Simple Earthing rules for a) safety and b) good practice

Exploratory: Trace reliable Earth or Ground point as being permanently
intact at a proper or fatter gauge to your incoming supply board. If poss,
separate ground ring bus of supply outlets for programme equipment
from ground ring bus of those needed just for utility purposes.

Recommended: Use RCD breakers on each ring - to trip should a leakage fault
situation arise. You can simulate such a fault with the Test button which
should be pressed at least once a fortnight if poss.
Always ground each bay or rack (bond it to supply outlet ground so it's
always safe, never ever compromise its ground status) and every piece of
rack-mounted or free-standing equipment that has a metal case or fascia or
connector shields (unless it is "domestic" and has a 2-pole mains lead/cord,
say, fig-8), to a clean ground.

Ensure main mixer's tech ground and monitor amps are grounded close to one
another. This is the production area nucleus.

Never bother to attach the screen of a "balanced" output circuit at the
detachable plug-in connector, unless cable is going via Source jackfield.
See next....
Always attach the screen at the detachable plug-in connector to the
"balanced" input (mic or line) cct and at the Destination jackfield.
On jackfields never link sleeve of upper jack to sleeve of lower jack if
normalling exists between them!


Check out, on amplifiers that are hum-prone, that the input screen is
traceable to
a point nearest 0V (common rail of dual polarity PSU or of single rail PSU)
of storage electrolytic, which if single rail is often made to chassis.

Try to add Earth/Ground lift toggles connecting/isolating pin1 at o/p XLRs
of portable mains-operated gear, and at DA o/ps where necessary or when
feisable.

Jim


"hank alrich" wrote in message
.. .
kevindoylemusic wrote:

Watch out for grounding problems that will produce a buzz/hum and/or
potential live voltage. You will have at your disposal a ground lift
switch on the power bar and a ground lift switch on the DI box to get
rid of the ground problem.

People, this kind of advice can get you killed. Just don't do it, and
before you jump to conclusions, hit Google and catch Scott Dorsey's
comments on this bright idea.

You don't get rid of "grounding problems" by getting rid of _ground_ if
you have both a brain and a desire either to keep living or to avoid
killing someone else.

If Kevin Doyle actually suggests this, his PHD is meaningless and he
should be sent back to grade school. If he doesn't suggest this, then
maybe he ought to get his students' heads out of his ass.

--
ha