Desco 19219 Installation Manual

TECHNICAL BULLETIN TB-3049

Ground Hub Continuous Monitor
Operation, Installation and Maintenance

The Ground Hub Continuous Monitor is available in the
following models:

Item Voltage Plug

19219 120VAC N. America

19224 220VAC Asia / UK

Packaging

1 Ground Hub Monitor
6 10-32 x 1/4" Screws
6 #10 Split Washers
1 Certificate of Calibration

Figure 1. Desco 19219 Ground Hub Continuous Monitor

Features and Components

Ground Hub

Made in America

Neutral

Load / Hot

Ground

Figure 2. Desco 19224 Ground Hub Continuous Monitor

Description

The Desco Ground Hub Continuous 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 Ground Hub Continuous Monitor is plugged into
an AC outlet, the green LED illuminates when both the
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 PASS condition.
The red LED illuminates when either the outlet’s wiring is
incorrect or the path to equipment ground is defective.

Use the Ground Hub Continuous 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 (ANSIINFPA-70).”

Outlet Status

FRONT VIEW BACK VIEW

Figure 3. Desco 19219 Ground Hub Continuous Monitor
features and components

Earth

Load / Hot

Neutral

Outlet Status

Earthing Point

FRONT VIEW BACK VIEW

Figure 4. Desco 19224 Ground Hub Continuous Monitor
features and components

TB-3049 Page 1 of 3

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com

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

February 2011

© 2011 DESCO INDUSTRIES, INC.

Employee Owned

Operation

Plug the Ground Hub Monitor into an outlet to see if the
green PASS LED illuminates. This signifies that the outlet
is correctly wired and the path to equipment ground is
intact. The screw that holds the outlet cover on may be
used to secure the Ground Hub Monitor so that it cannot
be unplugged. Use the included screws and split washers
to connect ring terminals (not included) to the Ground Hub
or the banana jacks (not included) to connect banana plugs
(see Figure 5).

(Wires not included)

Figure 5. Installing ring terminals and banana plugs to
the Ground Hub

Calibration

The Ground Hub Monitor is calibrated to NIST traceable
standards. Calibration may be performed to insure that the
tester is operating within limits. We recommend annual
calibration of our monitors.

TESTING THE GROUND HUB MONITOR (19219 ONLY)

NOTE: The following procedure should only be done by
someone familiar with voltage hazards. This procedure
does not apply to item 19224 because Asia and the United
Kingdom do not reference GROUND to NEUTRAL as the
United States does.

Isolate the ground plug from the Ground Hub Monitor by
inserting the monitor into a 3 to 2 plug adapter.

A. PASS OUTLET - Connect a 5 kilohm resistor @ 5%
tolerance across the Neutral Plug and
Ground Plug. The PASS LED should
remain illuminated until the resistor is
removed. This test confirms the PASS
point for the neutral-to-ground
resistance.

B. FAIL OUTLET - Connect a 12.5 kilohm resistor @ 5%
tolerance across the Neutral Plug and
Ground Plug. The FAIL LED should
remain illuminated until the resistor is
removed. This test confirms the FAIL
point for the neutral-to-ground
resistance.

Figure 6. Ground Hub Continuous Monitor in-use photo

Specifications

Input Voltage:

120VAC ±15% (Item 19219)
220VAC ±15% (Item 19224)

Current Drain:
< 10mA

Equipment Ground Conductor Resistance Limits:

10 kilohms (nominal) (19219 only)

Dimensions:

2.0" x 3.0" x 1.3" (5.1cm x 7.6cm x 3.2cm) (Item 19219)

2.0" x 3.0" x 2.0" (5.1cm x 7.6cm x 5.1cm) (Item 19224)

Operating Temperature:

0° - 40°C

TB-3049 Page 2 of 3

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com

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

© 2011 DESCO INDUSTRIES, INC.

Employee Owned