In some countries, connecting the neutral to an outside earth could be extremely dangerous, leading to fires or even electrocution. Where a Protective Multiple Earth system is used, a ruptured neutra
Jim, As succinct and apposite response I could imagine. Much as I respect Manfred, I think he is "pushing things" a bit far - at least for "Joe Q. Ham". 73 Peter G3RZP _______________________________
'at 1.5kW, the RF part can be non-trivial' I think that's a classic understatement! Even without the 2kV insulation requirement, I don't think the RF parts are non-trivial at that power level. 73 Pet
Manfred, I am afraid you are missing my point. What you can do safely as a professional engineer is not the same as the average amateur building at home. For example, getting the necessary spacing be
I wonder what bright spark came up with the concept of a 15 digit part number? Doesn't seem a snappy way to refer to a device..... 73 Peter G3RZP _______________________________________________ Amps
will cause a train wreck?< If you ground the neutral to an external ground and get a ruptured neutral on your feed, who knows? We nearly had a small shopping mall catch fire when the 3 phase feed lo
It depends how the earthing is done. The neutral is earthed at the transformer and several places along its route. If you earth the neutral when it enters the property, a ruptured neutral then means
Bill, We start off with a 3 phase star (wye) connected supply at nominally 415 volts per phase. Each house gets one phase and the neutral i.e. 240 volts give or take. The neutral is grounded (earthed
Bill, The supply is a neutral (which is theoretically at ground potential and actually may be so, or very close to it) and a single phase 240volt line - in my case 234, as it happens. The neutral is
many places AFCI.< How do they perform with RF around? I have a 100mA RCD that trips if I use the dipole and 400 watts on 80m, and I had one breaker that with just a 1 foot length of wire connected
Manfred, There are so many 'standards' around the world there almost aren't any! Here I have 100 Amp 240 v single phase to the house, and the neutral is grounded by the supply company on the pole in
It needs the appropriate PF correction circuitry, too. 73 Peter G3RZP == Message Received: Sep 22 2013, 05:10 AM From: "Don Jones" <ko7i@comcast.net> To: amps@contesting.com Cc: Subject: Re: [Amps] D
Jim, What about power factor correction circuitry? 73 Peter G3RZP == Message Received: Sep 22 2013, 06:27 PM From: "Jim Thomson" <jim.thom@telus.net> To: amps@contesting.com Cc: Subject: [Amps] Dire
Jim, Do you happen to know under which EU Directive these codes are? it would cost me $200 to buy what might be the relevant standards.....if they are under the EMC Directive, they don't apply to hom
Dear Manfred, You must differentiate between what a technically competent ham (you) can legally do at home, and what may be done in a commercial equipment. Plus what is measured on what is effectivel
Bill, As I understand it - and quite likely I' m wrong - with a normal rectifier and input C, the rectifiers draw current only when the transformer volts exceed the reservoir capacitor volts. This pu
Manfred, In the EU, the harmonics impressed on the mains and the PF are governed by the EMC Directive. Now the Directive has an exclusion clause for radio amateur's home made equipment and for amateu
Jim Exception is if you want to go into manufacturing equipment, and then requirements can exist e.g. in EU. 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@cont
Because of the relatively high plate impedance of a tetrode or pentode, modulating plate voltage without modulating screen voltage has a relatively small effect. Which is why plate and screen modulat