Desco TB-2003 Installation Manual

The 09740/09741, 09835/09836 and
09820/09821/09825/09826/ are shipped with an
extra ring terminal so that the ground wire may
be cut to length during installation. The
09740/09741 and 09835/09836 feature a pair of
mounting holes designed to accommodate
standard #10 screws, allowing the units to be
mounted to the work bench.

Proper Grounding

Wrist straps, work surfaces, floor mats and other
electrostatic discharge (ESD) protective
products should be grounded to a common point
ground.

COMMON POINT GROUND

Per ANSI/EOS/ESD S6.1, Grounding paragraph

4.1.1 "Every element to be grounded at an ESD
protected station shall be connected to the same
common point ground."

ESD Handbook TR 20.20 paragraph 5.1.3 Basic
Grounding Requirements "The first step in
ensuring that everything in an EPAis at the
same electrical potential is to ground all
conductive components of the work area
(worksurfaces, people, equipment, etc.) to the
same electrical ground point. This point is called
the common point ground. The next step in
completing the ground circuit is to connect the
common point ground to the equipment ground
(third wire, green)."

If all elements are connected to the common
point ground, even if the equipment ground
connection is compromised, all workstation
elements will be connected and be at equi­potential or at the same charge. Being at the
same electrostatic charge will mean that no
discharge should occur.

Connect the ground wire directly to the nearest
utility “green wire” ground point. In a properly
wired building, the “green wire” equipment
ground point may be the center screw of the
standard 110VAC outlet. Some special outlets
may “float” the center screw. Test before you
hook up.

Figure 7. Recommended grounding point.

Individual work stations must be individually
grounded to the “green wire” equipment ground.
For ESD worksurface installation information,
see Desco Technical Bulletin TB-2000.

TB-2003 January 2009 Page 1 of 2

Common Point Grounding Unit s
Inst allation Instructions

Description

Per ANSI/ESD S20.20, all conductors, including
personnel, must be electrically connected and
attached to a known ground. EOS/ESD S6.1
recommends hard ground, without resistor, of
worksurface or floor mats. Per ANSI/ESD
S20.20, ground fault circuit interrupters (GFCI)
should be considered to provide personnel
protection.

Desco offers a number of common point
grounds and wrist strap ground connectors
designed to ground multiple operators or items.

Figure 1. 09740/09741 wrist strap bench ground.

The 09740/09741 wrist strap bench ground is a
wrist strap ground connector and consists of a
mounting bracket with two standard banana
jacks installed and soldered to a ten foot ground
wire terminated with a ring terminal with a

0.200" hole.
The 09741 includes a wrist strap parking station.

See figure 2.

Figure 2. 09741 premium bench mounted
ground with parking station

The 09837 Multi Grounding Hub is designed for
use as either a wrist strap ground connector or
as a common point ground for all items to be
grounded at a bench (i.e. table mat ground cord,
floor mat ground cord, banana jack ground
block, etc.). The Multi Grounding Hub

Figure 3. 09837 Multi Grounding Hub

incorporates six standard banana jacks, and six
terminations for ring terminals (10-32 screw in
threaded holes).

Figure 4. 09835/09836 quad common point
ground

The 09835/09836 quad common point ground is
designed for use as either a wrist strap ground
connector or as a common point ground. The
quad ground incorporates four standard banana
jacks, a 10mm snap stud, and ten feet of ground
wire terminated with a ring terminal with a

0.200" I.D. hole. The model 09835 also
incorporates a 1 megohm resistor in series with
the snap stud.

Figure 5. 09820/09821/09825/09826
common point ground.

The 09820/09821/09825/09826 common point
ground is designed to ground bench mats by
snapping on the mat’s stud, and to provide a
convenient wrist strap ground connector. Items
09820/09821 incorporate two standard banana
jacks, a 10mm snap socket, and 10 feet of wire
terminated with a ring terminal with a 0.200" I.D.
hole. Items 09825/09826 have a 10mm snap
stud and 15 feet of wire. Items 09821/09826
also incorporate a one megohm resistor in
series with the snap.

Figure 6. All elements at the ESD work station
should be connected to the same common point
ground, such as 09837 Multi Grounding Hub.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: http://www.desco.com

“GREEN WIRE”

EQUIPMENT

GROUND

POINTS

RING TERMINAL

CAN BE

ATTACHED

HERE

TECHNICAL BULLETIN TB-2003

Made in America

© 2009 DESCO INDUSTRIES INC.

Employee Owned

BANANA PLUG

CAN BE

ATTACHED

HERE

BANANA PLUG

CAN BE

ATTACHED

HERE

TB-2003 Page 2 of 2

Always Test the Ground
Before You Use It and
Periodically Thereafter

You should not assume that any electrical outlet
is properly wired. Even if it was originally wired
correctly, it can become ungrounded due to
corrosion and wear. Test the equipment ground
you intend to use before you hook up. Use
Desco 98130 AC Outlet Analyzer to verify proper
wiring of the electrical outlet (equiment ground).

