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I think all the crests all have MCB power switches although only one output on the distro at a time might even approach full load,
None of the outputs will get anywhere near full load with one of those amplifiers plugged into it.
so I don't need MCBs on 20amp powercons.
Yes you do, you can't have a 20A connector directly fed by a 32A supply, you need an OCPD.
Regarding the ammeters. I have a 20amp on (for the 16 amp passthrough) and a 100amp ammeter for the input. I put one of these (but the DC one on my car after I installed a stereo) I recognised them on the penn elcom distro immediately and figured why not. I want the ammeters because I plan on being able to draw every watt of safe power I can.
As Lucien has already said above you need to ensure that these meters will be safe under fault conditions and not explode and start a fire. How are you protecting these meters against faults?
I was looking at just running a DIN rail across the centre of the casing inside with a bracket and some 2-6mm 3x12 way terminal blocks. 6mm from the 32amp in... then 4mm to each white powercon socket and the 16amp ceeform.
You need protective devices in there, you can't just join everything together. Everything will need RCD protection, the Powercon need 20A protection, the 16A outlets need 16A protection.
Again this is why I'm asking this stuff. Eventually I will probably want to do a 63/120a single or a some sort of 3phase. I work in IT mainly so like once every now and then I have to plug a 120a ceeform into the bottom of a rack.
If you're working on big enough gigs that the PA system needs a 63A single phase supply then why on earth are you messing around with making it yourself? If there isn't enough money in a gig if that scale to hire or buy the distro then you're really not charging enough.