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Effective December, 1998
IL 33-DAH-1
SAFETY PRECAUTIONS
POWER CIRCUIT BREAKERS ARE EQUIPPED
WITH HIGH SPEED, HIGH ENERGY OPERATING
MECHANISMS. THE BREAKERS AND THEIR
ENCLOSURES ARE DESIGNED WITH SEVERAL
BUILT-IN INTERLOCKS AND SAFETY
FEATURES INTENDED TO PROVIDE SAFE AND
PROPER OPERATING SEQUENCES. TO PRO-
VIDE MAXIMUM PROTECTION FOR PERSON-
NEL ASSOCIATED WITH THE INSTALLATION,
OPERATION, AND MAINTENANCE OF THESE
BREAKERS, THE FOLLOWING PRACTICES
MUST BE FOLLOWED. FAILURE TO FOLLOW
THESE PRACTICES MAY RESULT IN DEATH,
PERSONAL INJURY, OR PROPERTY DAMAGE.
• Only qualified persons, as defined in the National
Electric Code, who are familiar with the installa-
tion and maintenance of power circuit breakers
and their associated switchgear assemblies
should perform any work associated with these
breakers.
Digitrip Retrofit System for Westinghouse DA-75 Breakers
• Completely read and understand all instructions
before attempting any installation, operation,
maintenance, or modification of these breakers.
• Always turn off and lock out the power source
feeding the breaker prior to attempting any
installation, maintenance, or modification of
the breaker. Do not use the circuit breaker as
the sole means for isolating a high voltage
circuit. Follow all lockout and tagging rules
of the National Electric Code and all other
applicable codes, regulations, and work rules.
• Do not work on a closed breaker or a breaker
with the closing springs charged. Trip (open) the
breaker and be sure the stored energy springs
are discharged before performing any work. The
breaker may trip open or the charging springs
may discharge, causing crushing or cutting
injuries.
• For drawout breakers, trip (open), and then
remove the breaker to a well-lit work area before
beginning work.
• Do not perform any maintenance: including
breaker charging, closing, tripping, or any other
function which could cause significant movement
of the breaker while it is on the extension rails.
Doing so may cause the breaker to slip from the
rails and fall, potentially causing severe personal
injury to those in the vicinity.
• Do not leave the breaker in an intermediate
position in the switchgear cell. Always leave it
in the connected, disconnected, or (optional)
test position. Failure to do so could lead to
improper positioning of the breaker and
flashover, causing death, serious personal
injury, and / or property damage.
• Do not defeat any safety interlock. Such
interlocks are intended to protect personnel
and equipment from damage due to flashover
and exposed contacts. Defeating an interlock
could lead to death, severe personal injury,
and / or property damage.
WARNING