1 A6 x/ z1 D, m: j/ JStandard:9 E9 e! h- ~* l3 A, ]; n% ~: T0 s
IEC 950 (1991) 2nd ed.,2 |5 s2 a. t( E/ b$ U& J
Amdts.1(1992), 2(1993), B+ _7 o: m) i9 y" G6 }' B
3(1995), 4(1996); : ? J& N# }1 l; e5 v9 FIEC 60950, 3rd edition (1999) . z% U9 y! Z% \1 p1 B! FSub clause:2 Z) h# C9 E/ F4 c2 ^; ~
2.1.1.1% X7 ^+ f$ K2 s0 h1 `5 A9 C4 N
Sheet No. ) v# _8 I8 Z/ B/ M( |5 k, `439 8 w( s& R3 C% W; T. KSubject: + b+ X' B. c0 [! c% GConnectors and Openings3 R0 |0 }7 o% \
Key words:, f; A8 B6 `' ]$ ^1 l2 F1 a# g! \
Contact with hazardous ( E3 x4 A5 x: }voltages, test finger" _3 U) s8 F+ {" p; w+ g; O
Decision taken at the 1 K0 ~% E# A& R" t7 M# l* p39th meeting 2002" f h2 h1 ~ k3 [" n
Question: 4 \0 f+ p' d3 Q+ VIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of" C8 T5 A7 W3 Y% b
parts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test $ P o6 Q6 l f$ nfinger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A 4 @2 Q4 b; v9 V r0 [( _3 u( {subassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that( m7 ^/ Y& \8 A$ B
are located in operator accessible compartments and are removable by the user. If the power ( t5 k& Z* ~6 isupply is removed, the supply connector becomes exposed within the compartment. It is not ( ^. K& ^ U7 ]3 ~2 Q, kpermitted to make a contact with a hazardous voltage not exceeding 1000 volts a.c. or 1500 volts8 @* ?5 b3 u4 M: u0 ^
d.c. Is this requirement sufficient or is there a need for an additional gap between the part at% b2 w7 J( w; J6 \
hazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)? y; ^! l1 l7 f) @, H
Decision:% _8 G2 u) L9 p5 y% S
Contact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which, L+ o. b) C/ ] E+ \ h( Z
shall not contact parts described above when applied to openings in the enclosure (compartment)' A9 D3 D9 o+ m. ] _+ p( p/ {
after removal of parts that can be detached by an operator, including fuseholders, and with operator2 S$ G* c, p/ ]+ T# ~; j
access doors and covers open. It is permitted to leave lamps in place for this test. Connectors that / C2 ]8 B; ~ Ncan be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC1 n: N9 L/ n& T! Q1 L8 [
60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in : \# ~3 H! |6 d, N4 c8 Nthe above tests, there is no requirement for a minimum air gap between the tip of the test finger and * D4 T6 Z. j3 K3 [! ]the part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c.! c+ C5 V) |4 S0 ~+ C# i% `
DSH 439