AVTMTTR25 Rev C April 2008
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SAFETY
Overview
The TTR25 must be used on de-energized transformers. However, the
transformer to which the test set is connected is a possible source of high-
voltage electrical energy and all persons making or assisting in tests must use all
practical safety precautions to prevent contact with potentially energized parts of
the transformer and related circuits. Persons actually engaged in the test must
stand clear of all parts of the complete high-voltage circuit, including all
connections, unless the test set is de-energized and all parts of the test circuit
are grounded. Persons not directly involved with the work must be kept away
from test activities by suitable barriers, barricades, or warnings.
Treat all terminals of high-voltage power equipment as a potential electric shock
hazard. There is always the possibility of voltages being induced at these
terminals because of proximity to energized high-voltage lines or equipment.
Always disconnect test leads from power equipment before attempting to
disconnect them at the test set. The ground connection must be the first made
and the last removed. Any interruption of the grounding connection can create an
electric shock hazard.
Any repair or component replacement must be performed by qualified service
personnel.
Safety Requirements
Megger has made formal safety reviews of the initial design and any subsequent
changes. This procedure is followed for all new products and covers areas in
addition to those included in applicable standards. Regardless of these efforts, it
is not possible to eliminate all hazards from electrical test equipment. For this
reason, every effort has been made to point out in this instruction manual the
proper procedures and precautions to be followed by the user in operating this
equipment and to mark the equipment itself with precautionary warnings where
appropriate. It is not possible to foresee every hazard that may occur in the
various applications of this equipment. It is therefore essential that the user, in