Installation

After you have selected and tested your
grounding point, you will need to determine the
method of installation for the type of grounding
block that you have selected. Installation of
common point units as grounding blocks is
outlined below. Installation of the 09835/09836
and 09820/09821/09825/09826 as common
point ground cords for a work surfaces is also
discussed below.

WRIST STRAP GROUND CONNECTORS

1. Select the most convenient location on the
work bench for grounding of wrist straps and
other grounding devices.

2. Position the 09740/09741 or 09835/ 09836
and use the two #10 mounting holes to secure
to the work bench.

3. Bring the wire neatly back to your grounding
point. You may wish to use wire brackets to hold
the wire in place and out of the way. Cut and
strip the end of the wire to properly fit your
ground point. Install and crimp the extra ring
terminal provided.

Figure 8. Installation of grounding blocks.

4. To check resistance, use an ohmmeter from
the banana jacks to the common ground point. It
should read less than 1 Ohm AC impedance for
items 09740/09741, 09820/09825 and 09835
and 1 megohm (106 ohms) for items 09836 and
09821/09826.

GROUNDING POINT

As previously mentioned, the 09835/09836 and
the 09820/09821/09825/09826 can be installed
as a wrist strap ground connector for ESD
protective work surfaces.

1. Position or lay the work surface in the desired
location. Snap the ground to it. These units
connect with a 10mm socket snap.

2. Bring the other end of the ground cord to a

verified grounding point and attach it using the
ring terminal. Tie the ground wire to the bench to
keep it neatly out of the way. You may cut and
strip the ground wire to a shorter length and
attach it using the extra ring terminal included
with each ground cord.

3. After installation, the work surface along with
the banana jacks are all electrically connected to
ground. The banana jacks will now serve as
wrist strap ground connectors.

4. To check resistance, use an ohmmeter from
the ground point snap on the mat to the
common ground point. It should read 1 megohm
±20 percent if you are using a model 09836,
09821, or 09826 ground cord, and less than 1
Ohm AC impedance if you are using a 09835,
09820, or 09825 non-resistor ground cord.

MULTI GROUNDING HUB

The 09837 Multi Grounding Hub can be
mounted either on a bench leg or table top. See
Figure 10 for installation.

Figure 10. Installation of multi grounding hub.

Maintenance

You should set up a an auditing schedule to be
sure that all ESD grounds are inspected and
tested per your compliance verification plan
required by ANSI/ESD S20.20. Some
companies test once every six months.

Figure 9. Installing the 09835/09836 and
09820/09821/09825/09826 as a common point
ground cord for a work surface.

09835/09836

09820/09821/09825/09826

Limited Warranty

Desco expressly warrants that for a period of
one (1) year from the date of purchase,
Desco grounding products will be free of
defects in material (parts) and workmanship
(labor). Within the warranty period, the
product will be tested, repaired, or replaced
at Desco’s option, free of charge. Call our
Customer Service Department at 909-627­8178 (Chino, CA) or 781-821-8370 (Canton,
MA) for a Return Material Authorization
(RMA) and proper shipping instructions and
address. Include a copy of your original
packing slip, invoice, or other proof of
purchase date. Any unit under warranty
should be shipped prepaid to the Desco
factory. Warranty repairs will take
approximately two weeks.

If your unit is out of warranty call Customer
Service at 909-627-8178 (Chino, CA) or 781­821-8370 (Canton, MA) for a Return Material
Authorization (RMA) and proper shipping
instructions and address. Ship your unit
freight prepaid. Desco will quote repair
charges necessary to bring your unit up to
factory standards.

Warranty Exclusions

THE FOREGOING EXPRESS WARRANTY
IS MADE IN LIEU OF ALL OTHER
PRODUCT WARRANTIES, EXPRESSED
AND IMPLIED, INCLUDING MERCHANT­ABILITY AND FITNESS FOR A PARTICU­LAR PURPOSE WHICH ARE SPECIFI­CALLY DISCLAIMED. The express warranty
will not apply to defects or damage due to
accidents, neglect, misuse, alterations,
operator error, or failure to properly maintain,
clean or repair products.

Limit of Liability

In no event will Desco or any seller be
responsible or liable for any injury, loss or
damage, direct or consequential, arising out
of the use of or the inability to use the
product. Before using, users shall determine
the suitability of the product for their intended
use, and users assume all risk and liability
whatsoever in connection therewith.

09740/09741

09835/09836

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: http://www.desco.com

© 2009 DESCO INDUSTRIES INC.

Employee Owned

09837

09837