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#166
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O.T. HD, PSU review:
Bill in Co wrote:
Paul wrote: Bill in Co wrote: Paul wrote: Mark Twain wrote: You have to ask Paul about that stuff. Robert Well, I don't know where your Safety Ground is coming from, on the three prong outlets you do have installed. Two-prong versus three-prong is an odious topic, that's for sure. Paul Just out of curiosity, could someone simply connect the center slot to the large slot (which is normally at ground potential) as a kludge, even though it's a bad idea and obviously against code? I'm thinking that's a bad idea. If there's a fire at your place, and they spot that, it could invalidate your fire insurance. The surge arrestor isn't going to work right either. It might not have the same protection characteristics. And you could have a "shifted neutral" fault. Neutral could be lifted above ground. Since hot and neutral extend outside your house, there are more options for mischief. They don't have to stay at their nominal potentials. A tree could fall and... Paul And just to set the record straight, I hope no one even dares to do this, but I was just curious, and wonder if anyone ever did such a hack. Hopefully not!! Where and how is that neutral normally grounded, anyways? Right outside the house, via some metal rod going into the ground, a few feet down? I'm guessing that's it. To answer your question, yes, it is possible but dangerous. Without testing each wire first there is no way of knowing if parts of system are properly grounded and parts are not. Connecting the outlet white to green or to the outlet metal box could potentially energize the house ground, water pipes, or mobile home framework. I work with this stuff regularly across the usa and Canada. If you open the breaker panel you will find that there may be one or more busbars on the right and left of the breakers or at the bottom of the box. The green is usually on the bottom. Notice that both white and green are fastened to the breaker box metal. The neutral leg of the 240 will also fasten to the metal of the box. There should also be a good sized solid wire from the green going to a metal stake in the ground. The stake depth depends on the average soil resistivity, however 9' (3m) is a good drive depth for 3 ohms or less soil resistivity. On our industrial projects (and my house and garage) we drive several stakes. In addition, the incoming down pole will have its own ground wire with a coil under the pole. A good number for neutral and ground connectionsis less than 1 ohm. The outlets should have less than one ohm between breaker panel ground and the outlet neutral and ground wires. There should be less than 1 ohm between panel ground and neutral wires. Nearly all industrial equipment specifies 2-3 neutrals and 2-4 ground wires. That is to prevent a "shifted neutral" as Paul NoSpam mentioned. Running more than 120 to 240 split phase through the 120 single phase equipment is really destructive. We had an electrician do that once years ago and we lost about $15,000 in a pop and flash. Since then I personally inspect and test the wiring on all of my projects before powering up. |
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#167
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O.T. HD, PSU review:
Just to let you know I changed my nick to
'Robert in CA' (it seemed more appropriate than Mark Twain). Robert |
#168
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O.T. HD, PSU review:
This is just a test to see if it works
(no need to reply) Robert |
#169
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O.T. HD, PSU review:
Mark Twain wrote:
Just to let you know I changed my nick to 'Robert in CA' (it seemed more appropriate than Mark Twain). Robert Or even just Robert. I don't see any other Roberts in here. |
#170
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O.T. HD, PSU review:
Mark Twain wrote:
Just to let you know I changed my nick to 'Robert in CA' (it seemed more appropriate than Mark Twain). Robert How you operate the Google Groups interface on your end, may not change every aspect of how you appear on USENET software clients. In Google Groups, there may be a "show original message" option or equivalent, and that shows the textual content available for USENET users to see. If I use Howard and enter the MID of your current message, I can show you what we see on our side. It looks roughly like this. http://al.howardknight.net/msgid.cgi...egroups.com%3E Paul |
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