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Double-pole single toggle switch vs. 3-way switch?



 
 
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  #1  
Old June 24th 04, 08:28 AM
East Coast
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Default Double-pole single toggle switch vs. 3-way switch?

I have looked in a couple of wiring books and I don't see double-pole
single toggle switches addressed. What is the difference between a
Double-pole single toggle switch and a 3-way switch? I see in the
Leviton catalog these are two different items.

If you have a single light, like in a hallway, and want to be able to
switch it on and off from two different locations, you use a 3-way
switch I've been told. How is a double-pole single toggle switch used?
Thanks!
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  #2  
Old June 24th 04, 08:42 AM
[email protected]
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Default Double-pole single toggle switch vs. 3-way switch?

In alt.engineering.electrical East Coast wrote:
| I have looked in a couple of wiring books and I don't see double-pole
| single toggle switches addressed. What is the difference between a
| Double-pole single toggle switch and a 3-way switch? I see in the
| Leviton catalog these are two different items.

A 3-way is a single pole double throw. It switches one common terminal
between 2 other terminals.

A double pole is like 2 switches latched together, but with separate
wiring circuits. A single throw would just be an on-off for a 2-pole
circuit, such as 240 volts in the US.


| If you have a single light, like in a hallway, and want to be able to
| switch it on and off from two different locations, you use a 3-way
| switch I've been told. How is a double-pole single toggle switch used?

It doesn't have much common use in a home. It could be used to turn
on and off smaller 240 volt loads.

--
-----------------------------------------------------------------------------
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
-----------------------------------------------------------------------------
  #3  
Old June 24th 04, 01:57 PM
John Gilmer
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Default Double-pole single toggle switch vs. 3-way switch?


"East Coast" wrote in message
om...
I have looked in a couple of wiring books and I don't see double-pole
single toggle switches addressed. What is the difference between a
Double-pole single toggle switch and a 3-way switch?


A Three-Way switch is identical to a SPDT switch in every respect. If they
are listed separately it might be because one is generally intended for a
particular application.

The three say switches are routinely used in homes to permit, for example, a
hall lighting fixture to be controlled from both the top and the bottom of
the stairway. Any "home center" type store will carry this type of switch.

Double pole (DPST) switches are ofen used to switch 240 volt loads (I use
one at my water heater as a "vacation" switch.) These switches are also
carried by Lowe's and Home Depot type stores.

There is another switch call the Four Way switch. Internally, it is a DPDT
switch which is internally connected as a 2 pole reversing switch. The
4-way switch is used in combination with 2 three way switches (above) to
switch a light fixture from 3 separate locations. Actually, you can add
as many 4-way switches as you care and any switch will turn the light on or
off. These switches (4-way) are a little harder to find but they are out
there.

A true DPDT switch with reasonable ratings (240 volts, 20 amps) is hard to
find. They have an obvious application is switching a load between two
power sources. When sold as "transfer switches" they are quite expensive.
Some power panel makers use mechanical interlocks to cause two circuit
breakes to act as a transfer switch.

I see in the
Leviton catalog these are two different items.

If you have a single light, like in a hallway, and want to be able to
switch it on and off from two different locations, you use a 3-way
switch I've been told. How is a double-pole single toggle switch used?
Thanks!


The 4-way (reversing switch) is placed BETWEEN the two 3-way switches.
Operation of the 4-way has the same effect as operating one of the 3-ways.
As mentioned above, you can put in a many 4-ways as you care.


  #4  
Old June 24th 04, 09:11 PM
Louis Bybee
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Default Double-pole single toggle switch vs. 3-way switch?

wrote in message
...
In alt.engineering.electrical East Coast

wrote:
| I have looked in a couple of wiring books and I don't see double-pole
| single toggle switches addressed. What is the difference between a
| Double-pole single toggle switch and a 3-way switch? I see in the
| Leviton catalog these are two different items.

A 3-way is a single pole double throw. It switches one common terminal
between 2 other terminals.

A double pole is like 2 switches latched together, but with separate
wiring circuits. A single throw would just be an on-off for a 2-pole
circuit, such as 240 volts in the US.


| If you have a single light, like in a hallway, and want to be able to
| switch it on and off from two different locations, you use a 3-way
| switch I've been told. How is a double-pole single toggle switch used?

It doesn't have much common use in a home. It could be used to turn
on and off smaller 240 volt loads.

--
--------------------------------------------------------------------------

---
| Phil Howard KA9WGN |


A two pole switch is also frequently used to switch multiple loads supplied
from different circuits. An example would be a light and fan in a bathroom,
fed from different circuits, but designed to be switched on and off
simultaneously.

Louis--
*********************************************
Remove the two fish in address to respond


  #5  
Old June 25th 04, 11:30 PM
No Spam
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Posts: n/a
Default Double-pole single toggle switch vs. 3-way switch?

John Gilmer wrote:
"East Coast" wrote in message
om...

I have looked in a couple of wiring books and I don't see double-pole
single toggle switches addressed. What is the difference between a
Double-pole single toggle switch and a 3-way switch?



A Three-Way switch is identical to a SPDT switch in every respect. If they


A SPDT switch can come in On-Off-On or On-On
configurations. Any 3-ways I've ever seen have been On-On only.
Other than that, excellent answer.

are listed separately it might be because one is generally intended for a
particular application.

The three say switches are routinely used in homes to permit, for example, a
hall lighting fixture to be controlled from both the top and the bottom of
the stairway. Any "home center" type store will carry this type of switch.

Double pole (DPST) switches are ofen used to switch 240 volt loads (I use
one at my water heater as a "vacation" switch.) These switches are also
carried by Lowe's and Home Depot type stores.

There is another switch call the Four Way switch. Internally, it is a DPDT
switch which is internally connected as a 2 pole reversing switch. The
4-way switch is used in combination with 2 three way switches (above) to
switch a light fixture from 3 separate locations. Actually, you can add
as many 4-way switches as you care and any switch will turn the light on or
off. These switches (4-way) are a little harder to find but they are out
there.

A true DPDT switch with reasonable ratings (240 volts, 20 amps) is hard to
find. They have an obvious application is switching a load between two
power sources. When sold as "transfer switches" they are quite expensive.
Some power panel makers use mechanical interlocks to cause two circuit
breakes to act as a transfer switch.

I see in the

Leviton catalog these are two different items.

If you have a single light, like in a hallway, and want to be able to
switch it on and off from two different locations, you use a 3-way
switch I've been told. How is a double-pole single toggle switch used?
Thanks!



The 4-way (reversing switch) is placed BETWEEN the two 3-way switches.
Operation of the 4-way has the same effect as operating one of the 3-ways.
As mentioned above, you can put in a many 4-ways as you care.



  #6  
Old June 26th 04, 01:05 AM
[email protected]
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Posts: n/a
Default Double-pole single toggle switch vs. 3-way switch?

In alt.engineering.electrical No Spam wrote:
| John Gilmer wrote:
| "East Coast" wrote in message
| om...
|
|I have looked in a couple of wiring books and I don't see double-pole
|single toggle switches addressed. What is the difference between a
|Double-pole single toggle switch and a 3-way switch?
|
|
| A Three-Way switch is identical to a SPDT switch in every respect. If they
|
| A SPDT switch can come in On-Off-On or On-On
| configurations. Any 3-ways I've ever seen have been On-On only.
| Other than that, excellent answer.

And some come in momentary contact while others are not.

--
-----------------------------------------------------------------------------
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
-----------------------------------------------------------------------------
 




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