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01.4IB.46300
Safety
3. Service conditions and controller
applications shall also be considered in the
development of safety programs. Variables
include ambient temperature; humidity;
actual continuous current; thermal cycling;
number of operations; interrupting duty;
and any adverse local conditions including
excessive dust, ash, corrosive atmosphere,
vermin, and insect infestations.
D. s
peciFic
1.
DO NOT WORK ON AN ENERGIZED CLASS
E2 MEDIUM VOLTAGE CONTROLLER.
Before performing maintenance work
on a Class E2
Medium Voltage Controller,
deenergize and disconnect the power
supply for the controller, and remove the
Class E2
Medium Voltage Controller from
service.
2.
DO NOT WORK ON AN ENERGIZED
MEDIUM VOLTAGE VACUUM
CONTACTOR.
Before performing work on
a vacuum contactor, remove the vacuum
contactor from service and remove it from
the Class E2
Medium Voltage Controller.
3.
DO NOT WORK ON A CLASS E2
MEDIUM
VOLTAGE CONTROLLER VACUUM
CONTACTOR WHEN THE CONTROL
CIRCUIT IS ENERGIZED.
4.
EXTREME CARE MUST BE EXERCISED
TO KEEP ALL PERSONNEL, TOOLS, AND
OTHER OBJECTS CLEAR OF MECHANISMS
WHICH ARE TO BE OPERATED,
DISCHARGED, OR RELEASED.
These
contactors utilize high energy mechanisms.
These mechanisms must be serviced only
by skilled and knowledgeable personnel.
Detailed information regarding these
mechanisms is found in this instruction
bulletin and in the instruction bulletin for
the vacuum contactors.
5.
DO NOT ATTEMPT TO MANUALLY CLOSE
THE VACUUM CONTACTOR ON AN
ENERGIZED CIRCUIT.
6.
DO NOT USE AN OPEN VACUUM
CONTACTOR AS THE SOLE MEANS OF
ISOLATING A HIGH VOLTAGE CIRCUIT.
FOR COMPLETE ISOLATION, THE
ISOLATING SWITCH MUST BE IN THE
OFF POSITION.
7.
ALL COMPONENTS SHALL BE
DISCONNECTED BY MEANS OF A
VISIBLE BREAK AND SECURELY
GROUNDED FOR THE SAFETY
OF PERSONNEL PERFORMING
MAINTENANCE OPERATIONS ON
THE CLASS E2
MEDIUM VOLTAGE
CONTROLLER.
8. Interlocks are provided to ensure the
proper operating sequences of the Class
E2
Medium Voltage Controller and vacuum
contactors for the safety of the user.
If for
any reason an interlock does not function
as described,
DO NOT MAKE ANY
ADJUSTMENTS, MODIFICATION, OR
DEFORM THE PARTS. DO NOT FORCE
THE PARTS INTO POSITION. CONTACT
POWELL FOR INSTRUCTIONS.
e. x-r
ays
X-Rays may be generated when high voltage
is applied across the contacts of a vacuum
interrupter. The intensity of x-radiation
depends on the level of peak voltage and
the size of the contact gap. At the normal
operating voltage for this type of equipment,
the x-radiation levels are negligible. At the
voltages specified for testing, personnel shall
be located no closer than one (1) meter (about
3 feet) from the vacuum contactor.
THE
VACUUM CONTACTOR SHALL BE EITHER
FULLY OPEN, OR FULLY CLOSED WHEN
MAKING HIGH POTENTIAL TESTS. DO
NOT PERFORM TESTS WITH CONTACTS
PARTIALLY OPEN.
