Relay Out

This is the wiring that is needed. (Please ETC, include this in the manual)

Relay Out (remote trigger connector) - Online Eos Manual

Yes, I know this diagram, but it is missing the wiring for the Relay Out.

I'd suggest that's because in most cases you wouldn't be just wiring it to a 12V bulb but doing something more useful with it,  eg triggering some external thing.

Agreed, the bulb was just an example for any power consumer though.

I suppose I was trying to say that in most cases you wouldn't want to be using the 12V out into the relay,  as the relay would be closing the circuit of something else that was supplying it.  The idea of the relay is really to provide isolation between the desk and the other circuit. 

As it happens if you were actually trying to connect it up to something that needed a 12V input signal,  you'd need to connect 14 to 11 not 12 to 11 as you are currently disconnecting ground rather than power when the relay switches. Whilst it works in the simple case of a lamp is not likely to be what you want driving another circuit  (unless it had opto isolation on its input).   (Its a similar case to people wiring switches in the netural rather than live on power - works but not what you would generally want to do)

I suppose I was trying to say that in most cases you wouldn't want to be using the 12V out into the relay,  as the relay would be closing the circuit of something else that was supplying it.  The idea of the relay is really to provide isolation between the desk and the other circuit. 

As it happens if you were actually trying to connect it up to something that needed a 12V input signal,  you'd need to connect 14 to 11 not 12 to 11 as you are currently disconnecting ground rather than power when the relay switches. Whilst it works in the simple case of a lamp is not likely to be what you want driving another circuit  (unless it had opto isolation on its input).   (Its a similar case to people wiring switches in the netural rather than live on power - works but not what you would generally want to do)

Gotcha, thanks for the clarification!