On 1/15/19 7:20 AM, Nate Burke wrote:
I think this answers the why question "Some extra grounding was called
for as per engineers" They probably don't actually know why it's needed.
I just involved in a building project involving a 90hp Fire alarm
sprinkler pump. One single power phase kept randomly going to
undervoltage and setting the monitoring system into alarm. The
Manufacturer said "We don't know why it's doing it, try adding another
ground wire and see what happens" The Electrician said "That can't fix
it, but I'll do it because you said so" Well, it fixed it, for some
reason that nobody really understands or has been able to adequately
explain.
It'll eliminate potential difference. Now, exactly what problems that
can resolve or that may never be seen is usually random guessing. But,
when a voltage potential happens it will go somewhere and undesirable
things can happen if that somewhere is a signal line, so you keep it at
ground (or equal to the rest of the system).
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
