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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"* `# H% c6 U3 {* V h% ~9 {
? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006
. v7 _% N$ R3 d# ]Subclause Change ? Comment. D% P5 r; R# `8 _ F# s
Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published
% D$ S/ F- r4 a; U( z m: zyet (Mar-2006).+ L; P) [ h# R7 [. q
1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for8 K% S4 ^ G+ d! A: |% K
incorporation in ITE.) O. L9 j8 a p9 L/ l
1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples., U0 p2 v6 E: k" Y( ?" X
1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,3 r* K7 _% ?+ z; [7 | F
SHORT-TIME OPERATION and INTERMITTENT OPERATION).9 i2 [3 R+ u4 i
1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types
- ^- _7 ?4 Q) p: Q1 YA and B.
8 F/ d2 z+ {1 L. i: w1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.
& Y! |+ |! \" u% b( {1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.
' j; E& K1 I4 N+ Z* ]4 e. I2 ~1.2.10.4 New 0 SOLID INSULATION introduced as defined term.. a6 }: ?' R' F4 `
1.2.13.15 New 0 CHEESECLOTH introduced as defined term. ]( ?$ L& j6 e% H) Y
1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.8 }+ h) l- A3 D. V5 \. x9 \ u
1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to
, j* f j( l/ T( B8 ^. R: V3 R5 zprevious term "current rating of the circuit under test" of subclause 2.6.3.4.
5 F: R: C0 X% J- n# f) h& A1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value* [* Q$ ]3 ~& ` G5 V. o- b
in the rated voltage range shall be used for test.# k% Y" c) e3 y2 j
1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for2 L$ @: P7 V9 c
overvoltage protection of TNV circuits.4 Z* R3 H1 P3 N( u7 r i, i
1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only
- ]; I1 g( G' e. E/ g5 j' Tsimulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).. W4 ?3 H+ E0 a1 ^; B7 r
1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting( } }+ e: M3 s$ G3 x$ @
second paragraph and old "Note 3".2 O# E* U8 [8 P/ ^' e. I
1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14./ g1 b( Q8 f1 w$ s; b, f
However, application principle of X- and Y-capacitors not changed.
; P/ y4 v4 w2 z$ b6 H' H& J1.5.7 Complete change and concept for bridging resistors. Detailed requirements5 Y8 c4 ], E0 j" T
for:$ F! _! v. n+ N ]
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1)8 D0 J/ F1 Z& R m- \8 Q5 w
· Resistors double/reinforced functional insulation (1.5.7.2)0 G0 L' j# y+ I5 U
· Resistors double/reinforced functional insulation – Special0 Q* J# c6 e, ~9 i: Y
requirements when connected to antenna/coaxial cable (1.5.7.3)
6 u8 I+ Q- |7 t9 h; L1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.
: B- I3 {) m! H" z' ?7 o9 q) a- u% t1.5.7.2 Very different concept:
( |# {7 f% h" R2 `: j- c· Single resistor is acceptable if it passes "Resistor test"* I, |6 q/ f1 J7 W5 Z
· Group of resistors must either pass "Resistor test" or pass subclauses
- h# `0 N+ w- q, o6 P9 a2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn- @9 [, f% Q* D( K$ n
"Resistor test":$ l; e. ^9 K: G, ~/ L* u* N- L. v8 W
Damp heat test of IEC 60068-2-78 plus impulse test and resistance6 ~' O% o+ D4 Y3 d6 {. `9 p
measurement.6 A( N+ [6 R. V# `
1.5.7.32 G+ t9 J! D3 V3 A. l p
Modified 2
% T1 @0 f, ]+ i& N, p* Y6 J, ^6 ` |- wSame as 1.5.7.2 above but with different impulse generator for circuits with
4 ?: A2 ?. b2 U! c7 Ecoaxial cable connection.
3 u& O5 _* U' h( Y1.5.9 Requirements for varistors (VDR) specified.
6 S9 i, r+ d2 U/ V3 `0 Y1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed/ c, l# |* N& I9 E8 E
Primary circuit surge suppressors: only VDR allowed.- V! ^2 M9 ?- `4 c {7 X& S$ o
1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
- |3 v3 V/ U8 N9 b1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional
- m2 I% q# y& W+ b5 q0 Rrequirements.
( y7 T, z4 M( s# ?1 l8 a5 R8 K1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:
" L+ c8 B, V7 S* U4 @· one side of the VDR must be earthed
" p. F) o- P; U7 [- K· only possible for pluggable equipment type B or permanently# g" s4 s. _; O) Y2 ]0 P/ Y
connected equipment or equipment with permanently connected. c9 L% o: N/ \5 N& n
earthing conductor
2 ^: e( V6 H0 R3 w5 W% ^) W· more restrictions for countries FI, NO, SE
1 W9 H2 h: r- p9 `' Y5 \2 Z X1.5.9.5& ]2 D: P$ B9 f$ j/ D
New 2# n3 O* K: q3 ~% w
It is not allowed to bridge supplementary/double/reinforced insulation by
8 n/ c0 s1 d3 f0 iVDR.
2 }+ e# U" e% a" Y' S& |/ Y! |* B1 h1.6.1 Modified 0 "Note" for Australian national difference was deleted.
4 z; J5 u- K; Y; o1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
0 j( J4 v1 p# l$ k7 N+ N% l8 O2 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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