The main purpose of this standard is to define a series of transformer impulse withstand voltage ratings that are higher than those of IEEE Std 802.3(TM) [B6] with the intent to improve transformer insulation performance in uncontrolled environments. In the interests of International standardization the voltage values used are harmonized with the series defined in IEC 60664-1[B7] for low-voltage equipment insulation coordination. This IEEE standard is applicable to home networking installations, which are typically uncontrolled environments, where the surge voltage levels and the corresponding required transformer impulse withstand voltages can be higher than the LAN A controlled environment as defined by IEEE Std 802.3(TM) [B6].Add one new clause 4.5 Saturated core secondary winding parameters This clause describes test circuits and measurement techniques to determine the secondary peak current, the saturated secondary winding inductance and winding resistance.
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