[Old House Safety] Is there a "burning smell" in your home? 5 life-threatening warning signs of aging wires in old houses, don’t wait for a power outage to deal with them!

Foreword: Invisible threats to homes

A very high proportion of old apartments in Taiwan are over 30 years old. When most homeowners renovate, they tend to invest their budget in visible carpentry, tiles or bathroom equipment, but ignore the "blood vessels" buried deep in the walls that govern the safety of the whole home - electrical wires. According to statistics from the Fire Department, "electrical factors" have always ranked first among the causes of building fires in Taiwan. Aging wires not only cause inconvenience in power tripping, but are also an invisible killer that directly threatens lives and property.

The first warning sign: plastic smell or "burnt smell" from unknown source

This is an extremely dangerous signal. When the wire is overloaded, the insulation is aged and brittle, or the wiring is loose, high temperatures will occur locally. When the heat is high enough to melt the PVC insulation on the wires or the plastic parts inside the sockets, a faint but pungent burnt smell is released.

Professional analysis: This smell usually occurs during peak electricity consumption (such as when the air conditioner is fully turned on in summer or the heating is turned on in winter). If you smell this smell, be sure to inspect the switchboard and high-consumption sockets immediately. Do not assume that the smell is just coming from outdoors.

The second major warning sign: the socket is discolored, hot or vibrating

A properly functioning socket should not be noticeably hot. If you feel warm when touching the socket panel, or if you find yellowing or charred marks around the socket, it means that the internal contact pieces have become loose or oxidized, causing excessive contact resistance and heat generation.

Arc phenomenon: Sometimes you will hear a "pop" sound or see weak sparks when plugging or unplugging electrical appliances. This is arcing (Arcing) caused by unstable circuits. If the environment is humid or dust accumulates (dirt conducts electricity), it can easily ignite surrounding flammable materials.

The third major warning sign: the lights flicker on and off or flicker abnormally

Excluding the situation where the life of the bulb has expired or the Taipower power supply is unstable. If multiple lamps in the home flicker at the same time, it usually means that the main connector of the indoor switchboard (main switch box) is loose, or the voltage of the main wire is unstable due to aging.

Key risks: If this situation is not dealt with, long-term voltage fluctuations will shorten the life of precision appliances such as computers and refrigerators. In severe cases, the voltage may suddenly increase to 220V due to loose neutral wires, damaging all 110V appliances in the house.

The fourth major warning: Frequent power tripping or abnormal no-fuse circuit breaker

"Power tripping" is a self-protection mechanism of the circuit, which means that the power consumption has exceeded the load. However, if the power trips frequently, in addition to excessive use of the electrical appliance, it is more likely to be:

• Aging of the no-fuse circuit breaker (Breaker): The internal spring is tired, causing the circuit breaker to trip before the load is fully loaded, or the fault causes overheating.
• Activation of leakage circuit breaker: It means that there is leakage in a circuit or electrical appliance in the home.

Note: It is strictly prohibited to replace the circuit breaker with a larger amperage due to frequent power tripping. This will prevent the wire from tripping before a fire occurs, causing a greater disaster.

The fifth major warning sign: old distribution box configuration and thin wire diameter

In early buildings (before 80 years of the Republic of China), 1.6mm solid wires were mostly used for indoor power distribution, and there were very few power circuits. Modern home appliances such as air fryers, dishwashers, and dehumidifiers often exceed 1000W.

Current Standards: Current specifications recommend that socket circuits should use wire diameters above 2.0mm. If you check the electrical box in your home and find that it is still of an old configuration, or the brand of wires is no longer available, it means that the system has already "overaged" its service life.

Summary: Professional suggestions for replacing electric wires in old houses

Plumbing and electricity experts recommend that houses over 20 years old should undergo a professional circuit health inspection every 5 years; if the house is over 30 years old, it is strongly recommended to carry out "whole house electric wire replacement (wire replacement project)". This is an investment to buy "safety", ensuring that while enjoying the convenience of modern technology, the safety of your family also has a solid backing.

New knowledge on air-conditioning power consumption and Taiwan climate maintenance regulations in recent years (2025-2026 current situation)

With the high temperatures in summer breaking historical records and the adjustment of electricity price structure in recent years, the latest statistics from the Energy Administration of the Ministry of Economic Affairs show that air-conditioning equipment accounts for more than 47% of residential electricity consumption in summer. Many people mistakenly believe that if the air conditioner is not cold, they only need to "replenish the refrigerant." However, in fact, refrigerant is not naturally consumed during normal operation in a closed circuit. If the refrigerant is insufficient, it means that there are micro leaks in the copper pipes or joints. Simply replenishing the air conditioner will only treat the symptoms but not the root cause. Refrigerant leakage will aggravate the high temperature overload of the compressor and shorten its service life.

According to Taiwan's standard operating specifications for air-conditioning projects, it is recommended that professional technicians with a refrigeration and air-conditioning decoration technician license perform "full machine high-pressure water washing and evaporator deep sterilization" every 1 to 2 years for detached air-conditioning indoor units. Especially in the humid summer in the Shuangbei Basin, the air drum and water collection tray are easy to breed black mold and jelly-like biofilm. This is also the main reason for the sour smell in the air-conditioning outlet and the backflow of the drainage pipe. Regular maintenance can maintain CSPF (Air Conditioning Seasonal Performance Factor) level one energy efficiency level, which can save an average household 15% to 20% of air conditioning electricity bills every year.

Autonomous simple maintenance vs professional maintenance safety red line

• Homeowners can do by themselves: Remove and clean the nylon filter regularly every 2 to 3 weeks (rinse with clean water and dry in a cool place, do not expose it to the sun to avoid deformation and embrittlement); clean the air outlet blades of the indoor unit with a dry cloth; check whether there is any accumulation of debris within 50 cm around the outdoor unit that hinders heat dissipation.
• Professional technicians must be entrusted according to regulations: Refrigerant pressure testing and leakage repair welding, high-pressure cleaning of indoor unit air drums and aluminum fins with liquid chemicals, reset of the drainage slope of hidden cold water pipes in the ceiling, and 220V dedicated power circuit configuration and leakage circuit breaker replacement.