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Whole-house surge protectors are highly effective at safeguarding your home’s electrical systems and devices from sudden voltage spikes. Unlike standard power strips, which offer minimal protection, whole-house surge protectors are designed to handle electrical issues arising from everything from lightning strikes to the wear-and-tear of large appliances cycling on and off. These devices work by diverting excess voltage away from your home’s wiring, preventing potential damage to your valuable electronics and appliances.
In this article, we’ll explore how power surges happen, the different types of surge protectors you can use, and why whole-house surge protectors are a smart and cost-effective choice. We’ll also cover how to install them and give you tips on picking the right one for your home.
Understanding Power Surges and Their Causes
Power surges are brief spikes in electrical voltage that can damage or destroy electronic devices. These surges can originate from various sources, both external and internal to your home. Lightning strikes are perhaps the most well-known and feared cause of power surges, capable of sending tens of thousands of volts through power lines and into homes. However, lightning-induced surges are relatively rare compared to other causes.
More common sources of power surges include the following:
- Cycling of high-power household appliances like air conditioners and refrigerators
- Downed power lines
- Faulty wiring within the home
- Sudden changes in electricity use by nearby industrial facilities
Even minor power fluctuations, while not immediately noticeable, can cause cumulative damage to electronic devices over time. “You might not even notice it,” says Andy Ligor, a consultant with A.M.I. Systems Inc., a firm that installs both residential and commercial surge-protection systems. “Then a year or so later your microwave stops working.”
In this video, This Old House master electrician Scott Caron talks surge protection and how to protect appliances.
Types of Surge Protectors
Effective surge protection typically involves a two-pronged approach: whole-house suppressors for major spikes and individual circuit protectors for vulnerable devices.
Whole-House Surge Protectors
Whole-house surge protectors are the first line of defense against external power surges. These devices are installed directly at the main electrical panel and are designed to intercept large voltage spikes before they enter your home’s wiring system.
A Surge Protector We Recommend
Courtesy AmazonIntermatic Whole Home Surge Protector
- $149
Prices taken at time of publishing.
Key features of whole-house surge protectors include:
- Capacity to handle surges of 40,000 amps or more
- Hard-wired installation by a licensed electrician
- Protection for all circuits in the home
- Indicator lights or alarms to signal when the device has been activated
While highly effective, whole-house suppressors may allow up to 15% of excess voltage to pass through, which is why additional protection at the device level is often recommended. Whole-house surge protectors range from $70 units not much bigger than a computer mouse to $350 units the size of a pizza box that guard all the components in a home theater.
Power Strip Surge Protectors
Power strip surge protectors are the most familiar type to many homeowners. These devices plug directly into wall outlets and provide multiple sockets for connecting electronics. However, not all power strips offer surge protection, and the quality can vary significantly.
A Power Strip We Recommend
Courtesy AmazonPanamax Power Strip
- $229
Prices taken at time of publishing.
When selecting a power strip surge protector, look for these qualities:
- UL 1449 certification
- A clamping voltage of 400 volts or less
- Energy absorption rating of at least 600 joules
- Protection for all three lines: hot, neutral, and ground
Quality power strip surge protectors typically cost between $20 and $70, depending on their features and capacity.
Uninterruptible Power Supply (UPS)
An Uninterruptible Power Supply (UPS) offers the most comprehensive protection for sensitive electronics. These devices not only guard against surges but also provide battery backup power during outages, allowing you time to safely shut down equipment.
A UPS We Recommend
Courtesy AmazonAPC UPS Sine Wave Battery Backup
- $229
Prices taken at time of publishing.
UPS systems offer several advantages:
- Complete power conditioning to eliminate minor fluctuations
- Short-term battery power during outages
- Protection for data and equipment during sudden power loss
UPS devices are particularly valuable for computers, servers, and other critical electronics. Prices for UPS systems typically range from $100 to $350, depending on their capacity and features.
Key Features To Look For in Surge Protectors
When shopping for surge protectors, several key features can indicate higher quality and more effective protection:
Response Time and Clamping Voltage
Response time refers to how quickly a surge protector reacts to a voltage spike. The best protectors respond in less than a nanosecond. Clamping voltage is the threshold at which the protector begins to divert excess voltage. Lower clamping voltages (400 volts or less) provide better protection for sensitive electronics.
Joule Rating
Surge protectors are rated based on their ability to absorb energy, measured in joules. A higher joule rating indicates greater capacity to absorb surges over time. For whole-house systems, look for ratings between 20,000 and 40,000 amps. For plug-in protectors, a minimum of 600 joules is recommended, with higher ratings offering better protection.
UL Certification
UL (Underwriters Laboratories) certification ensures that a surge protector meets specific safety and performance standards. Look for devices that meet UL Standard 1449 (second edition or later) for the most up-to-date protection.
Indicator Lights and Alarms
Quality surge protectors often include lights or alarms that indicate when the device has absorbed a surge or is no longer functioning. This feature is crucial, as surge protectors can wear out over time without showing visible signs of damage.
Common Misconceptions About Surge Protection
Many homeowners have misconceptions about surge protection that can leave their devices vulnerable. One common myth is that surge protectors last forever. In reality, these devices wear out over time and need to be replaced periodically. Another misconception is that all power strips provide surge protection, which is not the case.
It’s also important to understand that surge protectors have limitations. They cannot protect against direct lightning strikes to your home, and they may not be effective against extremely large surges from other sources. Regular maintenance and replacement are necessary for continued protection.
The Limitations of Surge Protectors
While surge protectors are essential for protecting electronics, they are not infallible. No surge protector can guarantee 100% protection against all types of electrical events. Extremely powerful surges, such as those from nearby lightning strikes, can overwhelm even the best protectors.
