It's when a coil momentarily receives a higher voltage then its nominal rating.

In general well heads are 5 nominal ratings of wellheads 2,3,5,10 and 15 (x1000)psi working pressure.

Sheets are sold in nominal ratings, and typically 90% of particles larger than the nominal rating are caught by the sheet.

Actual output in service may slightly exceed the nominal rating.

Furthermore, if we use the industry's standard criterion, a practicable system would need to be capable of recharging at five times the plant's nominal rating.

However an eighth pair of guns was added from 1780 onwards to utilise the vacant ports, without any change in the nominal rating.

The actual work a young gentleman might be doing bore hardly any relation to his nominal rating.

This particular model boasts a special circuit to extend its nominal rating for brief periods to handle musical peaks.

Include the rotor it measures 90 metres in diameter, is 125 metres high and has a nominal rating of 2.5 Megawatts.

Eurogamer issued a nominal rating of 5 out of 10, criticising the game for being generic.