What were called X and Y capacitors are now more accurately called X2 and "y2 capacitors" respectively.


From the perspective of protection rules (like impulse ion score etc.), both the X1 and Y1 are virtually considered equivalent to two x-2 and "y2 capacitors" in series respectively. For example Y1 caps have been impulse analyzed to 8kV. The first conditions'X-caps' and'Y-caps' have recently started becoming entangled to refer to this more uncommonly used (increased voltage) x 1 and Y1 capacitors instead.X2 and "y2 capacitors" are the absolute most widely used and are generally found in appliances which plug into common 120- volt receptacles.
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Even the capacitors utilised in powerline filters needs to meet stringent standards. They are wired right between the energized conductors (X capacitors) or between the energized conductors and ground (Y capacitors). In addition, they are constantly under line voltage with no additional protection. Standard equipment criteria like IEC 60950 (IT products ) call for that capacitors involving a phase conductor and the neutral conductor be at least Class X2, and also capacitors among phases/neutral and also the ground stride beat least Class Y2.




The capacitors fit for such use comprise high-voltage "y2 capacitors" (surface-mount apparatus [SMD] or leaded with ideal creepage/clearance degrees ) commonly utilized in electricity supplies. Using "y2 capacitors" to the printed circuit board (PCB) presents direct inductances on either side of the capacitor -- combined with its very own parasitic inductance -- which makes the capacitor unsuccessful at frequencies higher than 200MHz. 1 surefire way to create a low-inductance capacitance would be by Over-Lapping internal PCB layers.Because most software require one particular X and 2 Y capacitors, multi-capacitor devices are readily available. Additionally readily available are many different plastic or metal housing fashions, mounting options (pc mount, pig-tail ) and 4-wire connections. At least 1 manufacturer (WIMA) has x 2 and also "y2 capacitors" at SMD, with more expected to follow along. Line-filter capacitors are most often boxed and potted in epoxy.