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| DSH 439
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| Connectors and Openings) P$ A+ V/ V& {% |: ?
| 2.1.1.1 f' @' y" K- A, m* ]) o& z* ]
| 60950(ed.2);am1-am4 & 60950(ed.3)
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! {9 e& D/ i7 p6 Q8 _Standard:
" ]0 x$ ^3 t8 V$ {6 i+ p6 eIEC 950 (1991) 2nd ed.,7 f! d9 m$ ~: a V- i6 W+ l. F
Amdts.1(1992), 2(1993),
& E: e! V6 @* B+ v4 r3(1995), 4(1996);
! {7 A) K7 M( D# N+ ` uIEC 60950, 3rd edition (1999), Z# e7 N" Z/ B5 g/ ?, S
Sub clause:/ b( x% B8 Y9 K4 e# v% i6 c
2.1.1.15 i5 Q& q/ W( A4 ?6 A4 k- ]
Sheet No.
: g, }1 [: V$ j! t439
; o1 M3 t2 z( M3 I9 x, S$ dSubject:2 f; [% g5 t( G" ?. ~% p( }/ u* \
Connectors and Openings0 q: b$ w+ F/ C7 S r" \* j# n
Key words:
% G3 j9 i1 T+ y- o! _Contact with hazardous
& k& O. }) J) Q7 @, W0 N7 f9 Nvoltages, test finger w9 R; O* O% t; g
Decision taken at the
. N, c2 \: a8 S* t4 ?3 A8 f39th meeting 20023 Q: Y0 r$ m! G! F, Z$ i
Question:
" I! H* [3 P& }# Z$ lIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of: z0 B4 i" b0 p ^, p; z
parts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test
! n% D/ b# b' m0 {2 D; F- |; sfinger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A
+ c& h* c; p2 csubassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that
5 l/ b4 ]6 ~6 r" f4 f& Zare located in operator accessible compartments and are removable by the user. If the power1 t* A4 u% h6 W0 X, ~1 Y3 ]
supply is removed, the supply connector becomes exposed within the compartment. It is not# z2 C# D- s; o" N+ h( x q
permitted to make a contact with a hazardous voltage not exceeding 1000 volts a.c. or 1500 volts
b3 l" j$ m9 O2 u" r) [d.c. Is this requirement sufficient or is there a need for an additional gap between the part at
7 k! Y8 F+ Z6 s/ P0 c- Y- Bhazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)?# z( a' L, i, e: H9 C
Decision:
' }9 E! g w& D1 u4 P0 u HContact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which1 V* v+ L3 l f. g; p
shall not contact parts described above when applied to openings in the enclosure (compartment)
; @% k) _( y' g, C4 hafter removal of parts that can be detached by an operator, including fuseholders, and with operator3 _0 ?6 K, a- {: W2 X0 y
access doors and covers open. It is permitted to leave lamps in place for this test. Connectors that
8 p$ k, y3 @# {7 u- n7 kcan be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC. n: N2 G' _# o3 j+ M- D! H o
60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in1 V/ A( K6 @9 ]- O% i% Y0 x
the above tests, there is no requirement for a minimum air gap between the tip of the test finger and' s1 M8 Z" Q0 z4 C3 d; x
the part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c.
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