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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
w" N! ^+ @) M" `# G? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006$ j9 m' C* G1 h# z
Subclause Change ? Comment
8 ]& @2 [" x' q! ^7 P4 k5 w1 {Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published1 ]1 ^( Z8 X4 c/ K" k( Z, W
yet (Mar-2006).
% T5 L9 C8 H9 N* t0 z h; |5 K$ [) F6 t1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for
7 }' _% x' ]& f; e; j' e, wincorporation in ITE.
$ y E4 i+ s; g* w. z; c1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples./ p$ a. y0 n3 C/ N
1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,
! A7 Y3 X- _$ f" ]$ m; \SHORT-TIME OPERATION and INTERMITTENT OPERATION).
* B7 X/ N2 p3 T9 ?* @9 m+ V1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types& n$ q1 y! X1 P$ d$ h
A and B.4 e, q. i p4 N; L1 A# K* |
1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.
6 a. o Z' Y6 l: n8 j" s1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.
9 C% C X# o7 c4 t6 s( V+ ]5 k1.2.10.4 New 0 SOLID INSULATION introduced as defined term.
2 l, |- x9 p* p* |3 u' J, M* `; C3 h1.2.13.15 New 0 CHEESECLOTH introduced as defined term.
4 u: p0 h4 I0 B1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.4 A4 z/ G) d1 }: n. ?! j
1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to- ^& }% w" b6 @- m/ _3 Q: b
previous term "current rating of the circuit under test" of subclause 2.6.3.4.
2 B. R; F; B4 Q9 N9 u6 R D1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value5 L5 T2 p9 g A" I: U
in the rated voltage range shall be used for test.
( i; I: c, p- m8 h1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for8 o2 T$ ~+ v: m$ U
overvoltage protection of TNV circuits.2 Y4 W! z& z8 @" y. H# W
1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only' R7 S; e8 R( r+ z
simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock). |2 V( g' S3 n3 O5 ~+ A
1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting
8 p' W0 v# D3 O9 Y1 }3 n; F/ r! nsecond paragraph and old "Note 3".
& U# ?; q% x5 f7 F! r2 F9 L# f5 u! {* D1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14.8 j/ R2 ?% ^+ C8 c% B
However, application principle of X- and Y-capacitors not changed.5 v% T: l) z7 C. ]0 @
1.5.7 Complete change and concept for bridging resistors. Detailed requirements. y; Y' _7 [" M% X* p7 s
for:$ U- u' f/ b3 Z) d' K) H
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1)
, Q% w( A# n/ i2 w$ W· Resistors double/reinforced functional insulation (1.5.7.2)( D, n/ X4 S6 H/ c. e8 l4 ]7 N( J1 u
· Resistors double/reinforced functional insulation – Special2 G6 {1 _& M. ~# q2 o
requirements when connected to antenna/coaxial cable (1.5.7.3)
% ~# o& g2 C0 K1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.: n8 U. \! ^/ T' ?5 V' t
1.5.7.2 Very different concept:
) C. H, [5 ]* ^6 E· Single resistor is acceptable if it passes "Resistor test"- Y. ^+ M% R7 ]" c. C
· Group of resistors must either pass "Resistor test" or pass subclauses' n4 I* Y2 s0 n3 K
2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn
" ?3 _/ O! e9 B# X3 S"Resistor test":
/ x* T3 N) ]2 y& NDamp heat test of IEC 60068-2-78 plus impulse test and resistance8 x+ @0 Z! o. P% N! K$ t/ c
measurement.
8 ^2 n( D3 R) u" \1.5.7.3; y6 R% `5 b- n) y. Q/ k' S8 A+ F
Modified 2' x: J v+ A' k; _
Same as 1.5.7.2 above but with different impulse generator for circuits with' R6 [$ N- y" _- d3 [6 f
coaxial cable connection., H/ [& R( d8 u4 F* T$ q
1.5.9 Requirements for varistors (VDR) specified. |% P# f/ j) d1 R
1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed
& f" r8 b+ b' N: H7 _! b9 rPrimary circuit surge suppressors: only VDR allowed.
& o4 k8 [: Q4 S& @8 U1.5.9.2 An interrupting means must be provided for protection of the VDR in series.+ b7 l2 R4 p& J
1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional4 s/ i- X! G; W% ~. g
requirements.
1 T" V% R8 n1 J+ W2 \1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:
6 S8 H% q% X* m0 L1 ~· one side of the VDR must be earthed h+ I. x$ S- T8 ?
· only possible for pluggable equipment type B or permanently/ E5 u% g8 h$ Y' O4 M" Q1 R) O/ Z
connected equipment or equipment with permanently connected
: n a1 J* \$ @! d9 I Searthing conductor1 O; z' v8 F$ W; W) g
· more restrictions for countries FI, NO, SE( B6 ^: V1 d+ Y" q
1.5.9.57 l- n, o2 D* m% u
New 22 J! x8 L' ~- J: c
It is not allowed to bridge supplementary/double/reinforced insulation by
$ b& ^2 R, z2 {% ], ?9 N( Q, _2 CVDR.
9 i; u: L4 h# d3 W: c4 n" B/ z5 N1.6.1 Modified 0 "Note" for Australian national difference was deleted.
! _% J( g! j* k- A1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
6 s0 H1 i" D; Y1 `" N4 G$ E& x1.7.2 Modified 0 Re-arranging of content of subclauses 1.7.2, 1.7.10 and 1.7.16. |
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