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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
7 w4 H0 |! X+ {5 A& ^? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-20066 ^2 l) s/ i; P
Subclause Change ? Comment0 P M2 i% Y( v4 U/ P# \
Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published
; e. U/ H' ]2 e* O" Q1 hyet (Mar-2006).1 m7 b+ p2 c- z* c4 J) R3 F+ H
1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for2 O8 c( Z% r% Z9 ^( O
incorporation in ITE.
& q( \7 L/ ~6 n1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples.
$ o' ?' W- q& J }1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,
; a q$ ^& {4 J+ f8 N' JSHORT-TIME OPERATION and INTERMITTENT OPERATION).
3 v% `5 k) H8 F1 r' h" q: N0 Z1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types" T1 Y( m- r) b9 P" c1 l7 Y' f
A and B.) B, |& v( `+ L, g
1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.
3 m& U7 z3 Z$ q/ J1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.2 [+ j/ i- Y$ k/ _! ]
1.2.10.4 New 0 SOLID INSULATION introduced as defined term.0 Q% ^+ Q, {3 {2 \" Y2 ~
1.2.13.15 New 0 CHEESECLOTH introduced as defined term.1 t% s' V3 y1 h8 r% ^
1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.
8 a3 y' [6 N( A: F/ z, x1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to
/ K v* {: h( A5 a4 cprevious term "current rating of the circuit under test" of subclause 2.6.3.4.: Q; m0 w% v& [
1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value
" S$ }( M& ] d. M. e7 `3 uin the rated voltage range shall be used for test.9 T k( S; i. B
1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for
- M* Z/ ]" Z* r) }overvoltage protection of TNV circuits.
, m4 A* z! @. c& O$ N) _7 W% Y: h1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only
R% @" u7 S2 V' p1 }( H" Z7 psimulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).9 f7 Q. j5 D7 v' \& \
1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting+ ^+ h% S# N3 \0 m
second paragraph and old "Note 3".2 F' G! }" @4 |6 h4 ~
1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14.
# X" l; t5 F% o5 O; L/ t) R* v* j( R- OHowever, application principle of X- and Y-capacitors not changed.
5 t$ g- M. W. U% X4 a- h1.5.7 Complete change and concept for bridging resistors. Detailed requirements, w6 J1 @8 i0 [
for:$ `0 V8 \6 ^1 [: A* c# y$ z2 O
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1)) N% g _4 M/ {3 Q8 a- @6 g
· Resistors double/reinforced functional insulation (1.5.7.2)
. M2 B- w6 y$ }4 I) Y$ ~· Resistors double/reinforced functional insulation – Special
5 o4 m: @- y% j" e. Y# x; l* l0 Rrequirements when connected to antenna/coaxial cable (1.5.7.3)
# y: F+ _! p" z6 m1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.9 C; o y' K4 d0 h" r" h
1.5.7.2 Very different concept:& m; ?) L4 D( Q& Z2 k! E
· Single resistor is acceptable if it passes "Resistor test"
3 |/ t3 }9 g6 [. h4 m· Group of resistors must either pass "Resistor test" or pass subclauses
* ^/ Z6 E+ t5 s- N9 M2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn9 y- x, }" n2 `1 f! ?9 {' e5 U
"Resistor test":
' I4 D& A0 o; |6 q! w" iDamp heat test of IEC 60068-2-78 plus impulse test and resistance! w8 H @' U5 k* a" F7 L. S [
measurement.
# Y2 V$ s2 B, N0 |% y, A1.5.7.3
6 z/ t Y3 L2 p9 w; I& u: P+ xModified 2! o( u( @# c3 p9 o. z# j
Same as 1.5.7.2 above but with different impulse generator for circuits with
+ M0 T- |, Z1 h- q4 l& W! qcoaxial cable connection.
9 [ U( i9 g1 R. b! F1 q1.5.9 Requirements for varistors (VDR) specified.
; w1 ^% @+ G0 \# A' [! Y! {1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed
1 Z* q$ {! L! |Primary circuit surge suppressors: only VDR allowed.1 f8 N, J9 J$ P% T
1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
) S6 O/ w3 X' z1 K9 m1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional) y; O8 J. m$ N5 y7 m
requirements.
2 o- x; Y" ^' b8 o4 W1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:) P: V0 p3 k+ x, C% H3 E. }5 X
· one side of the VDR must be earthed
. y4 _1 d7 N$ h+ y, c· only possible for pluggable equipment type B or permanently
# h I& B6 E! |3 L# I9 E; {connected equipment or equipment with permanently connected: `8 q: B5 U8 g7 Y3 F$ T+ i" X
earthing conductor
. w4 M' y/ N: E* s· more restrictions for countries FI, NO, SE1 n$ c0 X* s8 L( N0 t" D
1.5.9.5
8 w: o3 U& M+ c z/ a: TNew 2, P& Q! b, H3 f) B% l- y t$ ~
It is not allowed to bridge supplementary/double/reinforced insulation by
3 O5 \; Y) C* TVDR.) m- k. B! |& {. o
1.6.1 Modified 0 "Note" for Australian national difference was deleted.5 n6 Z2 l: W! L: Z. X0 @
1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
9 h9 x; F7 c; n% K1.7.2 Modified 0 Re-arranging of content of subclauses 1.7.2, 1.7.10 and 1.7.16. |
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