Specification

The GTD20A as a switch bypass device
Application
The GTD20A works in conjunction with an auxiliary
generator or central inverter system to power
designated lighting loads up to 20 amps regardless
of local switch position. The device consists of
relay switching circuitry in a single, wall-mountable
enclosure. The GTD20A senses the loss of normal
power and, in response, switches the lighting
load to a designated emergency power source.
The device can be used to: (1) transfer a lighting
load from normal power to generator or central
inverter system power when normal power is lost;
(2) bypass a wall switch to allow generator- or
central inverter system-supplied lighting loads to
energize when normal power is lost; (3) bypass
a dimming panel and prevent backfeed to allow
lighting to energize at full brightness when normal
power is lost; and (4) bypass most dimming
controls using an auxiliary relay contact. The
GTD20A includes three dry form C contacts, which
allows the user a wide variety of wiring options.
For additional applications and information,
contact the factory. The GTD20A is suitable for
use in indoor and damp locations.
Operation
The GTD20A senses the loss of normal power and
switches the lighting load, connecting it to a an
emergency lighting circuit. No routine maintenance
is required to keep the GTD20A functional;
however, like other life safety unit equipment, it
should be checked periodically to ensure that it is
working properly.
Installation
The GTD20A does not affect normal fixture
operation and comes fully assembled for immediate
installation. In addition to available wiring, the
device requires a direct, unswitched connection
to a normal power circuit and, depending on
the application, an unswitched connection to a
generator-supplied or central inverter system-
supplied emergency panel. See diagrams above for
typical installations.
UL and Code Compliance
The GTD20A has been tested by Underwriters
Laboratories in accordance with standards set
forth in UL 1008 for Automatic Transfer Switches
(BCELTS) and UL 924 for Emergency Lighting Switch
Bypass Devices (ALCRs). The GTD20A also complies
with the requirements set forth in the CSA C22.2
No.141 standard for emergency lighting equipment.
The GTD20A is UL Listed for field installation.
Specification
Emergency lighting shall be provided by using
existing lighting loads equipped with a Bodine
GTD20A lighting relay control device. The device
shall be capable of bypassing the local switching
means when normal utility power has been lost. The
device shall consist of relay switching circuitry, a
test switch, a normal power indicator light and an
alternate power indicator light contained in one 9”
x 6” x 3.5” enclosure; shall sense normal power at
120 through 277 VAC, 50/60 Hz; shall be rated for
120 through 277 VAC, 50/60 Hz at up to 20 amps
of lighting load; shall draw 45 mA and 4.0 Watts
during normal sensing operation; and shall comply
with the current NEC. The device shall be UL Listed
for field installation in indoor or damp locations and
shall be warranted for a full five years from date of
purchase.
Warranty
The GTD20A generator transfer device is warranted
for five (5) full years from date of purchase. Please
see detailed warranty information on our web site.
The GTD20A as a BCELTS
GTD20A Lighting relay control device
© 2019 Signify Holding. All rights reserved. The information provided herein is subject to change,
without notice. Signify does not give any representation or warranty as to the accuracy or
completeness of the information included herein and shall not be liable for any action in reliance
thereon. The information presented in this document is not intended as any commercial offer and
does not form part of any quotation or contract, unless otherwise agreed by Signify. All trademarks
are owned by Signify Holding or their respective owners.
GTD20A.spec.L8000049 02/20 page 2 of 2
Signify North America Corporation
Bodine
236 Mt. Pleasant Road
Collierville, TN 38017 USA
Telephone: [phone]
Signify Canada Ltd.
281 Hillmount Road,
Markham, ON, Canada L6C 2S3
Telephone [phone]
www.bodine.com
WIRE GAUGES FOR ALL LEA DS
TERMINATING AT T2 SHOULD BE #18 AWG.
JUMPER CONNECTION S ON T1 AND T2 ARE
CONTRACTOR INSTALLED.
WIRE GAUGES FOR ALL LEA DS
TERMINATING AT T2 SHOULD BE #18 AWG.
JUMPER CONNECTION S ON T1 AND T2 ARE
CONTRACTOR INSTALLED.