Megger 651403, Instruction Manual

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AVTM6514J Rev. A (03/2003)
6
Systems of this type should not be used to locate faults on direct-buried unshielded or
secondary cable. Dangerously high differences in potential may be developed in the
current return path to the system.
Systems of this type should not be used to locate faults on any cable that is likely to be
near enough to an energized cable to allow a burn through of the insulation of the
energized cable. This situation may occur when the cables are located in a common
trench, duct, or tray.
On completion of a test, even after power has been removed from the system, energy
can still be stored in the impulse capacitor and cable under test. To discharge the cable
and capacitor, immediately after use, set the OUTPUT KILOVOLTS switch to ZERO
START. This places a solid ground on the output cable, power supply, and impulse
capacitor.
F
WARNING
Never assume that the coaxial output cable or the cable under
test is completely discharged, even after following the above
procedures. Always use a safety grounding stick to ground any
conductive part of the circuit and then apply safety ground
jumpers before touching any connections.
This system operates from a single-phase power source. It has a three-wire power cord
and a two-pole, three-terminal grounding type connector. The voltage to ground from
either pole of the power source must not exceed the maximum rated operating voltage,
120 V ac for Catalog No. 651403 and 240 V ac for Catalog No. 651404. Before making
connection to the power source, determine that the system is suitable for the voltage of
the power source, and has a suitable two-pole, three-terminal grounding type connector.
The power source must have a high rupture fuse or circuit breaker rated no higher than
15 A.
The power input plug must be inserted only into a mating receptacle with a ground
contact. Do not bypass the grounding connection. Any interruption of the grounding
connection can create an electric shock hazard. Determine that the receptacle is
correctly wired before inserting the plug.
To avoid electric shock hazard, operating personnel must not remove the system
protective covers. Component replacement and internal adjustments must be made by
qualified service personnel only.
Users of high-voltage equipment should note that high-voltage discharges and other
sources of strong electric or magnetic fields may interfere with the proper functioning
of heart pacemakers. Personnel using heart pacemakers should obtain expert advice on
the possible risks before operating this equipment or being close to the equipment
during operation.
If the system is operated in accordance with the safety precautions in this manual and if
all grounds are correctly made, rubber gloves are not necessary. As a routine safety
procedure, however, some users require that rubber gloves be worn, not only when
making connections to the high-voltage terminals, but also when manipulating controls.
Megger recommends this excellent safety practice.