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> _Please let me know if there is anything wrong with this logic._
So far so good. The voltage clamp (3 zener diodes for European IS category iA and two for category iB) is the limiter on voltage and, providing you do not generate more then these zeners, it's virtually a rubber stamp job. It's likely you are going to be involved with North American standard but, they are similar. If you want to make comparisons I once found this wall-chart quite comforting when I was designing IS stuff (many projects over many years): -
![Image alt text](https://electrical.codidact.com/uploads/Fgz26J76oKL68Y1wMbV9jcdE)
~~It can be downloaded from [here](https://manualzz.com/doc/14075912/mtl-flammable-facts-poster).~~
For the zener barrier I'm fairly certain that you will need a fuse here: -
![Image alt text](https://electrical.codidact.com/uploads/J96nsx4tyAXBWW6MHb1M8x4o)
> _In particular, is the logic of the maximum output current from the flyback transformer convincing for IS purposes?_
No, use an extra fuse is my advice as per the modified diagram.

> _Please let me know if there is anything wrong with this logic._
So far so good. The voltage clamp (3 zener diodes for European IS category iA and two for category iB) is the limiter on voltage and, providing you do not generate more then these zeners, it's virtually a rubber stamp job. It's likely you are going to be involved with North American standard but, they are similar. If you want to make comparisons I once found this wall-chart quite comforting when I was designing IS stuff (many projects over many years): -
![Image alt text](https://electrical.codidact.com/uploads/Fgz26J76oKL68Y1wMbV9jcdE)
It can be downloaded from [here](https://www.mtl-inst.com/images/uploads/datasheets/posters/Eaton_MTL_FlamFacts_Poster_2015.pdf).
For the zener barrier I'm fairly certain that you will need a fuse here: -
![Image alt text](https://electrical.codidact.com/uploads/J96nsx4tyAXBWW6MHb1M8x4o)
> _In particular, is the logic of the maximum output current from the flyback transformer convincing for IS purposes?_
No, use an extra fuse is my advice as per the modified diagram.