Safety Practices – General Rules
1-20 72A-1230 Rev. F
July 22, 2005
• Test Supervisor – This person is responsible for overseeing
preparations for the test sequence, overseeing M4000 Insulation
Analyzer operation, and ensuring that all safety precautions are put
into practice. Safety practices followed should include company
policies, applicable government regulations, and any special
requirements related to use of the M4000 Insulation Analyzer.
Safety Practices – General Rules
1. All tests should be performed with the apparatus under test completely
de-energized and isolated from its power systems. This means
disconnecting and grounding all bus from the apparatus under test.
2. The method of testing high voltage apparatus involves energizing the
apparatus through the M4000 Insulation Analyzer. The act of testing
apparatus, which is otherwise de-energized and isolated from its system,
can itself produce dangerous levels of voltage and current. Care must be
taken to avoid contact with the apparatus being tested, its associated
bushings and conductors, and with the M4000 Insulation Analyzer cables.
3. The test crew must make a visual check to ensure that the apparatus
terminals are isolated from the power system. Where the possibility of
failure of the apparatus under test must be considered a real possibility,
precautions (such as barriers or entrance restrictions to test area) must be
taken against harm in the event of violent failure.
4. All rules of your company for safe practice in testing must be strictly
conformed to, including all practices of tagging and isolating apparatus
during testing and maintenance work. State, local, and federal regulations,
e.g. OSHA, may also apply.
NOTE Company rules and government regulations take precedence over Doble
recommendations.
Clearances
Proper clearance between the test equipment, crew members, and the
apparatus being tested, must be observed at all times during energization.
Barriers, safety tapes, and ladder barriers should be erected around the test
area to prevent unintentional (or intentional) entry into the “live” area. These
same precautions should be taken to block unwitting entry into the area by
means of ladders, buckets, or any other extraneous equipment by which entry
into the area may be gained.
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