Where thermal measurements must be made in a high-voltage field, use
analysis techniques or measurement techniques which do not require placing a
thermocouple in the high-voltage field.
Where thermocouples are used, place isolation devices between the
thermocouple bead and the point to be monitored to ensure safety for the
operator and equipment. Use isolation devices which do not degrade the
accuracy of thermal measurements.
Provide shields and/or bleeder resistors to prevent generation of
high-voltage by leakage-current paths through thermocouples.
Where safety of the operator or accuracy of the measurement is in question,
utilize automated equipment and discontinue operation of the high-voltage for
short periods of time to allow data collection.
When thermal-surveyed units are to be used in further testing or in
systems, ensure that all external connections to embedded thermocouples are
removed and/or permanently sealed off from external access.
Minimize the number of thermocouples placed within the high-voltage
Ensure that routing of thermocouples in the high-voltage field does not
violate the design criteria for voltage stress.