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Fluorescent Dimming Ballasts Tu-Wire® 5% High-Performance Dimming
Tu-Wire 5% 7 07.23.09
ATTENTION ELECTRICIANS
AND CONTRACTORS
Ballast/Socket Leads
Lead lengths from ballast to socket must not exceed
7 ft. (2 m) for T8 linear lamps, and 3 ft. (1 m) for T4
compact lamps.
Lamp Sockets
Quality lamp sockets are required to ensure positive
lamp-pin to socket contact. T8 lamps require knife-
edge sockets. U-bent lamps require locking sockets
and proper lamp support to hold lamp pins in full
contact with the socket.
Lamp Mounting for T8
Many fluorescent lamp sockets are available with
mounting slots to vary the height of the lamp away
from the grounded metal surface. Use these slots to
get the lamp glass to be 1/2 in ± 1/4 in away from
the grounded metal surface.
Having a fluorescent lamp too close to the grounded
metal will make the minimum intensity too low and
will reduce lamp life. Having a fluorescent lamp too
far away from the grounded metal will make the
lamp flicker or not turn on at all.
Lamp Mounting for T4
Keep lamps 3/8 in ± 1/8 in away from the
grounded metal surface.
Having a T4 lamp too close to the grounded metal
will not reduce lamp life but may cause a visible
difference in brightness along the length of the lamp.
Ballast Operating Temperature
Ballast case temperature must not exceed 75 °C at
any point on ballast.
Wiring and Grounding
All wiring from the dimming control to the Tu-Wire
ballasts is line voltage wiring and may be run
together in the same conduit.
Ballast and lighting fixture must be effectively
grounded. Ballasts must be installed per national
and local electrical codes.
Number of Ballasts Per Control
To calculate the maximum number of ballasts
allowed per control, divide control’s current capacity
by individual ballast current. Certain controls allow a
specific maximum number of ballasts.
ATTENTION
FACILITIES MANAGERS
PERFORMANCE
Lamps Seasoning Requirements
Some fluorescent lamp manufacturers recommend
that new fluorescent lamps be operated at full
output (“seasoned”) before they can be dimmed,
to render lamp impurities inert, ensuring proper
dimming performance and average rated lamp
life. Please contact your lamp manufacturer for
seasoning requirements.
SERVICE
Replacement Parts
Use replacement parts with exact Lutron model
numbers. Consult Lutron if you have any questions.
Further Information
For further information, please visit us at
www.lutron.com/ballasts or contact our 24-hour
Technical Support Center at 1-800-523-9466.