PSNet
re: V Boersma's question of wot happens above and below the rated
voltage
under the LVD and/or IEC 950...
Let's start with 'rated voltage'... IEC 950 definition - RATED VOLTAGE:
The primary power voltage as declared by the manufacturer. This is in alignment
with the IEV(ocabulary) definition.
The LVD applies to ... equipment designed for use with a voltage rating
of between 50 and 1000v for AC and between 75 and 1500v for DC ...
IEC 950 is applicable to IT Equipment with a Rated Voltage not exceeding
600v... (Notice that there is no lower voltage limit here which is different
than the LVD).
Since the LVD invokes the use of standards to demonstrate compliance,
ITE
products will use the technical requirements of IEC 950 for creepage, clearance
and insulation requirements to comply. IEC 950 has detailed requirements for
internal voltages up to 30kV (which was considered adequate for most IT
Equipment at the that time). Outside this voltage, the work of IEC 664 on
Creepage and Clearances must be considered.
So, any IT Equipment that operates from a voltage up to 1000vAC/1500vDC
must meet the requirements of IEC 950.
Even tho equipment operated from voltages below 50vAC/75vDC doesn't come
under the LVD, it does come under the General Product Safety Directive
(92/59/EEC) and must be a safe product = any product which under normal or
reasonably foreseeable conditions of use,does not present any risk or minimum
risks compatible with the product's use. So the problem becomes one of showing
conformance to the requirements. Although this GPS Directive has not been
integrated into the EU New Approach scheme (there is no provision for CE marking
or MDoC), we continue to recommend that manufacturers list this Directive on
their MDoC along with IEC/EN 950 (or other appropriate EN) to show conformance
to the requirements.
:>) br, Pete Perkins
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Peter E Perkins
Principal product safety consultant
Tigard, ORe 97281-3427
+1/503/452-1201 fone/fax
p.perk...@ieee.org
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