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G8TZJ > INFO 05.07.02 20:56l 43 Lines 1953 Bytes #999 (0) @ WW
BID : 2981_G8TZJ
Read: DB0FHN GUEST
Subj: Re: 110/240V ELCB's
Path: DB0FHN<DB0ZWI<DB0CHZ<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<7M3TJZ<ON0AR<GB7FCR<
GB7FYL
Sent: 020630/1328Z @:GB7FYL.#16.GBR.EU #:10096 [Fylde Coast AX] $:2981_G8TZJ
From: G8TZJ@GB7FYL.#16.GBR.EU
To : INFO@WWW
G8TZJ/TPK 1.82 Msg #:2981 Date:30-06-02 Time:12:57Z
ZL1UIC@ZL1UX.#20.NZL.OC wrote;
> Incidentally, the latest reg's have the ELCB protection issue; this
>has caused quite a talking point with one or 2 of the clubmembers who have
>Electrician certification. It appears that the limit for these devices is
>30 mA, but it has been proved that approx 23 mA is a lethal dose. So why
>was it upped to the higher level for the protection equipment.?
I have an ELCB feeding the sockets on my workbench and quite often when I
switch the ELCB on it will trip. It takes 2 or 3 attempts to make it stay
on. I think this is due to the leakage of the many devices that I have
plugged in. Many electrical devices have filters on the mains inputs before
the on-off switch to prevent rfi getting in / out. These comprise inductors
and capacitors and the capacitors will leak some of the current to earth.
If there are a few of these appliances with filtering on the same ELCB,
then it could add up to quite a bit of current. A sensitive ELCB could trip
quite often leading to complaints. That could be the reason for the 30mA
trip level.
Whilst on the subject of these filters here's something you might like to
try...... or maybe NOT!
Disconnect all the leads from your video recorder except for the mains lead
which will most likely be a 2 core cable. Get hold of one of the input or
output sockets with one hand (so that you are connected to the "earth" of
the video recorder) and with the other hand touch the earth pin on a mains
socket. OUCH! That shock you just got is due to the leakage of these
capacitors!
To do the above SAFELY, instead of using your hands, plug a lead into an
input or output socket and touch the screen of other end of the lead
carefully onto a mains earth. In a darkened room you will see a SPARK!
73 Andrew G8TZJ @ GB7FYL.#16.GBR.EU
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