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Old 14th April 2013, 09:07 PM   #31
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Quote:
Originally Posted by DF96 View Post
Yes, 10nF X cap will be much safer. In the 1960s people just used high voltage DC-rated caps, but that is all they had. If one of those shorts you get a big bang and hopefully a fuse or breaker will prevent a fire developing. X caps should not do that as they are designed to cope with over-voltage transients.
I just can't find any X-over (X1 or X2) ceramic caps in Europe.
Also fail to source any 1000 Volts 0.01 uF (10000 pF) ceramic discs.

This is the best I can find:
http://www.mouser.com/ds/2/427/440l-239711.pdf
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Old 14th April 2013, 09:16 PM   #32
DF96 is offline DF96  England
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X caps should be in any decent European electronics catalogue. They are not usually ceramic, but plastic film. I suspect that ceramic X caps are more popular elsewhere.
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Old 15th April 2013, 01:04 AM   #33
JMFahey is offline JMFahey  Argentina
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Quote:
These are used for surpressing the transient at turnoff wich the do very well I must say. I do not use them for spikes or overvoltage
The turnoff transient *is* a spike, and overvoltage, many times higher than line voltage.
Your caps are working ... until they explode and make a mess.
Anyway, "X" and "Y" capacitors *must* be available in Europe .... after all they are mandatory to get any certification, whether CE, SEMKO, TV, or any other.
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Old 15th April 2013, 01:26 AM   #34
JMFahey is offline JMFahey  Argentina
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Quote:
These are used for surpressing the transient at turnoff wich the do very well I must say. I do not use them for spikes or overvoltage
The turnoff transient *is* a spike, and overvoltage, many times higher than line voltage.
Your caps are working ... until they explode and make a mess.
Anyway, "X" and "Y" capacitors *must* be available in Europe .... after all they are mandatory to get any certification, whether CE, SEMKO, TV, or any other.

EDIT: Excuse me for having searched in Farnell Belgium, I speak French but not Dutch, I'm sure the same is available in Netherlands:
Zoekresultaten | Farnell Belgi
You have some 200 X2 rated capacitor types, suitable for your task.
Good luck.
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Old 15th April 2013, 07:55 PM   #35
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Hi Guys,

Just bought four Vishay Class Y1 440LS10-R AC Line Rated Disc Capacitor
Class Y1, 500 VAC.
According to the datasheet it's:
Component test:
4000 VAC, 50 Hz, 2 s
As repeated test admissible only once with:
3600 VAC, 50 Hz, 2 s
Random sampling test (destructive test):
4000 VAC, 50 Hz, 60 s

Should be enough I reckon.

Thanks for your advise, warnings and input in this matter
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Old 15th April 2013, 10:53 PM   #36
JMFahey is offline JMFahey  Argentina
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Well, *now* you know how pitifully inadequate were those old 500V (DC) caps .
These claim "tested at 4000VAC" which implies over 5600V peaks.
That cap could be easily rated 3000V DC with a wide safety margin.
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