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《农村低压电力技术规程》（ＤＬ４９９－９２）２．８条规定：连接组别为Ｙ，ｙｎｏ的配电变压器，三相负荷应尽量平衡，不得仅用一相或两相供电。中性线或保护中性线的电流不应超过低压侧额定电流的 ２５％． ２．１７．４条规定：中性线不得装设熔断器或单独的开关装置。《?
Section 2.8 of Technical Specification for Rural Low-Voltage Electricity (DL499-92) states: For distribution transformer with connection group Y and yno, the three-phase load should be balanced as far as possible, and it is forbidden to use only one or two phase power supply. Neutral or neutral current should not exceed 25% of the rated current on the low side. 2.17.4 states: Neutral shall not be equipped with fuses or separate switching device. "?