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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
3 t0 f' b6 w H" e! J% S, F? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-20064 b* U4 L' k7 o4 q Z
Subclause Change ? Comment9 m9 E. s6 n7 r6 x3 o G
Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published6 |5 d: x; w7 F. o _9 u3 m+ [
yet (Mar-2006).) S e9 h7 b- O7 d) w7 L
1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for" j: G, F& z. _6 D1 n6 F/ o2 {: ^, M
incorporation in ITE.) c* t* u2 f+ Z
1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples.7 p/ S2 L& m/ w9 z) e( F2 ~9 H
1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,
+ v' `3 K" _: ^% m3 T0 ~SHORT-TIME OPERATION and INTERMITTENT OPERATION).* \5 j% _- N) B) B
1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types, {8 D! }: t; x# S: M
A and B.) ]1 U' M/ h; w1 C, ^! i
1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.; ^$ t, e! U* Z O, {3 V) Z
1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.
- t: k0 f& y5 P0 x9 Q1.2.10.4 New 0 SOLID INSULATION introduced as defined term.
S1 ^ V K6 P& \5 u" P1.2.13.15 New 0 CHEESECLOTH introduced as defined term.5 z" S$ l7 q6 k
1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.) w& ]6 u& E" a7 R5 s
1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to: V8 B" }. v- V
previous term "current rating of the circuit under test" of subclause 2.6.3.4. G- M5 J! n2 Q3 i
1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value
& n/ j5 a/ A, X- @1 Kin the rated voltage range shall be used for test.
9 C0 |$ n( g# t4 c# ~/ `1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for
8 N b2 q& I& {4 Kovervoltage protection of TNV circuits.& O4 V6 @- V3 U" e" G
1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only1 A: B7 I) j3 O5 N k
simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).
# K, O9 R5 ~( S. O9 ?3 _* [, I# p1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting
8 p% V) G+ I* e& K+ @) Usecond paragraph and old "Note 3".
- w0 \" S( p/ V3 Q$ ?! `) |5 p1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14.1 v- ?1 ~4 [" I' e$ T) z
However, application principle of X- and Y-capacitors not changed.
( C, T* v/ @3 J9 m) G& y/ V1.5.7 Complete change and concept for bridging resistors. Detailed requirements( u: h, h0 e Q
for:! n" C }$ t. l9 m4 b+ s% q% i
· Resistors bridging functional/basic/supplementary insulation (1.5.7.1)/ t9 Y; M' J. V, \* c: I1 L5 W
· Resistors double/reinforced functional insulation (1.5.7.2) {4 Y9 K& d7 h* h
· Resistors double/reinforced functional insulation – Special
* Y* z9 }0 i7 o, W" Krequirements when connected to antenna/coaxial cable (1.5.7.3)
3 D% X) j+ |: t* \1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.
5 [) y$ m/ ^/ ~# ]1.5.7.2 Very different concept:
* L5 i2 _+ r4 a& y· Single resistor is acceptable if it passes "Resistor test"
4 ~0 K& M: y/ |( w( c· Group of resistors must either pass "Resistor test" or pass subclauses3 B6 I9 K! Q' f {2 z2 h
2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn
* G2 m2 c" P8 [+ A3 ^% H. p"Resistor test":1 F7 Y9 i P9 P( O& Z6 z
Damp heat test of IEC 60068-2-78 plus impulse test and resistance
. B8 M1 C1 d5 T3 D6 Hmeasurement.
+ W) J8 o( a+ t: |1.5.7.39 M5 I: J1 d$ y2 m3 y) t: h; o9 B- `
Modified 2
& f8 M( F- L! N: V+ KSame as 1.5.7.2 above but with different impulse generator for circuits with* e5 R: x" |2 m6 w' U5 e1 ]
coaxial cable connection.
, u/ q4 e8 _; K5 x* `5 D1.5.9 Requirements for varistors (VDR) specified.
I, B" C, v# f- t- j1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed; b1 Y* q ^5 _
Primary circuit surge suppressors: only VDR allowed.
4 d- L5 |! B" [+ Z; r8 k [1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
7 K! B# h4 D( \% b* q6 ]$ {1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional, v, c! @# ]& b+ X" J
requirements.
/ @2 l, ?, U1 a) \: g1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:
6 c" {4 v s1 t$ ^· one side of the VDR must be earthed
) |) p2 s- Y+ x) z6 L· only possible for pluggable equipment type B or permanently0 J2 u8 V! Z8 ?& I% E+ \
connected equipment or equipment with permanently connected
7 C, w* H7 ? u: dearthing conductor6 Q; p% _# S8 E3 z
· more restrictions for countries FI, NO, SE
' L. |6 a8 A& n; D) Q4 E8 q& P- L0 ]1 O' ~1.5.9.5
; o, k; M+ Z8 i! x6 W7 r3 RNew 2
0 B$ k. s/ n/ a- p1 aIt is not allowed to bridge supplementary/double/reinforced insulation by
4 l8 I' j& n( q1 x4 I; A R1 Z5 OVDR.- _) d+ D. k {- x
1.6.1 Modified 0 "Note" for Australian national difference was deleted.# |; p& e$ w8 d0 Q8 j
1.7.1 Clarified 0 Clarification for the use of the Class II symbol.! F# Y$ l. c, o, o% o
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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