Is this main breaker box and subpanel setup correct?

[DIYpowered]

Hello

This is the main breaker box in the house downstairs:


And this is the other breaker on the first floor found right above the main breaker box:


I want to understand what these breakers mean (are these values correct?) and if the setup has been done correctly (i checked some YouTube videos and it seems like the main breaker in this case might be the 63A but it should have been installed on the far-left side?). I counted the breaker total Amps and it comes to 66A but the main breaker is only 63A??

I also want to check if the neutral busbar (if it even exists in this connection box?) has been connected to the ground busbar in the main breaker box. Is it safe for me to unscrew it just to check inside? I can see two Philips screws on each side of the panel.

Thanks in advance for any help.

 

[JohnD]

Which country are you in?

 

[JohnD]

I counted the breaker total Amps and it comes to 66A but the main breaker is only 63A??

That is quite normal.

It is considered highly improbable that all the circuits in your house would be drawing maximum current at the same time (or, indeed, ever).


The principle is called "diversity " and there are some rules for calculating it, I don't know what they will be in your country, but your figures look fine.

 

[DIYpowered]

Which country are you in?

It's under my avatar. If you hover your cursor over the flag, it says, Mauritius.