Confirmed this morning... the product listed below functions fine without a grounded outlet. It also has built in filter.
http://www.pricewheeler.com/prod8r.htm
http://www.pricewheeler.com/prod8r.htm
I want surge protection, but I have no grounds
Hello all, this is my first post.
I am seeking advice on how I should handle a problem with my apartment. I recently upgraded my CD player and have suddenly become concerned about surge protection. Unfortunately, I can't use a surge protector effectively because I have no grounds in my apartment - only 2-prongers.
I read that I could use the grounded adapter plugs to solve this problem. After installing one, my multimeter reads 123V between the hot and neutral, and only 35V between the hot and ground... I believe this means the boxes and conduit are not metal and cannot serve as a ground. I tried again on 3 other outlets with the same results on every attempt.
At this point, the only options I can think of are:
1) Don't worry about it. Surge protection is overrated? One thing I can say is that about a year ago lightning struck a transformer outside the apartments and blew the video card and modem on my computer (no stereo damage fortunately).
2) Rig something up. I heard this was not very smart, but I could run a wire from the ground on the adapter to the drain on my kitchen sink. Hopefully that would give me a solid ground connection, and wouldn't electrocute me in the shower one day.
3) Buy a ground electrode and put it outside my window. Unfortunately, I don't even know what these look like, how much they cost, how hard they are to install, or if the owner would freak out if they found it (I live on second floor).
4) Suggestions? Is there a product or option I haven't heard about? My budget is limited... but spending a little now is better than replacing my entire system later.
Thanks for any help offered,
Will
I am seeking advice on how I should handle a problem with my apartment. I recently upgraded my CD player and have suddenly become concerned about surge protection. Unfortunately, I can't use a surge protector effectively because I have no grounds in my apartment - only 2-prongers.
I read that I could use the grounded adapter plugs to solve this problem. After installing one, my multimeter reads 123V between the hot and neutral, and only 35V between the hot and ground... I believe this means the boxes and conduit are not metal and cannot serve as a ground. I tried again on 3 other outlets with the same results on every attempt.
At this point, the only options I can think of are:
1) Don't worry about it. Surge protection is overrated? One thing I can say is that about a year ago lightning struck a transformer outside the apartments and blew the video card and modem on my computer (no stereo damage fortunately).
2) Rig something up. I heard this was not very smart, but I could run a wire from the ground on the adapter to the drain on my kitchen sink. Hopefully that would give me a solid ground connection, and wouldn't electrocute me in the shower one day.
3) Buy a ground electrode and put it outside my window. Unfortunately, I don't even know what these look like, how much they cost, how hard they are to install, or if the owner would freak out if they found it (I live on second floor).
4) Suggestions? Is there a product or option I haven't heard about? My budget is limited... but spending a little now is better than replacing my entire system later.
Thanks for any help offered,
Will
Showing 4 responses by wtwood
I tried it several ways. With the screw out, directly to the adapter's exposed metal ground connector, and to the adapter's 3rd prong. I really can't explain why I got 35V instead of 0, but after taking the cover plate off the outlet, it looks like a grey plastic box. I wired up the ground to the kitchen plumbing drain temporarily yesterday just to see what happened, and I got a 120V reading. |
Well, after spending my entire weekend doing online research and rigging a ground wire to my plumbing, I think I may have come across a real solution to my problem. This company called "Brickwall" manufactures surge protection that does not divert power to the ground wire... unlike what appears to be 99.99% of other manufacturers. http://brickwall.com/grndcur.htm#form According to their website, "Almost all manufacturers of shunt mode surge protectors (those utilizing MOVs) design their products to divert surge current equally between the ground and neutral wires. A surge protector should not divert surge current to the ground wire.... ...Brick Wall surge protector products are based on the current (hence voltage) limiting of a massive inductor. Residual energy that leaks through is captured by a series of electrolytic capacitors. There it is slowly leaked back to the neutral at a harmless level. Outside of trivial amounts of parasitic capacitance our Series Mode surge protectors do not put any surge current on the ground of your systems." I get the gist of what they are saying, but since I'm not an EE I think I will call the and check out the details. Hopefully, this will solve my problem and also offer a good unit to use in the future even if I move into a place that has decent wiring. |
I didn't realize that surges could be through the neutral, and I now see that it does not protect against them. Unfortunate. Do these occur with the same severity and frequency as hot line surges? Regarding the supply impedance issue: I live in an apartment and rarely play the system at high levels. My receiver is rated 35Wx2. Does my modestly powered system make this less of a problem than if I had a big 5 channel system for instance? Does current have any relationship with impedance in this situation? Intuitively, I don't see why it would, but I don't really understand how the unit functions and if it behaves differently at different currents. |