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Hi, wich is a correct connection ? ( 1 or 2 ?)
because i see in many pictures 1 and 2 connections.
Is the same ?


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No, it's not the same, but it shouldn't matter. The neutral is equivalent to ground at the breaker box, but by the time the wires get to your specific outlet, there might be a little voltage difference with negligible current. Since this is a transformer-type power supply, it doesn't care where the AC is in relation to ground.

Black is hot, and white is neutral, if your house is wired correctly. Let's hope it is! :-)

Kyle

Mati is your mains voltage 120v or 240v?

110

Both are wrong by UL and international standards.

Line --> fuse --> switch --> transformer
Earth --> chassis
Neutral --> transformer

Cheers!