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USER GUIDE TB-9112
Common Point Ground Monitor
Installation, Operation and Maintenance
Figure 1. SCS Common Point Ground Monitor
Description
The SCS Common Point Ground Monitor confirms the
integrity of the resistance path from the common ground
point to electrical ground. It is designed in accordance
with ESD TR 12-01 to "monitoring equipment ground
connections."
When the Common Point Ground Monitor is plugged
into an electrical receptacle, its green LEDs illuminate
when both the power outlet's wiring is correct and
the path-to-equipment ground via the equipment
grounding conductor is intact. The monitor provides
12 verified ground points when in a PASS condition.
The monitor's red LEDs illuminate and audible buzzer
sounds when either the outlet's wiring is incorrect or the
path-to-equipment ground is defective. Mounting tabs
make it suitable to install in workbench or equipment
settings.
The outlet ground line is tested by measuring voltage
between it and the neutral line. It is normal to have
a few volts of AC induced on the neutral line. If the
Common Point Ground Monitor measures only a few
volts, the ground line to neutral impedance is low and
the ground line would make a suitable ESD ground
point. If the monitor measures more than just a few volts
between ground and neutral, this indicates either that
they are not referenced to each other or that the outlet
and associated wiring should be checked for loose
connections. In this case, the Common Point Ground
Monitor will sound a warning alarm and display a red
FAIL indication and should not be used for an ESD
grounding point until corrected.
TB-9112 Page 1 of 3
June 2021
Use the Common Point Ground Monitor to fulfill the
ANSI/ESD S6.1 section 6.3.1 requirement. "The hot,
neutral and equipment grounding conductor shall
be verified to be in the proper wiring orientation in
accordance with the National Electric Code (NFPA
70®)."
The Common Point Ground Monitor is available as the
following item numbers:
Item
Description
770048
Common Point Ground Monitor, with North
America Power Cord
770049
Common Point Ground Monitor, with UK
Power Cord
Packaging
1 Common Point Ground Monitor
6 Socket Head Screws, 10-32 x 1/4"
6 Split Washers, #10
2 Pan-Head Screws, #6 x 3/8"
1 Dual Lock Fastener Set, 2" Length
1 Hex Key, 5/32"
1 Power Cord, 6' Length
1 Certificate of Calibration
Made in the
United States of America
© 2021 DESCO INDUSTRIES INC
Employee Owned
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Table of Contents
Related Manuals for SCS 770048
Summary of Contents for SCS 770048
- Page 1 2 Pan-Head Screws, #6 x 3/8" Description 1 Dual Lock Fastener Set, 2" Length 1 Hex Key, 5/32" The SCS Common Point Ground Monitor confirms the 1 Power Cord, 6' Length integrity of the resistance path from the common ground 1 Certificate of Calibration point to electrical ground.
- Page 2 Features and Components Installation 1. Remove the Common Point Ground Monitor and its power cord from their carton. 2. Determine the mounting location of the Common Point Ground Monitor. Its LEDs should be visible to the operator. Secure the Common Point Ground Monitor to a surface using its mounting tabs and the included pan head screws or dual lock fasteners.
- Page 3 See the SCS Warranty - the risk of failure for the ESD protective equipment and StaticControl.com/Limited-Warranty.aspx materials. In general, SCS recommends that calibration be performed annually. NOTE: The following procedure should only be done by someone familiar with voltage hazards. This procedure will work for 220 VAC as long as the neutral and ground are referenced.
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