Re: Size for ground wires
Originally Posted by
wmgeorge
To clear up confusion, the DC and signal power negative
( - ) should not be tied to equipment ground unless instructed (?) as its not the same thing as it carries voltage.
Yeah, there is two thoughts on this, some practice never grounding the power commons of different sections of equipment, IOW keep all power separate, and the opposing view on grounding at all times if it is possible.
I have always prescribed to the latter, whether the equipment supplier has decreed it or not.
I know of a few instances here in the past where posters have had 'noise' issues caused by false triggering of inputs due to injection of noise which can be inductive or capacitively coupled. Such problems were cured after grounding all power common.
There is also a practice that was outlined in a Siemens paper covering the importance of something called equi-potential bonding, this ensures that all metallic parts of a machine are at the same ground potential, this practice virtually eliminates the occurrence of Ground Loops.
The above has so far kept me in good stead!
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.