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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可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

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GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

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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 . Z* V) O" q0 o4 _" a

Connectors and Openings   c/ d) g! T/ q7 A& ^8 K0 L' J+ ^$ }

2.1.1.1

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

Standard:
, k$ P4 D" U/ L: @2 h! {IEC 950 (1991) 2nd ed.,
1 m* H* |5 x; }& f% d# k/ vAmdts.1(1992), 2(1993),
3(1995), 4(1996);
IEC 60950, 3rd edition (1999)
1 V- _& e9 D9 y8 B7 ~, nSub clause:
2.1.1.1
3 Y5 c. n4 T) O4 hSheet No.
439
" x5 i1 Y2 Q: L* h; k3 |7 R1 c) Q4 rSubject:
Connectors and Openings
" e0 S0 |; G$ m! [/ v- HKey words:
Contact with hazardous
6 b5 j1 l6 r: w6 s8 w7 yvoltages, test finger
- D4 Q' a1 L  N6 @9 v4 {0 ?Decision taken at the
9 C, S8 B% F* l7 Y0 B& I0 ^39th meeting 2002
Question:
' V* z% \( ^  i; WIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of
  h# H5 j* _' L6 i: V7 hparts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test
2 y$ \/ A) l$ I9 K: f/ {9 `9 Sfinger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A
subassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that
+ O. x( w- B  {are 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
permitted 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
hazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)?
! T$ u1 A. s8 W! B0 C, y: MDecision:
" z; X1 F/ ]' i3 c+ aContact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which
6 z5 q' M6 V2 Y$ H* e# _; Fshall not contact parts described above when applied to openings in the enclosure (compartment)
after removal of parts that can be detached by an operator, including fuseholders, and with operator
7 c& {9 X5 I' t' u4 W( Saccess doors and covers open. It is permitted to leave lamps in place for this test. Connectors that
! l2 A- m/ i! v+ D/ ?# s7 Xcan be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC
60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in
8 y+ H' o* I# Qthe 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.