请教大家两个安规电容问题，谢谢！

對方指的是最大耐壓305V，安規認證標示的是275V-這是額定電壓。目前Vishay有最大电源电压可310 VAC的。

小心使用

1 Capacitors used to bridge BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED
INSULATION shall be class Y except that it is permitted to bridge BASIC INSULATION in a SECONDARY
CIRCUIT by a class X capacitor.
2 The voltage rating of the capacitor shall be at least equal to the RMS WORKING VOLTAGE across the
insulation being bridged, determined according to 2.10.2.2.
3 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION or SUPPLEMENTARY
INSULATION, the peak test voltage of the capacitor shall be at least equal to the REQUIRED WITHSTAND
VOLTAGE.

4 For a single capacitor bridging DOUBLE INSULATION or REINFORCED INSULATION, the peak test voltage
of the capacitor shall be at least equal to twice the REQUIRED WITHSTAND VOLTAGE.
5 It is permitted to use a higher grade capacitor than the one specified, as follows:
- subclass Y1 if subclass Y2 is specified;
- subclass Y1 or Y2 if subclass Y4 is specified;
- subclass Y1 or Y2 if subclass X1 is specified;
- subclass X1, Y1 or Y2 if subclass X2 is specified.
6 It is permitted to use two or more capacitors in series in place of the single capacitor specified, as follows:
- subclass Y1 or Y2 if subclass Y1 is specified;
- subclass Y2 or Y4 if subclass Y2 is specified;
- subclass X1 or X2 if subclass X1 is specified.
7 If two or more capacitors are used in series, they shall
- all have the same nominal capacitance value;
- each be rated for the total RMS WORKING VOLTAGE across the insulation; and
- comply with the other rules above.

从上面看，电容至少要等于桥接的相电压，275V的肯定不行，要480V的，即便是两个电容串联，单个电容也满足480V