Tweco CE PAK Master 150XL Without Latch Circuit - Manual (Page 31)

Manual 0-2696 3-13 INSTALLATION
C. Creating An Earth Ground
1. To create a solid, low resistance, earth ground, drive a
1/2 in (12 mm) or greater diameter copper clad ground
rod at least 6 - 8 ft (1.8 - 2.4 m) into the earth so that the
rod contacts moist soil over most of its length. Depend-
ing on location, a greater depth may be required to
obtain a low resistance ground (see NOTE). Ground rods,
typically 10 ft (3.0 m) long, may be welded end to end for
greater lengths. Locate the rod as close as possible to the
work table. Install a ground wire, 1/0 AWG (European 50
mm
2 ) or greater, between the ground rod and the star ground
point on the cutting table.
NOTE
Ideally, a properly installed ground rod will have
a resistance of three ohms or less.
To test for a proper earth ground, refer to the following
diagram. Ideally, the reading on the multimeter should be
as follows:
• For 115VAC: 3.0 VAC
• For 230VAC: 1.5 VAC
Art # A-02971
+
_
Meter set to
VAC setting
Neutral
Line (Hot)
100W
Light Bulb
115 or 230VAC
WARNING
Use extreme caution. This
test uses live voltage.
115VAC: 3.0 VAC
230VAC: 1.5 VAC
V ~
V
~
VR COM A
Ground
Rod
Ground Testing
CAUTION
No other connections should be made at the
ground rod being tested. This test assumes that
the 115 or 230-VAC source neutral is connected
to the utility earth ground.
2. Increasing the ground rod length beyond 20 - 30 ft (6.1 – 9.1
m) does not generally increase the effectiveness of the
ground rod. A larger diameter rod which has more surface
area may help. Sometimes keeping the soil around the
ground rod moist by continuously running a small amount
of water into it will work. Adding salt to the soil by soaking
it in salt water may also reduce its resistance. When these
methods are used, periodic checking of the ground resis-
tance is required to make sure the ground is still good.
3. The following illustration shows proper connection of a
customer-supplied ground cable to a grounding stud pro-
vided on the rear panel of the power supply.
Art # A-04371
Ground Cable
Ground Cable Connection to Power Supply