On the printing press I have run for the past few decades, at one      time I had a similar experience. I hadn't figured it out myself and      had a printing electrical technician come out and try to figure it      out. He spent the whole day trying to figure it out. I learned      something from that day. Start looking at the source for brownouts.
      Turned out all the trouble came from a loose wire lug on the main      breaker for that press, it was a rather large breaker, a 3 phase,      240V at 100 amps. I didn't have the courage at the time to attempt      to try to tighten the lugs myself. It took an allen wrench, there      was no way I was putting my hands on a bare allen wrench on a major      circuit like that, even if I knew it wasn't live. But after the lugs      were tightened the brownouts stopped. The technician started at all      the smaller circuits in the press, it wasn't until he worked his way      to the breaker that he found the problem.
      The symptoms were when I turned on a large pump that had a draw of      around 50 amps various parts of the press would shut down. It didn't      do it all the time. Problems like that can be mystifying if you      haven't ever seen them before.
      Just sharing my experience.
      Steve
      
      
On 11/28/2012 10:44 PM, subprong wrote:
      
                                                 Various lights (on different breakers) are flickering.                 This happens randomly when nothing major is in use nor is                anything major kicking on (like an AC or fridge) and I've                also noticed happens sometimes if I use something (for                instance a tool I used this evening initially sounded                quite drained and sputtery as the lights flickered).  I                believe it's also happening on an entire different line                for someone else but not positive.  The flickering is                usually pretty speedy, flicking a couple/few times rather                fast....not sure if it's my imagination but it does vary                from being dim to brighter at points.  
                
              
              On Wed, Nov 28, 2012 at 7:40 AM,                wired 
<wiredformen@yahoo.com>                wrote:                
                                                                                                                                   When this happens do you notice some get                            brighter while others get dimmer? That would                            be a neutral connection issue either on the                            street or within your service panel/meter. Are                            they on different circuits (breakers)? I                            assumed you mean more than one fixture                            flickering.
                            If only 1 circuit flickers, it's in that                            circuit. Likely the wiring goes from plug to                            plug/switch and could be a loose connection at                            any of the plugs on the circuit.
                                                                                                                  --- In 
DoIt_Yourself@yahoogroups.com,                              subprong 
<subprong@...> wrote:
                              >
                              > I've noticed flickering lights indoors                              the last couple of days that are
                              > fairly frequent. Electrically speaking                              nothing has changed recently. The
                              > only thing of minor note would be that                              I changed out an outdoor security
                              > light bulb a week or so ago on a dusk                              til dawn sensored light. Is there a
                              > chance that this bulb is working                              properly (lit) but be somehow defective
                              > that it would trigger problems on other                              circuits (pulling current from
                              > other circuits)?
                              > 
                              > This light flickering happened a few                              years ago. The electric company came
                              > out and did something at the pole which                              fixed things up at the time. After
                              > he left I found a 3" long section of                              tightly bundled wires that had been
                              > cut and I presume replaced or adapted.                              It was a bunch of colored wires
                              > within a black casing. Probably about                              3/4"-1" in diameter.
                              > 
                              > Basically trying to figure out if this                              is something on my end or their end
                              > again.
                              >                                                          
                                                                                                                                    
                                                 
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