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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
# A( |9 T2 m/ _2 n? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006. A4 i+ D! a2 G- W, V
Subclause Change ? Comment
8 J, Y3 o H. R9 H0 m+ g: bForeword Added 0 Additional parts "22" and "23" mentioned that are planned but not published$ Y4 T+ ?, D( U
yet (Mar-2006).! f! a- H7 H+ k4 B1 a
1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for' c6 u$ A8 ~! I" ^) p8 b5 \
incorporation in ITE.
# C' u/ }2 I: E1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples.
1 Z q$ G" V+ s* }* N1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,
0 j8 L& \+ a3 w7 e! w- B$ ~SHORT-TIME OPERATION and INTERMITTENT OPERATION).
2 m% d: b, M8 ^! P' K6 @* j1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types
B" G. y8 n$ T6 _A and B." @- o- j- _% U: X6 x a$ }
1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.) L, \: n: r- R- x1 T4 Y8 m
1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.- x9 s: k. v1 U( i" i0 f
1.2.10.4 New 0 SOLID INSULATION introduced as defined term.
% F, K1 `; `9 E) T: }2 k1.2.13.15 New 0 CHEESECLOTH introduced as defined term.
, v. f) f6 M5 n* ^1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.5 t; j' L' g- g K) ^! a, }
1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to
' e9 `( z2 Z1 ^/ Zprevious term "current rating of the circuit under test" of subclause 2.6.3.4.( a, e- Z* j( \( X8 Y
1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value# t' t- M$ \0 H6 J) |4 y# V. M
in the rated voltage range shall be used for test.
( b, i+ l: P* q I' \/ F# x7 Q" T1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for2 ^/ B: l$ f+ a' o6 ^/ y
overvoltage protection of TNV circuits.% O0 g: |- O$ h3 V' ~) I
1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only, q2 `# r" p: ]8 H$ x' g
simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).% O( L/ u2 _: F
1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting
" N3 _0 r7 E6 c. A6 _/ E. C/ Esecond paragraph and old "Note 3"." j8 y% \6 ` K4 ]) B# I8 W
1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14.
; d4 S' i; j# f- P% v* iHowever, application principle of X- and Y-capacitors not changed.7 e1 A& \0 f8 |! h0 w: G7 X% H0 k
1.5.7 Complete change and concept for bridging resistors. Detailed requirements
2 d! n5 Z% V5 F7 @( z" j' O- V. zfor:+ Q/ _ \" ?# g: ^3 C
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1) x7 a! D, s7 g5 c" D% b/ r( d( D
· Resistors double/reinforced functional insulation (1.5.7.2)
1 g. L' J L! p# c; U/ R8 a- r· Resistors double/reinforced functional insulation – Special
: k9 p4 s/ m) O! z" B! arequirements when connected to antenna/coaxial cable (1.5.7.3)
" C! X2 Z1 H1 H! y1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.! `& D' w! I( T2 [# U$ N9 B% n
1.5.7.2 Very different concept:1 z3 k4 \" B4 C
· Single resistor is acceptable if it passes "Resistor test") V& m o) ]9 c' d0 S+ E& }
· Group of resistors must either pass "Resistor test" or pass subclauses3 n2 r* l2 e0 d1 U7 D. }
2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn
6 s& O. ~1 J2 z' n5 @3 Z5 c; }* \"Resistor test":
1 b: Z4 q0 ?9 [+ [+ c8 eDamp heat test of IEC 60068-2-78 plus impulse test and resistance
+ u3 ]1 H' D) y, l& y9 ]9 T. {1 cmeasurement.
T2 o( g6 M9 {& Z: t" M1.5.7.33 B7 Q! \5 }6 X# h
Modified 2
$ o; w0 a, I+ g* e$ ?) u3 e3 g% W) ~Same as 1.5.7.2 above but with different impulse generator for circuits with& t* y) \7 A" m& A' `( Q) h: ]
coaxial cable connection.
; X, C' b% _# X2 } \6 y1.5.9 Requirements for varistors (VDR) specified.* y! U" {+ a- [- R3 E; [
1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed
, w& [- F, d0 _( y" F: q* | xPrimary circuit surge suppressors: only VDR allowed.( ]1 @8 g5 d, G0 x5 G5 e. L
1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
* K; l/ {4 \2 u% U+ Q) a% |/ Z" W1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional
8 q" w4 P2 k- e& f5 y) [requirements." F- M* v) |5 X5 b9 A2 T9 e. d
1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:# R2 ^' F9 H8 G$ _" {9 X
· one side of the VDR must be earthed
+ x& o1 z; r% x T· only possible for pluggable equipment type B or permanently
8 H& q6 c8 n# yconnected equipment or equipment with permanently connected
, r2 A( Z7 p# P) ?% `! b/ J J, Mearthing conductor" v9 U4 a: l: [6 V
· more restrictions for countries FI, NO, SE
P1 J$ E, D: I& V/ @1.5.9.5
/ ^$ x* c4 o5 V6 ~! \New 2
! @# I5 L2 M1 F0 {It is not allowed to bridge supplementary/double/reinforced insulation by0 R4 h8 f( C, u T3 d% f
VDR. ]( Z9 P& ~% X$ W
1.6.1 Modified 0 "Note" for Australian national difference was deleted.
# E( w. c* M$ H4 x% Y1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
6 p- q2 R) j o u2 `( `1.7.2 Modified 0 Re-arranging of content of subclauses 1.7.2, 1.7.10 and 1.7.16. |
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