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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
5 I) C) l" z# n3 [3 h: v( V? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006
' D6 ~1 \% |8 m& i- N: O& X: B3 V( ^4 mSubclause Change ? Comment
: \8 R% B5 \$ O+ ^Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published @$ i! }: J9 G/ y' r
yet (Mar-2006).
+ B$ k( t' J4 V# g$ k1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for
+ p+ y9 ~8 }% p2 tincorporation in ITE.
4 ^# @$ l0 A& W% o1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples.$ L+ H( X5 Z0 t: e/ p
1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,& O3 g& h1 f' r4 v2 `
SHORT-TIME OPERATION and INTERMITTENT OPERATION).0 @5 v9 U2 i3 s0 ?$ i7 T
1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types
- j9 ?* b( l# L1 j* r9 M9 J! BA and B.% w9 i6 j* h8 s
1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.& E8 ]5 H* K: z- g* \5 J
1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.
1 R8 O: s* O5 k# a2 I" Q7 d1.2.10.4 New 0 SOLID INSULATION introduced as defined term.
' w$ F; n1 [% q _/ B9 q# z: H! @1.2.13.15 New 0 CHEESECLOTH introduced as defined term.6 }$ T! |7 ?6 i
1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.8 a( j( r& P! Y4 u& `
1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to
, a: c( v" ~+ v. X' Mprevious term "current rating of the circuit under test" of subclause 2.6.3.4.# {2 [0 `. R: v9 @$ V
1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value
4 W q1 R. H# D! u3 Nin the rated voltage range shall be used for test.2 I' F) y" A, b0 i3 X
1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for Q4 c; E: C: e/ E5 `! B# g$ V
overvoltage protection of TNV circuits.
: u1 c1 I' T* }8 {! d$ Y1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only" f1 ~. P$ W+ I7 S7 k: P- f
simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).: s: q/ p$ p4 B/ Q3 S: W6 z4 G
1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting$ ~! Y% ~/ B0 V' B
second paragraph and old "Note 3".* M& d! g8 o0 c3 L9 R
1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14.2 ^8 l/ R$ C$ t5 S
However, application principle of X- and Y-capacitors not changed.! h& j$ v! v7 m/ x7 @. ]" Y' \
1.5.7 Complete change and concept for bridging resistors. Detailed requirements. G7 ~' j* V2 G% D
for:% i' y# j% C' x& e: H$ u
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1)3 }8 |. n; y* ~9 J: u9 H
· Resistors double/reinforced functional insulation (1.5.7.2)
# E! ?$ S6 R3 D· Resistors double/reinforced functional insulation – Special) Y- F% @+ H7 ?# s' E* p
requirements when connected to antenna/coaxial cable (1.5.7.3)+ W0 u% f; H4 X- D. ?1 Y
1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.
1 y8 z8 w9 i, \' R. J3 j1.5.7.2 Very different concept:
8 s4 ]# G5 y" q% n* a2 w· Single resistor is acceptable if it passes "Resistor test"5 a" V+ f# X# u. l4 W- V$ q
· Group of resistors must either pass "Resistor test" or pass subclauses
! h6 B2 l. o$ ]0 j5 \2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn
1 ^. A. M' o2 ?) V5 k f5 w, t"Resistor test":
6 P5 R+ F' A1 TDamp heat test of IEC 60068-2-78 plus impulse test and resistance0 B' a @- h- i Z
measurement.
& r3 Q& o/ X x: C9 r* T1.5.7.3
% o" m& Y0 A" sModified 2 l% v# m/ e7 _' `6 ~* s2 O/ ^
Same as 1.5.7.2 above but with different impulse generator for circuits with9 o; ~" c1 y; J/ ^# v5 Q( W" W
coaxial cable connection.
; R# E2 G' C' b' Q2 W4 y$ | E1.5.9 Requirements for varistors (VDR) specified.0 J- D3 {2 H' E7 f" ~
1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed' K$ q( b }, b% F
Primary circuit surge suppressors: only VDR allowed.
( O6 [& r; q6 }/ }1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
6 T/ d5 @% b9 Z9 a4 j" \1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional! C, g. f% _3 _: f. t* z
requirements.
- }$ Z. y) l* f. ?$ [! p8 W$ ~1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:# S8 _5 H5 r4 L5 x, Z
· one side of the VDR must be earthed
# K V9 P# D- s3 k, g· only possible for pluggable equipment type B or permanently4 d' y; j) U/ D$ m" c* q& S% m# _
connected equipment or equipment with permanently connected0 i- c4 y+ t8 ?4 w$ q9 V* Q
earthing conductor+ b* U0 B* p- B& O: R- E+ ^
· more restrictions for countries FI, NO, SE
4 y [9 k, h* o& \1.5.9.59 V( U+ {' Z% \% O2 [, j
New 2. u& w: A/ \; z% s3 c
It is not allowed to bridge supplementary/double/reinforced insulation by
% H% l: }7 a5 k* W3 ^VDR.+ o& g# t& p6 r/ t
1.6.1 Modified 0 "Note" for Australian national difference was deleted.- q5 [0 A3 }+ m) D ^) y
1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
8 {% |) B4 d- E/ N' Q1.7.2 Modified 0 Re-arranging of content of subclauses 1.7.2, 1.7.10 and 1.7.16. |
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