1) Voltage : You need voltage stabilizer . If your stabilization need not be uninterrrupted you can us a simple equipment as Relay type voltagestabilizer. This is suitable for refridgerators, Televisions. But if your equipment requires that ther is no interruption when correcting the voltage then you require stabilizers as Servo or Constant Voltage Transformer (CVT). computers, Zerox machines require such power conditioning equipments.

2) Availability: If you need to ensure continous power to protect your work then you need Uninterrupted Power Supply (UPS) . These come with inbuilt battery and ensures the power is continued to your system even when the main power supply is not available. Computers require this type of protection.

3) Power Line Surges and Spikes: Most electronic equipments as your television, Computers are sensitive to spikes on the power lines and need to be protected. Spike busters arrange protection to your equipment under this condition.