If the pool db feeds swimming pool only - has a separate isolator mounted above the DB as required under fixed appliance then it can be a fixed appliance.
Something I have never seen ... an isolator above the DB ... mainly because the Pool DB has a main switch pre wired in the DB ... so if there is no isolator before the DB its a Sub DB.
Comments are based on opinion...not always facts....that's why people use an alias.
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