10 Jun
2011
10 Jun
'11
4:40 p.m.
Sorry, this is OT regarding to Linux, but not for audio in general and
perhaps it could protect some people from the list against a popular
misconception about lightning protection.
Does somebody know how (in)effectively overvoltage protections for wall
sockets in pre-WWII residential buildings are? I suspect that were I
live, will be no pre-protections. It seems to be that a concrete-footing
ground electrode and ground fault interrupter were the only things that
were retrofitted and btw. I'm even not sure if the concrete-footing
ground electrode isn't just a fake.
AFAIK know consumer wall socket overvoltage protections are completely
useless, when living in a pre-WWII residential building.
Does anybody know if there's a way to protect equipment against damages
by lightning when there are no pre-protections?
Regards,
Ralf
10 Jun
10 Jun
4:57 p.m.
New subject: OT: Overvoltage protection aginst lightning for audio studios
On 06/10/2011 04:39 PM, Ralf Mardorf wrote:
Does anybody know if there's a way to protect
equipment against damages
by lightning when there are no pre-protections?
With the band we use a Furman power conditioner:
http://www.furmansound.com/product.php?div=03&id=M-10xE
Not sure though how it holds when lightning strikes though, never tested
it ;)
Best,
Jeremy
5:30 p.m.
New subject: OT: Overvoltage protection aginst lightning for audio studios
On 06/10/2011 04:39 PM, Ralf Mardorf wrote:
An over-voltage safety connector should do it, I think.
Unless the lightning directly hits your equipment, what a lightning
arrester is meant to prevent.
According to the spec. this connector can handle 90 000 Ampere ! :
http://www.conrad.de/ce/de/product/612407/PROFI-UeBERSPANNUNGSSCHUTZ-BELKIN…
some more:
http://www.conrad.de/ce/de/FastSearch.html?search=blitz+schutz&initial=…
--
E.R.
Does anybody know if there's a way to protect
equipment against damages
by lightning when there are no pre-protections?
5:54 p.m.
On Fri, 2011-06-10 at 17:30 +0200, Emanuel Rumpf wrote:
This is similar to what I'm using now and I called 'supermarket' device,
hm? And perhaps like the Furman device too, I don't know if there's a
difference.
IIUC houses that were build after the second world war should be
pre-protected, but houses that are older could be without any
pre-protection. The later a house was build, the better the
pre-protection and without pre-protection as far as I understand, those
devices are completely useless.
I don't have enough serious sources, the best seems to be the German
Wiki referring to DIN VDE.
'Perhaps' next week or so, I'll do some more research.
Thank you,
Ralf
On 06/10/2011
04:39 PM, Ralf Mardorf wrote:
An over-voltage safety connector should do it, I think.
Unless the lightning directly hits your equipment, what a lightning
arrester is meant to prevent.
According to the spec. this connector can handle 90 000 Ampere ! :
http://www.conrad.de/ce/de/product/612407/PROFI-UeBERSPANNUNGSSCHUTZ-BELKIN…
some more:
http://www.conrad.de/ce/de/FastSearch.html?search=blitz+schutz&initial=…
Does anybody know if there's a way to protect
equipment against damages
by lightning when there are no pre-protections?
7:26 p.m.
New subject: OT: Overvoltage protection aginst lightning for audio studios
2011/6/10 Ralf Mardorf <ralf.mardorf(a)alice-dsl.net>et>:
IIUC houses that were build after the second world war should be
pre-protected, but houses that are older could be without any
pre-protection. The later a house was build, the better the
pre-protection and without pre-protection as far as I understand, those
devices are completely useless.
How do the safety connectors work ?
AFAICT they separate the equipment from the over-voltage source.
Supposing this happens fast enough and the separation is high-voltage save,
how should an over-voltage still be able to harm your equipment ?
I would conclude: It can't.
'Perhaps' next week or so, I'll do some more research.
Let's know, if you figure out.
--
E.R.
7:50 p.m.
On Fri, 2011-06-10 at 19:26 +0200, Emanuel Rumpf wrote:
2011/6/10 Ralf Mardorf
<ralf.mardorf(a)alice-dsl.net>et>:
For all German readers:
http://de.wikipedia.org/wiki/%C3%9Cberspannungsschutz
For English readers:
One major issue is that those protections simply discharge against the
protective earthing conductor. An overvoltage caused by a lightning
comes with high voltage and a very quick pulse. I guess this at first is
relevant regarding to the issue, I guess strength of electric current
isn't that relevant. The discharging might not be able to really
discharge.
The web page that gives information currently isn't available:
http://www.dke.de/de/Service/Installationstechnik/Seiten/Errichtungsnormenf…
Again, I don't have knowledge, but it seems to be a mojo does protect as
good as a 'usual' lightning protection does.
Regards,
Ralf
IIUC houses that were build after the second world war should be
pre-protected, but houses that are older could be without any
pre-protection. The later a house was build, the better the
pre-protection and without pre-protection as far as I understand, those
devices are completely useless.
How do the safety connectors work ?
AFAICT they separate the equipment from the over-voltage source.
Supposing this happens fast enough and the separation is high-voltage save,
how should an over-voltage still be able to harm your equipment ?
I would conclude: It can't.
'Perhaps' next week or so, I'll do some more research.
Let's know, if you figure out.
5:41 p.m.
On Fri, 2011-06-10 at 16:57 +0200, Jeremy Jongepier wrote:
On 06/10/2011 04:39 PM, Ralf Mardorf wrote:
DIN VDE
First of three stages for the end-user
residual voltage max. 4000 V
50/100 kA
10/350 µs
Second stage
residual voltage 600 bis 2000 V
Last stage
Consumer wall socket protection is helpful, but even when there are
stage one and two, they don't protect good.
So supermarket gear is more or less useless and completely useless,
without stage one and two.
The device of your link seems to be a professional, good protection,
when there are stage one and two, before your device is connected.
IIUC without pre-protection even a professional device for the third
stage is useless.
This is my understanding, no knowledge.
Regards,
Ralf
Does anybody know if there's a way to protect
equipment against damages
by lightning when there are no pre-protections?
With the band we use a Furman power conditioner:
http://www.furmansound.com/product.php?div=03&id=M-10xE
Not sure though how it holds when lightning strikes though, never tested
it ;)
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6 comments
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participants (3)
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Emanuel Rumpf -
Jeremy Jongepier -
Ralf Mardorf