Cut Sheet

Page 2 of 2
WIRING AND INSTALLATION
For New Sign Construction:
1. Run black wire (L) to all sockets on one side of sign and white wire (N) to all sockets on other end of sign.
2. Install LED lamps into sockets. Ensure the ends marked L and N correspond with the wiring of the sockets.
3. Rotate lamps to desired direction for application.
4. Ensure all black wires are joined together. Ensure all white wires are joined together. Should be accessible in raceway for easy field installation.
Keystone Technologies • 1390 Welsh Road, North Wales, PA 19454 • Phone [phone] • www.keystonetech.com
Specifications subject to change. Last revised on 10.15.18
4. Access sign raceway/wiring box, and cut
all ballast input and output wires as shown.
Do not remove ballast if removal leaves an
opening in the raceway.
5. From mains, connect input (L) line to all
wires coming from sockets on one side of sign
and (N) neutral to all wires coming from the
sockets on opposite end of the sign.
6. Insert Keystone Sign Hero LED tubes and
rotate to desired position for optimal illumination.
Ensure side marked “L” is connected to
corresponding line socket and “N” is
connected to corresponding neutral socket.
x
x
x
x
x
x
x
x
x
BALLAST
L N
7. Place retrofit warning label on existing
ballast (if applicable) or somewhere in sign.
Ensure it is visible for all future maintenance.
Close sign and apply power.
1. Ensure power is disconnected and open
the sign. 2. Remove fluorescent lamps from sign.
Lamp
Ballast
3. Inspect existing sockets to ensure they are
in good shape, replace if needed.
For Field Retrofit:
KT-LED21T8-48P2S-8XX-D