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The standlard starting classes are 6.150.300 and 600 starts per hour , taking into account complete starting, josging or inching and electric (plug) braking operation on the following basic.

One jog (i.e. an inicomp lete start during which the motors does not reach more than 4 rated speed) is thermally equivalent h0.8 complete starting.

One plug braking operation (down to 1/3 rated speed) is thermally equivalent to 0.8 complete starting.

One complete plug reversals is approximatecy a thermal equivalent of 1.8 complete starting.

Examples of typical starting duty are shown in table 9.

表9