• Isolate the core and coils of the transformer from the ground. In air cooled dry types this means to isolate the core and coil from its support on the ground. For an oil filled unit it means to isolate the core and coil from its tank base, and isolate its tank base from the supporting ground.
• Use isolating materials guaranteed to eliminate transformer frequencies (at 120 cps upwards). This is important. Not many materials can do this. Seek advice on the best anti-vibration pads to use.
• Make sure all connections to a solid reflecting surface are flexible. This includes incoming cables, bus bars, stand off insulators, etc. Any solid connection from the vibrating transformer to a solid structure will transmit vibration.
• Make sure shipping bolts are removed so that they do not short circuit anti-vibration pads.
• Additional information is given in ANSI C57.94, Section 4.10.
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