Wheatstone TV-80, Technical Manual

Page: 19 / 120

M A I N F R A M E I N S T A L L A T I O N
page 1 – 3
TV80 / Aug 98
CONSOLE
2-TRACK
MULTI-TRACK
AC BREAKER
BOX
DEVICE 1
DEVICE 2
DEVICE N
CONSOLE POWER SUPPLY
CONTROL ROOM POWER AMP
STUDIO POWER AMP
OTHER
POWER COMPANY
EARTH GROUND
HEAVY
(#4 or #6)
COPPER
WIRE
HIGH POWER
EQUIPMENT RACK
COPPER ROD
SOIL
3-wire ground or separate wire run from chassis
EFFECTS RACK
MIC PANEL
GND
TYPICAL SYSTEM
GROUNDING SCHEME
etc.
3–5 ft.
Tie the console ground lug
terminal strip to the system
earth ground. Tie every piece
of equipment in the entire
audio system to the console
ground lug terminal strip.
The system ground serves two important purposes:
(1) It provides a zero signal reference point for the entire audio system;
(2) It assures safety from electrical shock.
There exist two terms that one encounters in a discussion of ground:
(A) EARTH GROUND, which is usually a heavy copper rod driven into the
soil adjacent to the building (around 6 feet down) or a connection to the copper
water pipes leading into the building. Either is acceptable (unless, of course,
the water pipe is made of plastic).
(B) THE POWER COMPANY EARTH CONDUCTOR that enters the
building at the power line breaker box; this conductor should be (and is often
by code) tied to the above-mentioned earth ground at one point. This point is
the SYSTEM EARTH GROUND.
TIE THE CONSOLE GROUND LUG TERMINAL STRIP TO
THE SYSTEM EARTH GROUND. TIE EVERY PIECE OF EQUIP-
MENT IN THE ENTIRE AUDIO SYSTEM TO THE CONSOLE
GROUND LUG TERMINAL STRIP. If the system earth ground point
is inaccessible, tie the console ground terminal strip to the power
company earth conductor at the main breaker box (see drawing
"Typical Grounding Scheme" above).