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Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"+ g( S9 [7 W2 {9 X
? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006
" o2 q, y" k4 O/ U$ e8 O' N. ZSubclause Change ? Comment
# Q3 G9 M, q: \+ DForeword Added 0 Additional parts "22" and "23" mentioned that are planned but not published
- G1 U2 \1 F8 lyet (Mar-2006).
' b+ Y( T- Y/ u( r" h2 c9 q; u1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for
; ] H" m# _! S0 K) s* g- eincorporation in ITE.2 [' e5 \- \8 U1 M$ N( {
1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples.+ b4 ^" A7 F# N
1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION,
2 t. r' @, s: T z# S" zSHORT-TIME OPERATION and INTERMITTENT OPERATION).
# O. ^/ f. Z. ]5 |/ \& o, e( B1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types1 B d9 ]' t/ x! J- b6 Z# Y2 R
A and B.
& M3 v+ W3 {6 k8 } ^8 I( V( [& y1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply.! N6 x) z$ n: A3 U
1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term.
$ r6 j, ?3 l: ~- [: {6 W9 q1.2.10.4 New 0 SOLID INSULATION introduced as defined term.
0 P/ @8 H i( {9 M( i1.2.13.15 New 0 CHEESECLOTH introduced as defined term.
6 q2 f" T, H8 m/ m9 d1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term.
6 r6 t. E' j5 P. z/ E, Z7 {3 s1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to* y9 J. L- a2 Z F1 J! Y" h/ W
previous term "current rating of the circuit under test" of subclause 2.6.3.4.
$ d7 M) S8 q- |0 ~1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value" O' `4 G# `9 `6 Y
in the rated voltage range shall be used for test." T, r. D0 s: h8 ~/ J* }( Q
1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for8 ~3 V6 K3 |! @8 d
overvoltage protection of TNV circuits.
3 s9 q2 D) [. G) J3 i1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only- j- V0 [- j7 G6 W( X9 e) W
simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock).
% I1 Y- s- I9 L; b/ K. @) b! I1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting
* s" B7 b9 S+ X$ \second paragraph and old "Note 3".
2 i, ?9 `# s: o/ q; P7 B1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14., Z* R4 j1 r* F. O- S8 I! A0 R
However, application principle of X- and Y-capacitors not changed.5 _9 J- l! r1 b |4 B
1.5.7 Complete change and concept for bridging resistors. Detailed requirements) ^$ l) k2 Y6 }( L6 s
for:
( o( L0 q% h) X& d; X$ W' \2 _( C· Resistors bridging functional/basic/supplementary insulation (1.5.7.1). C3 N* B3 s; M% b4 @6 R
· Resistors double/reinforced functional insulation (1.5.7.2)% t2 p: z% |5 r
· Resistors double/reinforced functional insulation – Special0 t, ]; o2 q' {. J b. \6 b
requirements when connected to antenna/coaxial cable (1.5.7.3)
1 X+ I! S/ j4 L( ]6 t5 _1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors.
3 ~* W g0 ~! B& L# p1 Z1.5.7.2 Very different concept:. ^; ]; {" A# \! B9 o% u2 g
· Single resistor is acceptable if it passes "Resistor test"
* W* `8 E3 r" e" M· Group of resistors must either pass "Resistor test" or pass subclauses
7 G/ r! n, [: W/ }2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn* _" M2 c! `1 @( h. i! O2 z
"Resistor test":
- S0 |4 t& }+ O1 o$ EDamp heat test of IEC 60068-2-78 plus impulse test and resistance
. E$ a$ }! }# Y Y, ]! J/ G# A! y; D) [, \0 gmeasurement." e0 F" }& v) U3 ^8 J/ Y
1.5.7.3
/ u w( u: v4 F+ s; v+ LModified 2
9 [- ^2 `- n' X* q" j- FSame as 1.5.7.2 above but with different impulse generator for circuits with: E# g: M4 W9 J3 S. }9 r
coaxial cable connection.! N+ ~* ~0 ?$ l9 K4 `) o( t/ [; x
1.5.9 Requirements for varistors (VDR) specified.
% }4 k* K( z! n& @1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed& i3 K! `& p) \9 X# A8 k$ L
Primary circuit surge suppressors: only VDR allowed.
) O& r& a9 \) o" D# H" h5 |1.5.9.2 An interrupting means must be provided for protection of the VDR in series.
: V4 o% y( W' [# I: C1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional4 ^+ Z+ W# j% M
requirements.
* U3 H8 ^( z- x: X1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements:/ O2 d+ M& X' _/ {" u
· one side of the VDR must be earthed
/ ~- |" J" d' `* W, D% b! d* \· only possible for pluggable equipment type B or permanently
0 B% B8 {; E6 P8 j* `9 a* aconnected equipment or equipment with permanently connected4 [ L- J" d U1 V
earthing conductor6 W- f; R) Q& t( B1 Z" I4 H& h
· more restrictions for countries FI, NO, SE
3 N# _7 Q4 F b8 o6 j1.5.9.5 H+ u4 ?4 g# W; z8 a. v
New 24 M0 U P5 D9 ^# W4 l; i2 I, H
It is not allowed to bridge supplementary/double/reinforced insulation by
" o' _4 T: D8 c1 a4 yVDR.
) d3 r! E; ^$ P, V! E2 ^# ?1.6.1 Modified 0 "Note" for Australian national difference was deleted.5 C) o5 |5 y- ^# [! G$ K* R+ e6 v
1.7.1 Clarified 0 Clarification for the use of the Class II symbol.
- x. k, _+ {( N# V _9 ?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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