[email protected] wrote: >... as we know, IEC950 amendment 4 is out for some >time. Can someone please send a note of the changes >(DELTA) it contains relative to the previous version?
Fourth amendment changes include Voltage measurement Component compliance criteria Restricted access locations Operator and service access Introduction of TNV-1, -2 and -3 circuits Extensive changes to TNV circuit criteria and testing Integration of SELV and TNV requirements Titling of all clauses Enhancement of compliance statements Changes to clearance and insulation requirements New labeling requirements Insulated winding wire criteria Improved criteria for operational insulation and fault testing Error correction and editing Many other changes to clarify interpretations, correct wording or cover new constructions. The amendment is extensive and complex. Over half the pages have been modified. So the message is, don't try to guess its impact from a list like the above. The amendment is available from IEC and from national agencies like ANSI. Get a copy and do an evaluation that meets your own needs. The modifications are margin marked. No brief description would be compelete enough to cover your needs and I can't quote the entire amendment. You need to consider the actual wording in relation to your product to assess its impact.
