Yea, agreed, this was the whole reason behind this installation, to get the rack on its own circuit. Any issue making this a 32A circuit?
Easy to do, just heavier cable, etc. But why?
- If it is a single 13A socket then 13A is max.
- If double then typically they are rated at 20A between the two.
- If you are actually using much more than 13A on your IT kit you will have both an eye-watering electricity bill, and a need for A/C to keep the area cool.
I'm going to start reeling it back on the AFDDs though, maybe have this new circuit, shower and garage with them and rest on RCBOs. Although, as I mentioned previously, Hager RCBOs are single pole so I might have to just settle for another brand that the electrician will recommend.
While you get AFDD in all sorts of ratings, for now the main push has been to have them on socket outlet circuits, presumably because of more risk from arcing from damaged cables / plugs / etc. Inspecting and testing your appliances ("PAT testing") might give you better prevention for the money.
Anecdotally the higher risk of overheating has been high power circuits like cookers & showers that were badly installed so terminals incorrectly tightened and/or poor quality or inappropriate parts used. Often they don't arc as it is basically just a high resistance contact.
RCD/RCBO provide a lot of the protection for general cable damage due to rodents, crushing, nailing, etc., that could cause a fault that creates heat but is not "hard" enough to trip the over-current protection, and so go some way towards reducing the fire risk anyway. With RCBO you find our which circuit is faulted quickly, and don't get healthy ones tripping as well. Also less risk of nuisance tripping as less accumulation of leakage as less appliances per circuit.
Finally, I guess you have a good interlinked smoke alarm system (like Aico, etc)? That is probably a far more important safety aspect then AFDD versus RCBO!