In the case of electric drive trains, the net power test consists of a run at the full setting of the throttle controller. Measurements must be taken at a sufficient number of motor speeds to define the power curve between zero and the highest motor speed recommended by the manufacturer. The regulation also includes a test to determine the maximum 30 minutes power (for electric drive trains only). This means the maximum net power that the electric drive train can deliver over a period of 30 minutes, as an average. During the test, the drive train is run at a power which is the best estimate of the manufacturer for the maximum 30 minutes of power. The speed must be in a range, at which the net power is greater than 90 percent of the maximum power measured in the net power test. Speed and power must be recorded and the power must be in a range of ±5 percent of the power value at the start of the test. The net power and the maximum 30 minutes power indicated by the manufacturer are accepted if they do not differ by more than ± 2 percent for maximum power and more than ± 4 percent at the other measurement points on the curve with a tolerance of ±2 percent for engine or motor speed