Hi Duncan,
I have the following information, I think I got it from my local KTL lab:
EN60950:1992 VS EN60950:2000
Updated Safety Requirements for IT Telecoms Equipment Under the Low
Voltage Directive
EN 60950:2000 was implemented at a national level on 1st January 2001,
replacing EN 60950 : 1992 including amendments:
1,2,3,4 and 11, which will be withdrawn in due course. EN 60950:2000 is a
harmonised standard under the Low Voltage Directive and as such compliance
with it provides a presumption of conformity with the essential requirements
of the Directive. The European Commission publishes dates for cessation of
the presumption of conformity, as shown below:
Amendment (A1) EN 60950 : 1992 1st March 2000 (Expired)
Amendment (A2) Amendment (A1) 1st March 2000 (Expired)
Amendment (A3) Amendment (A2) 1st January 2002
Amendment (A4) Amendment (A3) 1st August 2003
Amendment (A11) Amendment (A4) 1st August 2003
EN 60950 : 2000 Amendment (A11) 1st January 2005
What are the main differences between EN 60950 : 2000 and EN 60950 : 1992
inc amendments ?
The most obvious change in the new standard relates to the clause numbering,
which has been dramatically re-organised, but there are also a number of
amendments and additional requirements as follows:
Batteries
There is a requirement to consider, and in some cases test, any battery
installed in the equipment, (not just lithium batteries as previous). Also
manufacturers of equipment powered solely from an internal power source can
now use the relaxation under clause 4.4.5.2 covering the need for a fire
enclosure.
Protective Earthing / Bonding
Methods of determining the resistance of earthing conductors and their
minimum cross sectional areas have been added or modified. Also tests have
been made more onerous for the testing of earth conductors within equipment
rated in excess of 16A, and earth bonding conductors must be separated from
protective earthing conducters.
Opto-Isolators
Tests are now specified under clause 2.10.5.1. Also the distance through the
insulation for supplementary and reinforced insulation is relaxed under
certain circumstances.
Alternative Method for Determining Clearance
Annex G provides an alternative method of determining clearance.
Mains Cords
The minimum designation for detachable mains cords is now the same for
equipment with a mass up to 3kg, irrespective of the total mass. Also the
cross sectional area of mains cords table has been expanded to include
higher currents.
Wiring Terminals
Included in clause 3.3.6 are a number of constructional requirements for the
terminal supplied for the connection of permanently connected equipment or
equipment with ordinary non-detachable power cords.
10N, Steady Force Test
A new test has been added requiring components and parts to be subjected to
a 10N force.
Wall Ceiling Mounted Equipment
A force equal to 3 times the mass of the equipment or 50N (whichever is
greater) is now applied when the equipment is mounted on the wall or
ceiling, to ensure it does not become unstable.
Openings in Transportable Equipment
New requirements have been added addressing problems of foreign objects
entering equipment, e.g. lap top computers, from any orientation and being
subject to movement within the enclosure.
Leakage Currents to from the Networks The standard addresses leakage
currents to and from the telecommunications networks and also considers
hazards which may arise as a result of leakage to or from multiple network
connections.
Flammability
A number of alternative methods of determining flammability have been added,
including the Glow Wire Test for components and parts located outside fire
enclosures.
Kind Regards
Alex McNeil
Principal Engineer
Tel: +44 (0)131 479 8375
Fax: +44 (0)131 479 8321
email: alex.mcn...@ingenicofortronic.com
-Original Message-
From: duncan.ho...@snellwilcox.com [mailto:duncan.ho...@snellwilcox.com]
Sent: Tuesday, March 26, 2002 8:45 AM
To: emc-p...@majordomo.ieee.org
Subject: EN60950:1992 vs EN60950:2000
Group,
Does anyone have a list of all the differences between EN60950:1992 and
EN60950:2000? If so may I have a copy.
Many thanks in advance
Duncan Hobbs.
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