This is a multi-part message in MIME format.
Equipment shall be so designed that the risk of fire or electric shock due to mechanical or electrical overload or failure, or due to abnormal operation or careless use, is limited as far as practicable. After abnormal operation or a single fault, the equipment shall remain safe for an OPERATOR, but it is not required that the equipment should still be in full working order. Compliance is checked by inspection and by tests.
John Radomski
Ilan Cohen
<[email protected]> To:
"'[email protected]'" <[email protected]>,
Sent by:
[email protected]
owner-emc-pstc@majordo cc:
mo.ieee.org Subject: RE: Safety of
Schuko CEE7 plug (earthed plug) in Europe?
10/29/2003 12:23 PM
Please respond to Ilan
Cohen
(Embedded image moved to file: pic00292.gif)
(Embedded image moved to file: pic12382.gif)Take for example a power supply
with a transformer and a few components in the path (Inlet, filters...)
protected by a fuse of about 3A. Building installation is typically 10A
minimum. You may end with faults from Line to Ground that will stress the
components at more than %300 of their rating. This is a safety risk were
the transformer insulation may fail or a fire can break in the line
filter..... (See attached drawing)
Ilan Cohen
Technical Director, Safety & Telecom Divisions
I.T.L (PRODUCT TESTING) Ltd.
26 Hacharoshet St, POB 211, Or Yehuda, Israel.
Tel 972-3-5339022, Fax 972-3-5339019
[email protected], website: http://www.itl.co.il
I-SPEC: The best place on the internet to learn about safety !!
http://www.i-spec.com/
(I-Spec is provided free of charge as a service by ITL to the compliance
community)
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, October 29, 2003 5:26 PM
To: [email protected]
Subject: RE: Safety of Schuko CEE7 plug (earthed plug) in Europe?
Ilan, EN60950 requires both overload and earth fault protection.
Pluggable products may rely upon the building protection (mains
fuses, breakers) to provide line to earth fault protection. If so, a
single internal fuse or breaker can protect against overload. Such
construction is allowed and is considerd to be safe even if the mains
plug is not polarized.
Richard Woods
Sensormatic Electronics
Tyco International
-----Original Message-----
From: Ilan Cohen [mailto:[email protected]]
Sent: Wednesday, October 29, 2003 8:57 AM
To: '[email protected]'
Subject: Safety of Schuko CEE7 plug (earthed plug) in Europe?
Dear Group
I have been looking into the usage of the Continental European
Plug also known as Schuko CEE7 plug (earthed plug). It can be
inserted into the Wall socket without a way to ensure that line
is connected to line and Neutral to Neutral.
http://www.interpower.com/s
ripts/wsisa.dll/WService=panel-icl/p80list2.p?w_country=Continental+Europe
It presents a technical problem with products, which are
protected by one fuse.
Typically a fuse is installed in the Line in any product. To be
really safe there should be two fusses, one in the line and
another in the neutral.
Does anyone know the actual regulations in Germany or other
countries that started adopting these plugs regarding the
number of fusses in the product?
There is clearly a safety problem here, which is not being
handled properly by safety standards like EN60950 (ITE) or
EN60335 (Home appliances). But in the other hand it will be an
overkill to request two fusses for products entering the EU
(Germany, Italy...)
----------------------------------------------------------
Ilan Cohen
Technical Director, Safety & Telecom Divisions
I.T.L (PRODUCT TESTING) Ltd.
26 Hacharoshet St, POB 211, Or Yehuda, Israel.
Tel 972-3-5339022, Fax 972-3-5339019
[email protected], website: http://www.itl.co.il
------------------------------------------------------------
---------------------------
I-SPEC: The best place on the internet to learn about safety !!
http://www.i-spec.com/
(I-Spec is provided free of charge as a service by ITL to the
compliance community)
---------------------------
(See attached file: clip_image001.gif)
Title: RE: Safety of Schuko CEE7 plug (earthed plug) in Europe?
