Electrical β FAQ
What joule rating should I look for in a surge protector?
For basic electronics like lamps and phone chargers, 1000 joules suffices. Computers and home theater equipment need 2000-3000 joules. For maximum protection and longevity, choose 4000+ joules like our top pick. Higher ratings mean the protector can absorb more surges before failing.
Can I use a surge protector for my refrigerator?
Yes, but choose a model designed for appliances with voltage protection, not just surge suppression. Refrigerators need protection against brownouts and over-voltage conditions that damage compressors. The appliance-specific models we tested include this critical feature.
What's the difference between UL and ETL certification?
Both indicate the product meets rigorous safety standards. UL (Underwriters Laboratories) is more widely recognized, while ETL (originally Edison Testing Laboratories) uses the same standards. Both require regular factory inspections. Either certification ensures safe operation.
How long do surge protectors last?
Most last 3-5 years under normal conditions, but heavy surge activity degrades them faster. Many include indicator lights that dim when protection is exhausted. Replace after major electrical storms or if the indicator changes. Higher joule ratings extend lifespan.
Do USB ports affect the surge protection of AC outlets?
No, quality surge protectors isolate USB circuits from AC outlets. However, cheap models may share components, reducing overall protection. Our tested units maintain full surge protection on AC outlets regardless of USB usage. Look for UL certification to ensure proper isolation.
Can I daisy-chain surge protectors together?
Never daisy-chain surge protectors. This violates electrical codes, creates fire hazards, and voids warranties. It can also cause ground loop issues that reduce protection effectiveness. Instead, buy one strip with sufficient outlets for your needs, like the 13-outlet TROND.
