Modern homes are full of sensitive electronics — televisions, routers, computers, smart appliances and inverter air conditioners. All of them rely on delicate circuit boards that can be damaged by a sudden spike in voltage. Surge protection is an inexpensive way to reduce that risk.
What is a power surge?
A surge is a short burst of voltage well above the normal supply level. It may last only microseconds, but that is enough to stress or destroy electronic components. Smaller, repeated surges can also shorten the life of appliances gradually, without any obvious single failure.
Common causes of surges
- Lightning striking near power or communication lines.
- Grid switching when the supply is restored after an outage.
- Large motors such as pumps, lifts and air-conditioner compressors switching on and off.
- Generator changeover when backup supplies are connected or disconnected.
- Faulty wiring or loose neutral connections causing voltage imbalance.
Layered surge protection
The most effective approach uses more than one layer of protection.
1. Surge protection device (SPD) at the board
A surge protection device installed in or next to the distribution board diverts large surges to earth before they reach your circuits. It protects the whole installation, including fixed appliances such as water heaters and air conditioners.
2. Point-of-use protection
Quality surge-protected extension boards add a second layer for expensive electronics such as TVs, computers and networking equipment. Look for products with a clear surge rating and an indicator showing that protection is still active.
3. A healthy earthing system
Surge protection depends on a good earth path. If your earthing is poor or missing, an SPD cannot do its job. Earthing checks are part of every safety inspection we carry out.
Good habits during storms and outages
- Unplug sensitive electronics during severe thunderstorms if you can do so safely.
- After a power cut, wait a few minutes before switching on large appliances.
- Use appliances with built-in voltage protection where available.
- Replace surge-protected boards that have absorbed a major surge — their protection may be used up.
Signs you may have a voltage problem
Frequently failing bulbs, electronics that reset on their own, flickering lights and devices that run hot can all indicate unstable voltage or a loose neutral connection inside the installation. These issues should be investigated by an electrician, as surge protection alone will not fix them. Our electrical repair team can test and trace the cause.
Is surge protection worth it?
Compared with the cost of replacing a television, a computer or an inverter air conditioner’s control board, a board-mounted SPD and a few quality protected power strips are a modest investment. For businesses with servers, point-of-sale systems or medical equipment, it is essential.
Want surge protection fitted? Ask Elite Wire Tech to check your earthing and install the right protection for your board.