Nick, The following is information obtained from the Ceramite capacitor catalog.
Class X capacitors are used between Line and Neutral. Class Y capacitors are used between Line or Neutral and Ground. IEC 384-14 Subclass Y Capacitors: * A capacitor of a type suitable for use in situations where failure of the capacitor could lead to danger of electric shock. * Class Y capacitors are divided into sub-classes based on type of insulation bridged and voltage ranges, * Subclass Y capacitors may be used in applications which require a Subclass X rating. Y1 Voltage=250 VAC Type of insulation bridged=Double or Reinforced Peak Impulse Voltage Before Endurance Test=8 kV Y2 Voltage=250 VAC Type of insulation bridged=Basic or Supplementary Peak Impulse Voltage Before Endurance Test=5 kV Y4 Voltage=125 VAC Type of insulation bridged=Double or Reinforced Peak Impulse Voltage Before Endurance Test=2.5 kV IEC 384-14 Subclass X Capacitors: * A capacitor of a type suitable for use in situations where failure of the capacitor would not lead to danger of electric shock. * Class X capacitors are divided into sub-classes according to the peak voltage of the impulses superimposed on the main voltage to which they may be subjected to in service. X1 Voltage=400 VAC Peak Impulse Voltage in Service=2.5 to 4.0 kV Application=High Pulse X2 Voltage=400 VAC Peak Impulse Voltage in Service=Up to 2.5 kV Application=General Purpose Hope this helps. If you need more information Ceramite's phone number is 414-377-3500 and their web site is www.ceramite.com. I'm sure they would be more than happy to answer any additional questions. Best regards, Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567 Enterprise Dr. Westerville, OH 43081 Ph. 614-846-6175 Fax 614-846-7791 Email: [email protected] -----Original Message----- From: Nick Williams [SMTP:[email protected]] Sent: Wednesday, September 08, 1999 5:12 AM To: [email protected] Subject: Suppression capacitors I'd appreciate it if someone could confirm (and/or add to) the following, which is my understanding of the application of the various classes of supression capacitor: X2 - suitable for applications where the supply is connected directly across the capacitor but the appliance is not permanently connected; X1 - Suitable for applications where the supply is connected directly across the capacitor and the appliance is permanently connected; Y - Suitable for applications where the capacitor is connected directly between the supply and accessible conductive parts. These definitions are based on Clause 14.2 of EN60065 but any references to other standards which apply would also be useful. Thanks Nick. --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