Equipment shall be so designed that the risk of fire or electric shock due
to mechanical or electrical overload or failure, or due to abnormal
operation or careless use, is limited as far as practicable. After abnormal
operation or a single fault, the equipment shall remain safe for an
OPERATOR, but it is not required that the equipment should still be in full
working order. Compliance is checked by inspection and by tests.
John Radomski
Ilan Cohen
<[email protected]> To: "'[email protected]'" <[email protected]>,
Sent by: [email protected]
owner-emc-pstc@majordo cc:
mo.ieee.org Subject: RE: Safety of Schuko CEE7 plug (earthed plug) in Europe?
10/29/2003 12:23 PM
Please respond to Ilan
Cohen
(Embedded image moved to file: pic00292.gif)
(Embedded image moved to file: pic12382.gif)Take for example a power supply
with a transformer and a few components in the path (Inlet, filters...)
protected by a fuse of about 3A. Building installation is typically 10A
minimum. You may end with faults from Line to Ground that will stress the
components at more than %300 of their rating. This is a safety risk were
the transformer insulation may fail or a fire can break in the line
filter..... (See attached drawing)
----------------------------------------------------------
Ilan Cohen
Technical Director, Safety & Telecom Divisions
I.T.L (PRODUCT TESTING) Ltd.
26 Hacharoshet St, POB 211, Or Yehuda, Israel.
Tel 972-3-5339022, Fax 972-3-5339019
[email protected], website: http://www.itl.co.il
------------------------------------------------------------
--------------------------------------------------------------------------------------------------------
I-SPEC: The best place on the internet to learn about safety !!
(I-Spec is provided free of charge as a service by ITL to the compliance
community)
---------------------------------------------------------------------------------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, October 29, 2003 5:26 PM
To: [email protected]
Subject: RE: Safety of Schuko CEE7 plug (earthed plug) in Europe?
Ilan, EN60950 requires both overload and earth fault protection.
Pluggable products may rely upon the building protection (mains
fuses, breakers) to provide line to earth fault protection. If so, a
single internal fuse or breaker can protect against overload. Such
construction is allowed and is considerd to be safe even if the mains
plug is not polarized.
Richard Woods
Sensormatic Electronics
Tyco International
-----Original Message-----
From: Ilan Cohen [mailto:[email protected]]
Sent: Wednesday, October 29, 2003 8:57 AM
To: '[email protected]'
Subject: Safety of Schuko CEE7 plug (earthed plug) in Europe?
Dear Group
I have been looking into the usage of the Continental European
Plug also known as Schuko CEE7 plug (earthed plug). It can be
inserted into the Wall socket without a way to ensure that line
is connected to line and Neutral to Neutral.
It presents a technical problem with products, which are
protected by one fuse.
Typically a fuse is installed in the Line in any product. To be
really safe there should be two fusses, one in the line and
another in the neutral.
Does anyone know the actual regulations in Germany or other
countries that started adopting these plugs regarding the
number of fusses in the product?
There is clearly a safety problem here, which is not being
handled properly by safety standards like EN60950 (ITE) or
EN60335 (Home appliances). But in the other hand it will be an
overkill to request two fusses for products entering the EU
(Germany, Italy...)
----------------------------------------------------------
Ilan Cohen
Technical Director, Safety & Telecom Divisions
I.T.L (PRODUCT TESTING) Ltd.
26 Hacharoshet St, POB 211, Or Yehuda, Israel.
Tel 972-3-5339022, Fax 972-3-5339019
[email protected], website: http://www.itl.co.il
------------------------------------------------------------
--------------------------------------------------------------------------------------------------------
I-SPEC: The best place on the internet to learn about safety !!
http://www.i-spec.com/
(I-Spec is provided free of charge as a service by ITL to the
compliance community)
---------------------------------------------------------------------------------------------------------
(See attached file: clip_image001.gif)
<<attachment: pic00292.gif>>
<<attachment: pic12382.gif>>
<<attachment: clip_image001.gif>>
