On Sunday, June 11, 2017 at 9:13:55 AM UTC-4, dpb wrote:
On 06/10/2017 9:00 PM, Jon Elson wrote:
rangerssuck wrote:

...

Yup. Screw-terminal sockets for certain common relay sizes definitely do
exist, I have some here for 2 stypes of "ice cube" relays. Not exactly sure
what you are looking for in this piggyback thing, but to just plug an ice
cube relay into a socket and have everything connected by screw terminals,
you should be able to find those.
...

Nope; the "piggyback thing" is precisely that; a pass thru socket that
would provide a second parallel set of contacts independent in
connection point to the originals so he can leave present wiring intact
and add additional for test/upgrade w/o interfering with present
operation. He's already got a screw terminal base...

--

Correct. I do a lot of this kind of work, and these relays are very common in older equipment. Pulling out the relays leaves a very tempting place to interface the new controls without ripping out existing wiring.