[Basement Flood Prevention Savior] Is water flooding the garage? Planning and installation of "double-circuit automatic water pump" and "basement mechanical flood control and overflow alarm system" in the Greater Taipei Building

Basement flood control shortcomings: the threat of backflow caused by insufficient drainage of urban rainwater in the Greater Taipei Basin

The Greater Taipei area is located in a basin, and coupled with the short-term heavy rainfall caused by climate change in recent years (for example, the rainfall can easily exceed 100 millimeters), when the water level of external public rainwater sewers suddenly rises, it is very easy to cause backflow. The building's basement garage, generator room, and high and low voltage distribution rooms are mostly located underground. They are the "heart area" of the entire building's electromechanical system and are also the most vulnerable line of defense against floods. Once water accumulates in the basement, parked vehicles will be reimbursed for being soaked in water. Once the high and low voltage switchboards and generators are damaged by moisture, the entire building will be paralyzed without water or power. The repair cost (CapEx) is usually as high as millions of dollars. Therefore, designing a "dual-circuit water pumping system" with redundant backup and automatic alarm functions has become the core disaster prevention power distribution project for management committees of high-asset commercial buildings and luxury homes in Taipei and New Taipei.

Redundant design safety rules: dual-circuit alternating and parallel automatic control panel (ALT Control)

In the basement sump pit (Sump Pit), you must not rely on a single pumping motor. The standard flood control electromechanical method requires two high-power sewage pumping motors and an "Alternating Relay" installed in the distribution box. When a small amount of water enters daily, the two motors will operate in an alternating mode of "one operation and one standby" to extend the life of the equipment; however, when a sudden heavy rain causes a sudden increase in water inflow and the water level rises to the "high warning line", the control panel will activate the parallel mechanism (Parallel Run), forcing the two motors to operate at full load at the same time, pumping the accumulated water to the first floor drain at the maximum displacement. In addition, the motor power supply must be designed as a "dual-circuit power supply", which is introduced from the mains power supply and the building's emergency generator backup circuit to ensure that the water pumping system can still operate normally during a power outage.

The essence of water level control: float switch and mechanical overflow relay configuration

The soul of the pumping control panel lies in water level sensing. There are usually four float switches hung in the sump, corresponding to: low water level (stop to prevent burning), medium water level (single machine start), high water level (dual machines in parallel) and ultra-high water level (overflow alarm). Hydropower experts emphasize that the length of the cable of the float switch and the position of the hanging weight must be carefully calculated to prevent the float from getting stuck on the wall of the sump or entangled with each other due to turbulent water flow. Install a set of independent "mechanical overflow relays" or water accumulation sensing needles. When the water level reaches the critical point of backflow, a text message and buzzer alarm can be immediately sent to the security building central control room or the property manager's mobile phone, so that the flood control gate can be lowered in the golden 10 minutes before the driveway is flooded.

Business asset risk control: electromechanical packaging of high-premium disaster prevention properties

For investors who specialize in asset repositioning or property management flips of old buildings, the soundness of the basement flood control system is a key indicator for buyers to evaluate the CapEx risk of the asset. Showing buyers that the basement has a dedicated flood control switchboard, dual-pump alternating redundant control, generator automatic switching loop (ATS), and an IoT overflow alarm system can instantly resolve the buyer's concerns about the building's flooding hazards, improve the property's business defense rating, and achieve higher real estate resale premiums and rental yields.

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.