EMI suppression capacitors, as the name implies, are used to reduce electromagnetic interfer-ence. They are connected directly to line and are therefore exposed to overvoltages and tran-sients, which could damage the capacitors. For this reason, EMI suppression capacitors must comply with the requirements of the following safety standards:
The reference European standard EN 132400:1995 is identical to IEC 60384-14:2013, 2nd edition. There is no specific UL standard for EMI capacitors above these ratings. The UL 1283:2005 stan-dard must be applied for UL compliance of EMI capacitors, even though it is a general standard for EMI filters. +85 °C, operating voltage > 250 V AC.
EPCOS recommends that if repetition of the voltage proof test is made by the customer, the ap-plied voltage should not be greater than 66% of the test voltage specified in this table. Depending on how they are connected, X and Y capacitors are effective against different kinds of electromagnetic interference.
Capacitors are applied the rated voltage at 50 Hz with 20 superimposed pulses of 2.5 kV for class X2 and 5 kV for class Y2. The rated voltage is maintained for 2 min. after the last discharge. This is a destructive test, and the failure condition is that cheesecloth around the capacitor shall not burn with a flame.
The rated voltage is maintained for 2 min. after the last discharge. This is a destructive test, and the failure condition is that cheesecloth around the capacitor shall not burn with a flame. No elec-trical measurements are required.
7273-6:2019Code of Practice for the Operation of Fire Protection Measures. Fire De na ce of Fire Detection and Fire Alarm Systems100 al ations (IET Wiring Regulations) – 18 n Site Guide3. Fixed Gase us Fire Suppression System BS EN 15004-1:2019Fixed firef xtinguishing systems. Desig , Installation & Maintenan
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