DSH 439 Connectors and Openings

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广东安规检测
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小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

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IEC61347/UL935镇流器热试验箱

灯具防风罩

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UL498插头插座量规

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家电温升测试角

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家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 439 & T# Y3 G# f" v" \5 p

Connectors and Openings 4 x$ I6 d* N! @, m8 h

2.1.1.1 , X, C# L* Q# U5 m

60950(ed.2);am1-am4 & 60950(ed.3)

Standard:
7 v1 O3 e$ F5 a- W$ hIEC 950 (1991) 2nd ed.,
8 ~% h6 t. _( ~$ U/ [Amdts.1(1992), 2(1993),
: v; ^2 E4 a! J4 a, V4 H5 P3(1995), 4(1996);
IEC 60950, 3rd edition (1999)
: J& D) X! O' F# {- b5 W1 USub clause:
: [* B( {# t7 c3 h  i2.1.1.1
Sheet No.
5 k' Q6 E( o" O& U  P439
Subject:
Connectors and Openings
Key words:
Contact with hazardous
6 t+ `  A9 x- I/ V) `voltages, test finger
8 o7 A) M2 j* q4 v$ e- L$ C* SDecision taken at the
39th meeting 2002
3 I6 @( N5 b2 R& wQuestion:
9 ]8 l* t# j% Z* f, fIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of
/ Z. F+ r* h# Jparts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test
finger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A
7 P8 a6 e5 f% _9 `# t# fsubassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that
$ Q8 W2 V1 N2 ^6 X5 P$ k, pare located in operator accessible compartments and are removable by the user. If the power
supply is removed, the supply connector becomes exposed within the compartment. It is not
* D" c# x3 @- tpermitted to make a contact with a hazardous voltage not exceeding 1000 volts a.c. or 1500 volts
d.c. Is this requirement sufficient or is there a need for an additional gap between the part at
! @0 X% {1 A* u  O2 shazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)?
# C# q; H' y6 W3 v. ADecision:
$ C+ |% B8 l- D5 E& V) `Contact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which
! j/ {1 d3 H, c! hshall not contact parts described above when applied to openings in the enclosure (compartment)
3 L+ V$ N; H7 h, M2 i7 w, {after removal of parts that can be detached by an operator, including fuseholders, and with operator
3 p0 N. S2 j% ]2 e8 O' baccess doors and covers open. It is permitted to leave lamps in place for this test. Connectors that
can be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC
: r6 L8 C" T- m4 U0 `/ Y9 K+ m60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in
) n; D6 F# z& c- T4 ^) f3 Ithe above tests, there is no requirement for a minimum air gap between the tip of the test finger and
the part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c.

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