Additionally, surge protectors have a finite lifespan. Each surge they absorb reduces their capacity to protect against future events. Over time, they may become ineffective without showing any outward signs of failure. This is why devices with indicator lights or automatic shutoff features are invaluable.
Implementing a Comprehensive Surge Protection Strategy
For the best protection, a layered approach to surge protection is recommended. This strategy combines whole-house protection with point-of-use surge protectors for sensitive electronics.
Layered Protection Approach
A comprehensive surge protection plan typically includes these items:
- Whole-house surge protector installed at the main electrical panel
- Dedicated protectors for phone and cable lines
- High-quality surge protectors for valuable electronics and appliances
- UPS systems for critical equipment like computers and servers
This multilayered approach provides redundant protection, significantly reducing the risk of damage from various types of surges.
Proper Grounding and Installation
The effectiveness of any surge protection system relies heavily on proper grounding. Without a good ground connection, diverted electricity may find alternative paths, potentially damaging connected devices. Professional installation by a licensed electrician is crucial to ensure proper grounding and integration with your home’s electrical system.
Cost Considerations for Surge Protection
Investing in surge protection involves upfront costs but can lead to significant savings by preventing damage to expensive electronics and appliances.
Initial Investment
The cost of surge protection varies depending on the level of protection:
- Whole-house surge protectors: Typically cost about $100–$200 per unit, plus installation by an electrician (which can cost an additional $200)
- Quality power strip surge protectors: $20–$70 each
- UPS systems: $100–$350, depending on capacity
Potential Savings from Damage Prevention
The potential savings from preventing surge damage can be substantial, as illustrated by the case of one Acton, Massachusetts home. Electrical contractor Allen Gallant was about halfway through the job of completely rewiring a 3,200-square-foot house when the owners decided to save some money and not install whole-house surge protection against lightning or downed power lines.
Sure enough, as soon after the house was finished, Gallant got a phone call from the distressed owners: Lightning had struck a utility pole near their house, sending a tidal wave of voltage through the wires, past the main breaker panel, and into the house.
“It burned out the motherboard in the subzero refrigerator, fried the temperature controls in the double-wall oven, killed six dimmers, two computers, and every GFCI plug in the house,” Gallant says. “It was an $11,000 loss.”
By comparison, the cost to install a comprehensive surge protection system (typically less than $1,000 total) is relatively modest.
Maintaining and Replacing Surge Protectors
Below, electrician Scott Carson discusses best practices for installing surge protectors.
It’s crucial to maintain your surge protection system to keep it running effectively. This includes the following steps:
- Checking indicator lights on surge protectors regularly
- Replacing plug-in surge protectors every two to three years or after major surge events
- Having whole-house systems inspected by an electrician annually
Remember that surge protectors don’t last forever. Even if they haven’t visibly or audibly responded to a surge, they degrade over time and with use, so replacing them periodically ensures continued protection for your valuable electronics.
Surge Protection for Specific Devices
Different types of devices may require specific surge protection strategies.
Computers and Electronics
For computers, smartphones, and other sensitive electronics, use surge protectors with lower clamping voltages (330V or less) and higher joule ratings. Consider UPS systems for added protection and the ability to safely shut down during power outages.
Home Appliances
Large appliances like refrigerators and washing machines can benefit from dedicated surge protectors designed to handle their higher power requirements. Look for models specifically rated for appliance use.
Entertainment Systems
Home theater systems often include multiple expensive components. Use a surge protector designed for A/V equipment, which may include protection for cable and satellite connections in addition to power outlets.
The Role of Surge Protectors in Home Insurance
While surge protectors can significantly reduce the risk of electrical damage, they don’t eliminate it entirely. It’s important to understand how surge protection relates to your home insurance policy.
Most standard homeowners insurance policies cover damage from lightning strikes and power surges to some extent. However, the coverage may be limited, and repeated claims can lead to increased premiums. Some insurance companies offer discounts for homes with whole-house surge protection, recognizing the reduced risk of electrical damage.
Always review your insurance policy to understand what is and isn’t covered regarding electrical surges and damage to electronics. Consider additional riders or separate policies for high-value electronics if necessary.
Our Conclusion
Surge protectors play a vital role in safeguarding your home’s electrical devices and appliances from potentially costly damage. While no surge protection system is 100% effective against all electrical events, a comprehensive approach combining whole-house and point-of-use protection can significantly reduce your risk.
Investing in quality surge protection is a wise decision for any homeowner. The initial cost is far outweighed by the potential savings from preventing damage to expensive electronics and appliances. Remember to maintain and replace your surge protectors regularly, and consult with a licensed electrician to ensure your home’s electrical system is properly protected. By taking these steps, you can enjoy greater peace of mind knowing your valuable devices are shielded from the unpredictable nature of electrical surges.
Where to Find It
Power strip: Powermax 8 Multi-use AC Surge Protector by Panamax Inc.
Surge station: SurgeArrest Surge Protector Pro8TV by American Power Conversion (APC)
Uninterruptible power supply (UPS): Back-UPS VS 500 by APC
Whole house suppressor: Primax GB13, Panamax, Inc.
Laptop protection: SurgeArrest Notebook Surge Protector PNotePro3 by APC
Computer network protection: ProtectNET Thinnet Port Surge Protector
Telephone, computer, or fax line protection: MAX 2Tel by Panamax
Home entertainment and audio/video system protection: MAX 5100 by Panamax
Source: https://www.thisoldhouse.com/electrical/21194149/how-effective-are-surge-protectors
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