Which transformer for Ring Video Doorbell Wired (UK)?

[winston1]

So it appears that some bell transformers are a poor crappy design and cannot take full load continuously after all. Apologies to BG for saying it was a myth.
However I wonder if this only applies to the small ones squeezed into a CU. The large Friedland types certainly look big enough to run 20VA continuously.

 

[bernardgreen]

They are not poor crappy designs, just the opposite in fact. They are designed to perform a particular task and to do that task safely and reliably.

If there is any crap it is the lack of knowledge and the subsequent misuse of items ( such as bell transformers ) for a task they are not designed for.

 

[SUNRAY]

So it appears that some bell transformers are a poor crappy design and cannot take full load continuously after all. Apologies to BG for saying it was a myth.
However I wonder if this only applies to the small ones squeezed into a CU. The large Friedland types certainly look big enough to run 20VA continuously.

Errr no...

I fell into this trap in 2019, I needed to install a 10W led flood lamp for several days at an event, the CU was in the old pantry, now used as a cupboard for brooms, Henry, etc. My intention was to add another circuit in the CU for a 12V transformer. After mounting the light and passing a cable through the air brick I found the unused friedland 12V 1.5A (I think model 3835) measured the voltage at something like 18V (within the 12-24V of the lamp) and connected to it. Measured the voltage at near 13V.

Only minutes later the light went out and the transformer was very hot.

 

[SUNRAY]

They are not poor crappy designs, just the opposite in fact. They are designed to perform a particular task and to do that task safely and reliably.

If there is any crap it is the lack of knowledge and the subsequent misuse of items ( such as bell transformers ) for a task they are not designed for.

Touche.

Guilty m'lud

 

[bernardgreen]

Don't worry, I also learnt the same lesson the hard way when, in my innocent and ignorant youth, I used a bell transformer to run a small lamp as well as the bell. Wired the lamp directly to the transformer and not in series with the bell.