Forum: NEC
06-21-2008, 01:11 PM
|
|
Replies: 49
Views: 1,543
It sounded to me like the original poster was...
It sounded to me like the original poster was under the impression that shunting some of a ground fault current to the bonded water pipe would rob the breaker of some of its needed fault current. But...
|
|
Forum: Power Quality & Surge Protection
12-29-2007, 05:04 PM
|
|
Replies: 18
Views: 876
Dennis, whenever you give a mG measurement you...
Dennis, whenever you give a mG measurement you must state the distance from the source, unless it is a general condition from a distant source.
Rule of thumb when you put your gaussmeter sensor...
|
|
Forum: Power Quality & Surge Protection
12-29-2007, 02:06 PM
|
|
Replies: 18
Views: 876
|
|
Forum: Grounding versus Bonding
09-10-2007, 08:31 PM
|
|
Replies: 110
Views: 6,668
Robert,
If you are interested in what actually...
Robert,
If you are interested in what actually happens (from many investigations), because the impedances of the several service neutrals are not the same, the amperages on the different water...
|
|
Forum: Grounding versus Bonding
09-04-2007, 02:17 PM
|
|
Replies: 110
Views: 6,668
Bob,
If you find a definition of...
Bob,
If you find a definition of "objectionable" let me know.
You say that since currents on water pipes exist by the thousands (millions?) that it isn't likely that it has suddenly become...
|
|
Forum: Grounding versus Bonding
09-04-2007, 02:09 PM
|
|
Replies: 110
Views: 6,668
M.D.
That is an excellent article by a well...
M.D.
That is an excellent article by a well respected engineer. It is good to see an electrical condition researched in a thoroughly scientific manner. I recommend this article to all electricians...
|
|
Forum: Grounding versus Bonding
09-03-2007, 09:53 PM
|
|
Replies: 110
Views: 6,668
|
|
Forum: Grounding versus Bonding
09-03-2007, 09:50 PM
|
|
Replies: 110
Views: 6,668
Bob, how about this. You walk on the job. The...
Bob, how about this. You walk on the job. The electrode is there. You connect it. You then measure objectionable current. You remove the connection and supplement with another electrode.
Karl
...
|
|
Forum: Grounding versus Bonding
09-03-2007, 06:43 PM
|
|
Replies: 110
Views: 6,668
I agree with Megawatt.
Brian, if a house looses...
I agree with Megawatt.
Brian, if a house looses a neutral usually some light bulbs blow out and a vacuum cleaner does not work or overheats, but usually the house does not burn down and nobody dies....
|
|
Forum: Power Quality & Surge Protection
09-01-2007, 12:56 PM
|
|
Replies: 30
Views: 1,949
Since milligauss applies to both AC and DC...
Since milligauss applies to both AC and DC magnetic fields, with very divergent health consequences, one needs to specify AC or DC. Also, what frequencies, and what kind of wave forms?
Karl
|
|
Forum: Power Quality & Surge Protection
08-31-2007, 10:34 PM
|
|
Replies: 46
Views: 8,529
|
|
Forum: Power Quality & Surge Protection
08-31-2007, 10:33 PM
|
|
Replies: 46
Views: 8,529
|
|
Forum: Power Quality & Surge Protection
08-30-2007, 05:49 PM
|
|
Replies: 46
Views: 8,529
|
|
Forum: Power Quality & Surge Protection
08-30-2007, 05:41 PM
|
|
Replies: 30
Views: 1,949
|
|
Forum: Power Quality & Surge Protection
08-29-2007, 08:31 PM
|
|
Replies: 46
Views: 8,529
|
|
Forum: Power Quality & Surge Protection
08-28-2007, 10:40 PM
|
|
Replies: 30
Views: 1,949
After my last post I received an email...
After my last post I received an email referencing a new report which contains all the unbiased info one could want about the health effects of power frequency magnetic fields. I have met many of...
|
|
Forum: Power Quality & Surge Protection
08-28-2007, 10:36 PM
|
|
Replies: 46
Views: 8,529
I just received an email reference to an EMF...
I just received an email reference to an EMF report that reviews the main health effects by a group of scientists who have done research in the field. It is not biased by the usual governmental or...
|
|
Forum: Power Quality & Surge Protection
08-28-2007, 06:33 PM
|
|
Replies: 30
Views: 1,949
My reaction to all the posts was I admit too...
My reaction to all the posts was I admit too short tempered. At my age (79) that happens.
But as to whether my opinion is extreme, I should mention that I was in on the 5-day research conferences...
|
|
Forum: Power Quality & Surge Protection
08-28-2007, 06:09 PM
|
|
Replies: 46
Views: 8,529
|
|
Forum: Power Quality & Surge Protection
08-27-2007, 10:08 PM
|
|
Replies: 46
Views: 8,529
Sorry I didn't check the posts earlier. I have...
Sorry I didn't check the posts earlier. I have been doing a lot of traveling this summer.
To answer the original question (if the questioner is still around), 300 feet is well beyond the range of...
|
|
Forum: Power Quality & Surge Protection
08-27-2007, 09:51 PM
|
|
Replies: 7
Views: 684
|
|
Forum: Power Quality & Surge Protection
08-27-2007, 09:45 PM
|
|
Replies: 7
Views: 684
3 meters will reduce the magnetic field from...
3 meters will reduce the magnetic field from transformers to below 1 milligauss (mG) and thus be out of the range of the reported health effects, particularly for children. It is also below the level...
|
|
Forum: Power Quality & Surge Protection
08-27-2007, 09:38 PM
|
|
Replies: 30
Views: 1,949
Wow! I just read these posts. The level of...
Wow! I just read these posts. The level of humorous ignorance shown re: magnetic fields and health effects is surprising at this time (2007) since so much valid scientific research has been published...
|
|
Forum: Grounding versus Bonding
07-02-2007, 08:07 PM
|
|
Replies: 26
Views: 1,168
Quogueelectric,
The distortion in the monitor...
Quogueelectric,
The distortion in the monitor you mentioned would have been due to the magnetic field from the service cable as you suspected. However, a faraday cage would have had no effect on the...
|
|
Forum: Electrical Calculations/Engineering
06-28-2007, 10:49 AM
|
|
Replies: 109
Views: 4,463
|
