A DIY & home improvement forum. DIYbanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » DIYbanter forum » Do - it - Yourself » Home Repair
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems.

3-way switch, always hot



 
 
LinkBack Thread Tools Display Modes
  #1  
Old June 15th 08, 03:14 PM posted to alt.home.repair
external usenet poster
 
Posts: 24
Default 3-way switch, always hot

I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?
Ads
  #2  
Old June 15th 08, 03:23 PM posted to alt.home.repair
external usenet poster
 
Posts: 1,941
Default 3-way switch, always hot


"John Smith" wrote in message
...
I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?




Throw away your meter and hook up a light bulb to the circuit instead. Then
report back here.

  #3  
Old June 15th 08, 03:51 PM posted to alt.home.repair
external usenet poster
 
Posts: 1,565
Default 3-way switch, always hot


"John Grabowski" wrote in message
...

"John Smith" wrote in message
...
I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?




Throw away your meter and hook up a light bulb to the circuit instead.
Then report back here.


I love it!!! One would tend to believe the consummate professional would
advocate only the newest, most technically advanced test equipment is
adequate to properly diagnose these problems... and what does he recommend?
"Scrap the freaking meter, and get a light bulb" Works for me



  #4  
Old June 15th 08, 05:37 PM posted to alt.home.repair
RLM
external usenet poster
 
Posts: 182
Default 3-way switch, always hot

On Sun, 15 Jun 2008 10:14:36 -0400, John Smith wrote:

I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?



http://www.homeimprovementweb.com/in...way-switch.htm

  #5  
Old June 15th 08, 05:39 PM posted to alt.home.repair
RLM
external usenet poster
 
Posts: 182
Default 3-way switch, always hot

On Sun, 15 Jun 2008 10:14:36 -0400, John Smith wrote:

I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?


You might want to bookmark these.

http://www.electrical-online.com/wiringdiagrams.htm
  #6  
Old June 15th 08, 07:02 PM posted to alt.home.repair
external usenet poster
 
Posts: 1,442
Default 3-way switch, always hot

On Jun 15, 2:39*pm, RLM wrote:
On Sun, 15 Jun 2008 10:14:36 -0400, John Smith wrote:
I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).


I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)


This doesn't make sense, does it?


You might want to bookmark these.

http://www.electrical-online.com/wiringdiagrams.htm

.
Agree use a lamp!
He's either picking up induced voltage from adjacent 'live' wires, or
capacitance coupling through switch? Cos even cheap meters are
sufficiently sensitive to do so; OR there is potential coming back on
the 'other' wire from the other 'switch' of the two switches used in
a so called '3 way switch' set up.
PS. Why do we call it '3 way'? Maybe cos of the usually three wires
between the two switches (compared to the usual two for a non-3 way
set up)?
OR ........ ?
Mostly it's a two switch arrangement; typically one switch at top and
another at bottom of stairs! Although there is a special 3rd switch
available (although never seen one) that swaps over the two carriers
of a double pole switch to allow use of witches in three locations.
  #7  
Old June 15th 08, 07:53 PM posted to alt.home.repair
external usenet poster
 
Posts: 1,343
Default 3-way switch, always hot

On Sun, 15 Jun 2008 10:14:36 -0400, John Smith
wrote:

I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).

I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)

This doesn't make sense, does it?


You didn't say if the switches ever worked.

If you just bought a new switch, the chances the new one is bad are
low.

It sounds like the wiring from the other switch may be the one that is
wrong.

If the switches were working properly before you "fixed" them, then
what I would do is take both switches off and locate the hot. (only
one of the 6 should be hot.

I would then put the new switch at that spot and check the other side.

Take your tester to the other point and see if the new switch makes
two of the wires hot by switching back and forth. The wire that
doesn't go hot should be the common.

Reminder: Always turn the power off before making any wiring changes.

A good 3 way will have 0 ohms between the common one traveler in one
position, and infinite ohms between the common to the other traveler.
When you flip the switch you should have the reverse.
  #8  
Old June 15th 08, 08:45 PM posted to alt.home.repair
external usenet poster
 
Posts: 1,565
Default 3-way switch, always hot


"terry" wrote in message
...
On Jun 15, 2:39 pm, RLM wrote:
On Sun, 15 Jun 2008 10:14:36 -0400, John Smith wrote:
I just bought a 3-way switch. I notice that when hot wire is connected
to the black screw, both traveler wires are always hot no matter how I
flip the switch (the hot wire coming out of the other 3-way switch is
always hot, not responding to the position of this switch).


I measured the voltage across the black and either of the two traveler
screws and it was 0. However, if I measure the resistance, it does seem
to work (0 between the black and one of the traveler screws and infinite
if the switch is flipped. Same for both traveler screws.)


This doesn't make sense, does it?


You might want to bookmark these.

http://www.electrical-online.com/wiringdiagrams.htm

..
Agree use a lamp!
He's either picking up induced voltage from adjacent 'live' wires, or
capacitance coupling through switch? Cos even cheap meters are
sufficiently sensitive to do so; OR there is potential coming back on
the 'other' wire from the other 'switch' of the two switches used in
a so called '3 way switch' set up.
PS. Why do we call it '3 way'? Maybe cos of the usually three wires
between the two switches (compared to the usual two for a non-3 way
set up)?
OR ........ ?
Mostly it's a two switch arrangement; typically one switch at top and
another at bottom of stairs! Although there is a special 3rd switch
available (although never seen one) that swaps over the two carriers
of a double pole switch to allow use of witches in three locations.

You never use 3way witches in three locations. You must use at least one
warlock(4way) between the two witches


  #9  
Old June 15th 08, 09:49 PM posted to alt.home.repair
external usenet poster
 
Posts: 13,158
Default 3-way switch, always hot

On Sun, 15 Jun 2008 11:02:18 -0700 (PDT), terry
wrote:

PS. Why do we call it '3 way'? Maybe cos of the usually three wires
between the two switches (compared to the usual two for a non-3 way
set up)?


It's written on the box? :-/
  #10  
Old June 15th 08, 09:54 PM posted to alt.home.repair
external usenet poster
 
Posts: 634
Default 3-way switch, always hot

On 2008-06-15, John Smith wrote:

I measured the voltage across the black and either of the two traveler
screws and it was 0.


This is to be expected, as there should be no voltage drop across a
switch, since there is no load.

However, if I measure the resistance, it does seem to work (0
between the black and one of the traveler screws and infinite if the
switch is flipped. Same for both traveler screws.)


This suggests the switch is fine and you have miswired the circuit.

Cheers, Wayne
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
jumping power from single switch to dual switch (independent) Eholmes124 Home Repair 1 November 27th 06 10:10 PM
Double-pole single toggle switch vs. 3-way switch? East Coast Home Repair 5 June 26th 04 01:05 AM
how to rewire bathroom pull switch to regular light switch Nick UK diy 20 January 20th 04 07:57 PM
Change ceiling outlet pull switch to wall switch? Space Cowboy Home Ownership 12 July 1st 03 02:30 PM


All times are GMT +1. The time now is 12:26 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.SEO by vBSEO ©2010, Crawlability, Inc.
Copyright 2004-2014 DIYbanter.
The comments are property of their posters.