Re: Size for ground wires
Originally Posted by
Muzzer
Most supplies have a grounded neutral, so the DC negative wouldn't appreciate being grounded, you'd pop the breakers and possibly damage the PFC / rectifier. Not something to try!
.
Every DC supply I have ever used or built was isolated from the AC supply, they are either 50hz/60hz transformer and bridge etc, or SMPS, all typically isolated.
Therefore in all the above examples, there is no problem earth grounding the DC supply common.
Of course, in order to do this, the transformer secondary itself cannot be, and is usually not, grounded, this allows the DC common to be.
A good example is a tower or desk top PC, the power common is connected to earth GND via the screws securing the MB that are through the board ground plane to the earthed chassis.
where the service ground is also terminated.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.