[Build] tracing technique

[jim]

   There aren't that many circuits and devices to 
measure, despite the worrisome number of breakers 
throughout. 
   one way to avoid using batteries or tone 
generators is just disconnect one wire from its 
breaker and connect it to the metal box, then use 
an ohm meter to find the grounded hot--follow the 
pipes from the sub-panels. label things, then 
reconnect the wire properly and do it again with 
some other wire. 
   the greatest difficulty, seems to me, will be 
tracing the ceiling fixtures. 

   9 volt batteries, if you go that route, seem 
good to me, as you can get the little caps with 
wires at radio shack stores, use alligator clips 
to connect wires from the batteries to things. 
   (last i looked, a long time ago, OSHA had set 
40 Volts as the threshhold for dangerous.) 



On Thu, 2009-08-27 at 11:49 -0700, Michael Wright wrote:
> Hi Rachel,
> 
> Here's my thoughts on making a battery tracer thingy.
> 
> There's also a bag with a couple of multi-meters and a bunch of test  
> jumpers.
> 
> The simplest parallelizable tracing technique would be to pick up a  
> bunch of 9v batteries, and have each wire tracing person have a  
> voltage to look for
> Circuit 1   9V
> Circuit 2   18V (2 batteries in series)
> Circuit 3   27V (3 batteries in series)
> Circuit 4   36V (4 batteries in series)
> 
> I'd recommend not going over 60V (shock hazard).  One could get fairly  
> complicated with it (led's, etc) but it's probably not worth doing.
> 
> Hook up procedure:
> 
> 1) test circuit is not shorted with ohm meter
> 2) hook up voltage
> 3) find voltage and label circuit.
> 
> The power source would be 4 9v batteries, wired such that there's 1  
> ground (hook to box ground, and 4 outputs (9, 18, 27, 36)
> Parts:
> Radio Shack 9V Battery clips  $3
> 4 9V batteries
> 
> mike
> 
> On Aug 27, 2009, at 11:18 AM, Rachel McConnell wrote:
> 
> > Dr. Jesus wrote:
> >> On Thu, Aug 27, 2009 at 10:49 AM, Ben Kochie<ben at nerp.net> wrote:
> >>> I have a tone and probe set, can bring it.
> >>
> >> There's a tone generator by itself that someone lent me, but it needs
> >> a 9V battery.
> >
> > Is it at 2169 or where?  We can probably locate a battery for it.
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