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Posted by farseer on November 26, 2006, 8:13 am
Since 120 is leaving the second switch, it has to be arriving at that
switch (assuming it's from the travellers from the first switch). I
went a head and verified that it is indeed arriving from the
travellers. i was able to do this by toggling the first switch on and
off. when i did this, power alternated between one of those two
travellers, connected to the second switch, which it should.
this then leaves the connection from second switch to the fixtures.
there are three fixtures in series. i don't know which is first. is
it possible that wone of those has a loose connection that was jarred
apart by when the circuit tripped? So you are thinking this is likely
a fixture issure and not the wire itself, correct?
I will try testing the bulb itself like you said. From what i
understand, you are saying i can connect a bulb DIRECTLY to a 120v feed
wire?
thanks fo ryou help.
> farseer wrote:
> > Hi,
>
> Item, (1)
> > Is there a way to send a signal of any kind from the switch node to
> > the fixture and test if it gets there?Suggestion; You clearly understand the
idea of the first switch
> 'sending' the voltage to the second switch. Suggest that as a next step
> you make sure it is 'arriving' at the second switch.
> Depending in which position is the first switch the voltage will be on
> one or the other wires to the second switch. OK so far?
>
> Then depending on the position of the second switch the voltage will or
> will not be sent to the light fixture/s. Once you know it's arrived at
> the second switch you can figure why/how it's getting, or not getting
> to the fixture. Yes there is a way; just rig up a temporary connection
> to some source of AC voltage from either a live wire within that switch
> box or from an extension cord. that should 'prove' the wiring to light
> fixture.
>
> Item (2)>Also, what is the proper way measure the voltage of light fixture.
> > this light fixture has a bx cable with white and black wire. The way i
> > have been testing using my multitester is touching the red probe to
> > the black wire, and using the fixture itself as the ground. Is that
> > correct?Suggestion: Good enough, assuming all grounds are OK. You are only
> looking for voltage. But many test meters are far too sensitive and can
> sometimes give false/misleading readings.
> Its often better to use a bulb, either in a holder with a couple of
> short leads or even just touching one side of the bulb base to ground
> or neutral and the other to the wire you are testing to see if it is
> alive.
> I used a bulb that way tonight to make sure voltage was arriving a new
> switch for some workshop ceiling lights (just touched the base of the
> bulb temporarily borrowed from nearby cos i was too lazy to go upstairs
> and get a spare), to the wires. It was; the bulb lit. Clearing up later
> couldn't figure why the stair light didn't work. I had borrowed that
> bulb for testing cos it was easy to reach!
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