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(2) Voltage. Overvoltages and undervoltages can be detrimental to the transformer and the load it serves. Investigate immediately and take correc­tive action to bring the voltage within acceptable limits.

(3) Temperature. Use integral unit-mounted temperature gauges and maximum temperature in­dicators, where available. Record readings, and re­set the maximum temperature indicator. Excessive temperature can indicate an overload interference with the normal means of cooling. Prolonged opera­tion at an overtemperature will accelerate liquid deterioration; result in a reduced life expectancy of the solid insulation; and may greatly increase the risk of failure. Constant monitoring against overtemperature is often provided by special alarm contacts on a transformer's temperature gauge.

(4) Liquid level. Check regularly, and espe­cially after a long low-load period with a low ambi­ent temperature, as this is when the liquid level should be at its lowest point. Liquid must be added before the level falls below the sight glass or bottom reading of the liquid-level indicator. If there is no liquid-level indicator, de-energize the transformer and check the liquid level by removing the inspec­tion plate on the top of the transformer, or by re­moving the top if no inspection plate is available.

(5) Pressure I vacuum.

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