Adding another switch to a relay operated light switch

Posted by John Smith on September 13, 2008, 8:27 am

Light switch in my room is operated using a relay (rated 24v-8v). It just like in
the picture http://home.howstuffworks.com/relay1.htm
The top "battery" is ofcourse regular power. The bottom "battery" is operated by
24V transformer.

I'd like to add another switch to the relay. How do I do add it to this system?
I have another 24V transformer with a switch. If we have the
http://home.howstuffworks.com/relay1.htm system as an example - could I add
another switch+battery to the same coil? Actually the relay is a latching relay.

Posted by Speedy Jim on September 13, 2008, 9:23 am

John Smith wrote:

> Light switch in my room is operated using a relay (rated 24v-8v). It just like

> the picture http://home.howstuffworks.com/relay1.htm
> The top "battery" is ofcourse regular power. The bottom "battery" is operated

> 24V transformer.
>
> I'd like to add another switch to the relay. How do I do add it to this

system?

> I have another 24V transformer with a switch. If we have the
> http://home.howstuffworks.com/relay1.htm system as an example - could I add
> another switch+battery to the same coil? Actually the relay is a latching

relay.

Sounds like the GE remote control system.
Is this the relay you have:

http://www.lightcontrol.net/a3RR9.htm

Posted by John Smith on September 13, 2008, 10:06 am

>John Smith wrote:

>> Light switch in my room is operated using a relay (rated 24v-8v). It just

like in

>> the picture http://home.howstuffworks.com/relay1.htm
>> The top "battery" is ofcourse regular power. The bottom "battery" is operated

>> 24V transformer.
>>
>> I'd like to add another switch to the relay. How do I do add it to this

system?

>> I have another 24V transformer with a switch. If we have the
>> http://home.howstuffworks.com/relay1.htm system as an example - could I add
>> another switch+battery to the same coil? Actually the relay is a latching

relay.

>Sounds like the GE remote control system.
>Is this the relay you have:
>http://www.lightcontrol.net/a3RR9.htm

Does not look like that at all. But that is not the point here.

Electrically speaking a similar situation would be if I have two transformers and
connection the their hot wires and also their "cold" wires. The relay is allready
connected to a transformer. Can I connect another transform there also? What
would happen? It's not a short at least.

I've included a small picture to illustrate what I mean.

Posted by RBM on September 13, 2008, 11:25 am

Your picture shows the two switches in series with each other. That won't
work. You have to install the second switch in parallel with the first one,
this way either switch will ratchet the relay one notch each time it's
closed

Posted by John Smith on September 13, 2008, 12:53 pm

>Your picture shows the two switches in series with each other. That won't
>work. You have to install the second switch in parallel with the first one,
>this way either switch will ratchet the relay one notch each time it's
>closed

Correct again.
Looks like I have to do that. After following a lot of wires I still can't locate
the original transformer.

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