9821 Desco, 9821 Datasheet - Page 4

• Manufacturer Part Number: 9821
• Description: CORD CMMN GRND 10MM W/RES 10'
• Manufacturer: Desco

Specifications of 9821

• Accessory Type: Ground, Common Point - for Bench Mat with Resistor
• For Use With/related Products: 2 Banana Plug Wrist Straps
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 9820R

TB-2007 Page 4 of 4
DESCO INDUSTRIES INC.
Employee Owned
Powerless...
can be grounded to a common bus
rod mounted near the workstations.
Their work surfaces should be
connected to the ground bus with
wire of 20-gauge minimum
diameter and preferably larger.
Heavy stranded wire may be
preferable to a less-durable solid-
conductor. The end of this
grounding bus should be bonded
to a convenient AC-equipment-
Our complete line of field
installable snaps makes grounding
a “snap”. Now you can place your
single ground point any place on
your work surface or floor mat.
Desco Makes Grounding
of Work Surfaces and Floor
Mats Fast and Easy
Workstations without AC power
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: http://www.desco.com
Snap assembly
installable with a rivet
hand tool.
19210
Our ground cords are designed to hook directly
onto any nearby “green wire” utility ground.
Ask for Technical Bulletin TB-2000 for details on
proper grounding and installation of ESD protective
surfaces or TB-2005 for proper maintenance and
grounding of wrist straps.
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
Our common point ground cords and testers
allow for “common point grounding”.
ground circuit. This type is shown
in Fig. 5.
in workstations wired with 120-
VAC can be used for grounding,
provided the circuit has been
tested and has passed. In
addition, the equipment-ground
circuit should be bonded
electrically to a workstation’s metal
frame if that frame is to be used as
common ground point.
be measured with the wiring
Universal
Screw-on Kit
Item No. 09864
Equipment-ground conductors
Continuity of less than 1 S can
Installing push and clinch snap for
use with multi-layer or soft
conductive mats Item No. 09863
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09740
analyzer(s) previously described. If
a workstation frame’s resistance is
too high, an approach similar to
that shown in Fig. 5 should be
used. In any event, for added
safety, such metal frames should
always be bonded securely to the
equipment ground.
Monitoring
of people and ESD-sensitive
electronics, all static-controlled
workstations should be periodically
tested for ground integrity.
However, even periodic testing
can’t detect an immediate break or
degradation in a grounding circuit.
When such a break is eventually
uncovered, it is often too late for
some parts, thus various constant
monitoring systems are available.
Figure 6 shows a block diagram of
such a monitor. These monitors
sound an alarm if an open circuit
of ground-circuit degradation
occurs. Unfortunately, some of
these monitors are undependable,
so it’s good policy to periodically
test not only ground integrity but
the associated monitors as well.
1. C.C. Kleronomos and E.C.
Cantwell, “A Practical Approach to
Establish Effective Grounding for
Personnel Protection,” IEEE IAS
Annual Conference Record, 1979.
2. R.H. Lee, “Electrical Safety in
Industrial Plants,” IEEE Spectrum,
June 1971.
3. C.F. Daziel, “Electrical Shock
Hazard,” IEEE Spectrum, February
1972.
4. National Electrical Code.
5. E.H. Russell, “Static-Safe
Worksurfaces and Personnel
Safety - Update,” Evaluation
Engineering, September 1986.
6. E.H. Russell, “Safely Grounding
Static-Control Worksurfaces,”
EOS/ESD Technology, June 1987.
To ensure the continuing safety
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09825