M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 1-21
July 22, 2005
Grounding
1. The apparatus under test, its tank or housing, and the M4000 Insulation
Analyzer must be solidly and commonly grounded or earthed. This also
applies to any mobile equipment being tested.
2. When the M4000 Insulation Analyzer is permanently housed in a vehicle,
the M4000 Insulation Analyzer ground should be bounded to the vehicle
chassis, which in turn is grounded.
3. Exposed terminals of apparatus should not normally be allowed to “float”.
They should be grounded directly or through the low voltage leads of the
M4000 Insulation Analyzer, unless otherwise specified by Doble
recommended test plans.
4. There must be two inches of clearance between conductors (such as bus)
that are not part of the tests.
Personnel Safety
1. A pretest tailgate meeting is recommended. Frequently, other crews will
be working on non-test related tasks in close proximity to equipment being
tested. The tailgate meeting should include all personnel who will be
working in proximity to the area where testing will be performed. In this
meeting, the tests to be performed, the apparatus and the voltage test levels
involved, potential hazards involved with the work, and the individual
assignments should all be reviewed with the crew members. Test
personnel need to remain aware of the work activity taking place around
them and alert to the possibility that non-test personnel may enter the test
area.
2. A consistent and uniform set of signals, both visual and verbal, should be
agreed upon, and should be followed by all of the crew members during
testing.
3. While making the various types of connections involved in the different
tests, it may be necessary for personnel to climb up on the apparatus, but
no one should remain on the apparatus during the test itself.
4. The HV Test Cable should not be held during energization of the M4000
Insulation Analyzer. Flashover of the test specimen or the M4000
Insulation Analyzer can generate transient voltages of sufficient
magnitude to puncture the insulating jacket of the cable.
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