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Standard: $ u! M+ X8 r1 h5 F* \IEC 950 (1991) 2nd ed.,2 P' f! K. O! J# E( z* P! V# q" c
Amdts.1(1992), 2(1993),# \ m) @3 n% f9 H# |" p
3(1995), 4(1996); & U1 T( I( d# LIEC 60950, 3rd edition (1999) ) R1 z: Y- I* D" o9 ~2 [' bSub clause: * u Y! b& @# U2 [& P" C2.1.1.1" z: b* ^2 y' f% l7 s
Sheet No. $ T6 J0 ~' C: G3 Q8 _4392 }$ ?$ ~4 U2 `* ^% K
Subject:6 C1 k/ Q J$ M% g" g0 g% A
Connectors and Openings, d! \6 W: M$ o( V
Key words: + C" L e- ~% I- T, |Contact with hazardous 0 L: g2 Q8 L2 Q- Nvoltages, test finger 3 U7 v9 w& I$ dDecision taken at the * ]9 b. D$ \4 U39th meeting 2002/ |' D. L$ C8 c" K) v7 R
Question: 6 W4 ]( C0 e% RIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of% J J+ {' n$ t# p
parts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test9 e# X$ I7 S4 ]* m$ P7 D
finger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A/ U6 C( p; A/ A
subassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that % r0 j9 F. R/ Rare located in operator accessible compartments and are removable by the user. If the power ! |; P& o3 ~4 `" r4 i9 Bsupply is removed, the supply connector becomes exposed within the compartment. It is not7 |: b+ x! V& d
permitted to make a contact with a hazardous voltage not exceeding 1000 volts a.c. or 1500 volts" K5 c+ I0 v& g$ g3 H
d.c. Is this requirement sufficient or is there a need for an additional gap between the part at " |) a! X' ?8 J. V$ @9 N: A9 }hazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)? " i* u) U' o/ WDecision:, I M% [6 ^+ h& n
Contact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which 6 c& |, Z, n0 v& ?/ j7 u9 Pshall not contact parts described above when applied to openings in the enclosure (compartment)7 q$ C' f% P: F# X) t
after removal of parts that can be detached by an operator, including fuseholders, and with operator 4 y0 G; I1 O2 P& {+ aaccess doors and covers open. It is permitted to leave lamps in place for this test. Connectors that4 r* b6 T# s2 z) p. N: `8 y+ Q. V1 V& @
can be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC. n* b1 D ~) C f6 N
60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in: f$ u1 e0 L4 P. |# u' {
the above tests, there is no requirement for a minimum air gap between the tip of the test finger and9 H! F1 M y1 A4 o3 ]: |7 ?( Y
the part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c. 9 C* i9 p& [) U: E+ W. j0 p , b5 e4 N ]8 ?4 o[attach]77164[/attach] , @- K% _4 N/ ^3 l& k7 `
DSH 439$ |+ W$ s# H1 D1 M5 l