed smart sockets in the early stages of renovation and set up smart scripts that "when guests go out (with human body sensors or smart door locks), high-power sockets other than refrigerators will automatically cut off power." This can not only save energy costs, but also eliminate electrical fire hazards. In addition, the "future technology apartment" brand packaging with HomeKit and Matter voice control has great marketing appeal among the young tech-savvy and foreign office workers in Shuangbei. It can bring about a rental premium of about 10% to the property and significantly shorten the rental vacancy period. It is a smart investment method for the restructuring and upgrading of modern real estate assets.

The Ministry of Economic Affairs' latest "Regulations on Consumer Electrical Equipment Installation" and the key points of electricity safety in old houses

Due to the popularity of high-power household appliances (such as air fryers, microwave ovens, dishwashers, instantaneous electric water heaters, and IH furnaces) in recent years, the Energy Administration of the Ministry of Economic Affairs has revised the "Regulations on Consumer Electrical Equipment Installation" many times to strictly require the diversion and protection mechanisms of residential electricity circuits. Statistics show that more than 30% of building fires in Taiwan are caused by electrical factors, among which "old wire insulation deteriorates and short circuits", "socket contacts are oxidized and loose, poor contact" and "non-fuse switch (NFB) overloaded and failed to trip" are the three main fatal causes.

Old apartments in Shuangbei that are more than 30 years old have a total original designed power capacity of only 30A to 40A, and several rooms often share the same 1.6mm or 2.0mm circuit. In the modern standard safety configuration, kitchen electrical cabinets, bathroom equipment, and air-conditioning and heating machines must all be equipped with 5.5mm² dedicated circuits (single circuit and single socket). It is recommended that the main switch box be upgraded to a busbar (Busbar) integrated distribution board, and the total amperage is increased to 75A or 100A (a qualified electrical appliance contractor needs to be entrusted to Taipower to review the additional power capacity).

Residential electricity self-test and regular inspection checklist

• Appearance and temperature of the socket: Touch the outer cover of the commonly used socket lightly with the back of your hand. If it feels lukewarm or if you find that the plastic socket is yellowed and charred, or the plug is loose and shaking after being plugged in, it means that the internal copper plate clamping force is exhausted or the contact resistance is too high, and you should immediately cut off the power and replace it.
• Regular testing of leakage circuit breakers (ELCB): For leakage circuit breakers in humid places such as balconies, bathrooms, and kitchen sinks, regulations require that the "TEST button" on the switch be pressed once every 1 to 3 months to confirm that it can automatically trip and cut off the power supply instantly.
• Serial connection and overloading of extension cords are strictly prohibited: Extension cords should be purchased with 2.0mm thick wire diameter products that have CNS certification and automatic overload power-off protection. Do not share the same extension cord with high energy-consuming appliances to ensure zero hidden danger to life and property at home.