possibility of getting on a live circuit. To avoid this requires constant vigilance - for oneself and for
one's fellow workers.
In addition to the obvious dangers, personnel should be alert to recognize subtle dangers as well.
For example, during transformer excitation-current tests, the floating terminals may have
significant voltages induced in them by simple transformer action. Therefore, all terminals of a
device under test, unless grounded, should be considered to be live while the test is in
progress.
When potential transformers or any transformers are interconnected, voltage can be back-fed
through the secondary windings to produce high voltage on the primary although the primary is
seemingly isolated from the power system. This entail a second important rule - all terminals of
a device under test should be completely isolated.
Remember: Safety, FIRST, LAST,
ALWAYS !
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