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

各种试验指现货

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

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

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

热电偶焊机现货

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 # L. {/ ]6 ?& z2 N3 U: Y) g

Connectors and Openings

2.1.1.1 & d% m1 [: V5 c  K& m

60950(ed.2);am1-am4 & 60950(ed.3) & y# |. [* {! P5 B9 V

Standard:
IEC 950 (1991) 2nd ed.,
: h0 a$ Y$ ^: U- `+ K3 `2 o$ pAmdts.1(1992), 2(1993),
3 ^! i9 j, X& L5 t7 r7 r. ]3(1995), 4(1996);
4 V4 c( A1 ]4 X. ^IEC 60950, 3rd edition (1999)
( z6 @, v0 ~+ |Sub clause:
1 ?$ k+ n2 L! g2 M. L( J2 b2.1.1.1
7 m: G" c) R2 w( H2 a  NSheet No.
( c. M0 b0 ~; U% V3 v2 `439
1 k& x4 b/ i  A$ t/ sSubject:
Connectors and Openings
) ?! c2 m, h. g3 S7 j/ R. ~! oKey words:
Contact with hazardous
voltages, test finger
, T! ^" F) v0 T: kDecision taken at the
39th meeting 2002
- H0 A' P0 S' m' L9 rQuestion:
. f  W  O7 P# UIs it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of
parts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test
% `7 d3 Q( D5 ~" U- C" ~2 ^; ffinger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A
1 p) X* ~- ]9 d) q. r! \; A2 psubassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that
- }7 j. ?5 ?' b+ V4 hare 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
9 m  n7 m' O0 Q% r% Hhazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)?
! J% \, P( z0 UDecision:
& S/ O' ]* L# X$ Y' \5 l) D# Z4 zContact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which
shall not contact parts described above when applied to openings in the enclosure (compartment)
' m# Z. e. x8 @& _6 `  Kafter removal of parts that can be detached by an operator, including fuseholders, and with operator
. p! k, F& {' Y7 ^/ k0 P, h' t4 Oaccess 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
60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in
6 L8 ^9 f1 m* ?/ w$ T/ hthe above tests, there is no requirement for a minimum air gap between the tip of the test finger and
' E7 R1 B$ q, y; s, hthe part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c.
, K' B7 j0 r3 B

' \+ r4 i) }( k, Q- q