On Friday, November 11, 2011 11:58:11 AM andy pugh did opine: > On 11 November 2011 16:22, Brian May <[email protected]> wrote: > > Yes I am a beginner at power electronics. That is why I am asking the > > question. I am reading what I can and asking different people before > > I do anything. I am in no hurry and not planning to wire anything > > until I understand what I am doing > > That would be illegal in the UK.
Depends on which side of the metering you are on here in the states, Andy. Local municipal/state codes _may_ preempt your doing it yourself, but when I installed a 200 amp service, the puny 1974 style service for the house originally installed became a sub-circuit, I found that the load side of the meter didn't need to be inspected before the new drop was hooked up. So the house wiring, while it has had some additions by me (and the central air installer) is relatively untouched, which simplified the breaker lineup in the 200 amp box quite a bit. > Just one of many laws I flout on a regular basis. As have I, but common sense is one I don't flout, at least very often. I can recall that I once had a Phillips double insulated scope hooked across a 10 ohm resistor in the screen circuit of a 4CX5000A in the visual driver side of a GE TF4 transmitter, with a piece of spaghetti over the probe lead as the interlocked door closed on it. That made the scope hot by about 1500 volts so I stood on a plastic stool to operate the scope and take my measurements, which proved that the tube was largely finished, not because of poor cathode emission, but a warped screen grid, it was no longer in the electronic shadow of the control grid and was drawing around 2 amps at sync tip power level while drawing a text book upper end of 18 milliamps as indicated on the screen current meter. I have since learned that you may as well call for a new one if the meter goes above 5 milliamps, the end is nigh on that tube. Sometimes you can tune to increase the loading and keep it running till the new one arrives, mostly you will be down to 75% power in another 2 weeks as that level of peak current draw is pretty self destructive to what is left. Yup, I'm also one of those fools who goes where angels won't. Why, at 77, I am still among us is a puzzle. I don't recommend it for a millisecond. Please, folks, do not use me for an example. :( Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> He who despairs over an event is a coward, but he who holds hopes for the human condition is a fool. -- Albert Camus ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
