TB-9112 Page 1 of 3

© 2021 DESCO INDUSTRIES INC

Employee Owned

SCS - 926 JR Industrial Drive, Sanford, NC 27332

East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com

June 2021

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.

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

Common Point Ground Monitor

Installation, Operation and Maintenance

Made in the

United States of America

USER GUIDE TB-9112

Figure 1. SCS Common Point Ground Monitor