Re: Conduits in a trench

[backspace <sawireless2000@xxxxxxxxx>]

On Nov 27, 7:04 pm, "Robert L Bass" <RobertLB...@xxxxxxxxxxx> wrote:
> We're talking about two different concerns.  I was referring to
> ground strike lightning rather than AC issues.  When multiple
> structures are wired together and there's no bonded ground there is
> an added danger of lightning entering through one structure's ground,
> passing through your hardware and out through the other structure's
> ground.  Even in a single structure this is enough of an issue that
> the recommended procedure is to connect the grounds of all incoming
> services to a single point or to a bonded ground system.  With
> multiple buildings the danger can be worse than a single structure
> due to the increased potential between points.

There have been some interesting discussions concerning this on
Usenet. Some want only one point grounded, while others want both
points.
See http://scratchpad.wikia.com/wiki/CablingGuide for links on US
government documents outlining grounding procedures and
http://scratchpad.wikia.com/wiki/RS485