For the items you can't leave unplugged, invest in high-quality surge protectors. They work by monitoring the flow of electricity and diverting excess voltage either back into the system or to the ground.
There are two types of surge protectors - to fully protect your electronics, using both types is a must.
Point-of-use surge protectors
A "point-of-use" surge protector guards individual devices from lower-level internal fluctuations.
You may have equipment plugged into a multi-socket power strip, but it's important to realize that many of these devices function simply as extension cords, providing little or no protection against power surges.
The adage "you get what you pay for" very much applies to surge protectors, with prices ranging from $5 to more than $150.
Here's what to look for: - Enough connections to protect all components of a system.
- An on/off switch allowing you to shut off power to every component.
- UL-1449 rating to ensure adequate testing by Underwriters Laboratories. Look for a specific UL rating, not just a label that says "UL Listed."
- An indicator light or audible alarm so you know a high-level surge has occurred.
- A clamping voltage of 330. This is the level at which the device begins to block the surge - the lower the clamping voltage, the better.
- The total energy dissipation - the higher the better.
- A joule rating of at least 400 is good; 600 is better. This is a measure of the ability to absorb surges.
- A response time of 10 nanoseconds or less.
- Protection between all three wire combinations: L-G, N-G, L-N.
- A warranty against damage to any connected equipment. Keep in mind that no surge protector will be fully warranted against lightning strikes.
- Filters for line noise, also known as electromagnetic interference.
Whole-house surge protectors
To protect against large external power surges, a whole-house protector is key. These devices cost around $150 to $300, and are installed on your meter or service panel by a licensed electrician. |
 Did you know?
Power surges can
travel through
phone, cable
and satellite lines.
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