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What isthe proper amount of joules you would needs in a surge protected powerbar for my laptop, modem and a floorlamp?

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  • ritar2006 Jul 28, 2008

    Thanks guys or gals , very helpful to a non techo, who is learning

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The more the better. This rating determines how much of a surge the bar can surpress, not the load you are putting on it.

Here is a very good article, a bit long, but there is a paragraph about this rating.

http://www.avdeals.com/classroom/powerprotectionarticle.htm

Generally, floor lamps do not need surge protection, unless they have some kind of fancy electronic control.

Posted on Jul 26, 2008

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Posted on Jan 02, 2017

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Surges give me more than half of my repair jobs,so [1] it is best to simply unplug ALL of your best devices when you expect to be away for awhile, and [2] your purchase of a surge limiter will cost you less than $30 on the net, or less than $40 at Walmart or Lowes, or Home Depot, and be sure to buy a 6' length of coaxial cable at the same time unless you have one hanging around. [They are right now probably in a closet among a whole bunch of stuff that's just barely too valuable to throw away -- stuff that your sweetie has threatened to chuck any minute now.]

Your surge limiter must be rated at 3000 joules or more, and must have at least two shiny threaded 3/8th inch projections on it to accommodate coaxial cables. The limiters are easy to hook up, but you can email to me for freebie coaching if you need to. I am at GrampsCanHelp@gmail.com

Lightning will jump limiters sometimes, and they get tired after 3 or 4 years so must be replaced, but thereafter they remain valuable as power strips. They are far far from being perfectly protective because fragments of lightning strikes jump them and damage them, but they are the best devices that low cost technology has been able to bring to us to date.

[A 'back-up' power supply containing a battery and isolation transformer will be more protective but costs 3 to 6 times as much. You may wish to get more details about them from me, but they should only be considered for VERY expensive or very precious devices.]

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Here is a few tips to look for in a good surge protector:

1. Response time should be less than 1 nanosecond.

2. Energy absorption/dissipation should be at a rating of 600 joules or more.

3. Clamping voltage should be 330 V to 400 V. Generally, a clamping voltage more than 400 V is too high.

4. Get one with a an indicator light that tells you if the protection components are functioning. All MOVs (Metal oxide varistors (MOV) are semiconductors that protect electronic components and systems from transient voltages) will burn out after repeated power surges, but the protector will still function as a power strip. Without an indicator light, you have no way of knowing if your protector is still functioning properly.

5. Get one that has self test function. A button you push to test it.

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Hello illeanaceres,

I'm sorry to hear about the bad news, I had something similar happen to me around a month ago.

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Surge protectors only protect equipment up to a certain amount of joules. Basically if the lightning is powerful enough it can damage electronics with that initial surge. You should replace your surge protectors every few years if it is 2-3 years old then it may not be as effective.

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First thing I'd check is the powerbar. Did you plug the TV into the outlet direct? What caused the breaker to trip? If it was an overload by using too much current, there is a possibility that there is a loose connection in your house wiring causing arcing and the interiference lines you're seeing on the display. You may even want to try the set in a different outlet if the powerbar checks ok, and if the set then works fine, get an electrican ASAP!

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