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|  DSH 439
& b# E' u ~4 T" l8 m3 }/ c4 U: ~; X+ N$ X# k! H% J
| Connectors and Openings
# H+ y% f" ^ B$ Q) m | 2.1.1.1+ b" E, A2 G4 ? c0 b' W" b. M
| 60950(ed.2);am1-am4 & 60950(ed.3)
* V) e, M0 [; X @6 R% |! w |
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Standard:
! d! t. x3 ^ I0 t+ Z) d2 jIEC 950 (1991) 2nd ed.,
) {9 U0 R( \) i# e9 lAmdts.1(1992), 2(1993),( A1 ?8 i1 K8 ~4 }' @9 V) ~+ Z
3(1995), 4(1996);% q* z! q* O' G* h3 S" G
IEC 60950, 3rd edition (1999); X9 p8 ~# b* T# w& C5 B, g7 P/ ~
Sub clause:) F& l" v. a" e! Y
2.1.1.1
. R& @+ }6 a. L# XSheet No.) G+ H4 F5 N4 e- `4 U; x0 P% V
439
7 t! a0 N' u. k! PSubject:
! r c+ E( x4 q6 J; C3 xConnectors and Openings, I" g2 t& B+ }+ U3 S
Key words:
3 B7 `0 i8 k- f' IContact with hazardous7 y* ~4 F# x- n: \% t T
voltages, test finger
* a# e z' w, Z% x, d8 @Decision taken at the
/ J0 c# H4 `, G. v/ r39th meeting 2002 H0 O$ I- _. n( R0 X* f! F9 o! \
Question:2 E$ [& Q9 X" G( v1 |# m
Is it the intent of the fourth dash of Clause 2.1.1.1 which reads “-functional or basic insulation of
3 `# b/ J& h9 Rparts or wiring at hazardous voltages” to include a 2 mm air gap of clearance from the tip of the test
/ T/ h: i( z& L- x$ i5 Sfinger since that dash says “basic insulation” and 2mm or clearance is basic insulation? A; P) K$ U( t, C% B2 z* a& Y1 x
subassembly of IT equipment (e.g., uninterruptible power supply) has modular power supplies that" ^" x* y% j Z. d# P, f
are located in operator accessible compartments and are removable by the user. If the power
9 z+ E. Q9 o2 p7 k! h. ysupply is removed, the supply connector becomes exposed within the compartment. It is not* T+ i2 ~4 y6 D& i& X; M
permitted to make a contact with a hazardous voltage not exceeding 1000 volts a.c. or 1500 volts( F& N$ r3 q. O+ G% N
d.c. Is this requirement sufficient or is there a need for an additional gap between the part at
1 g& @( X& k" D/ V& Ehazardous voltage and the tip of the test finger figure 19 of IEC 950 (figure 2A in IEC 60950)?( x+ m2 ?! W' {, v# _/ N% y V
Decision:
8 q; C9 ~: N) C: Y* {Contact is verified by means of a test finger, figure 19 of IEC 950 (figure 2A of IEC 60950), which! {( R M9 V7 t* J( R0 M
shall not contact parts described above when applied to openings in the enclosure (compartment)
+ i1 U6 p, `5 J! `6 W5 I2 uafter removal of parts that can be detached by an operator, including fuseholders, and with operator) M+ X; `) K- O7 ]
access doors and covers open. It is permitted to leave lamps in place for this test. Connectors that
4 v; v4 `) i& A2 ucan be separated by an operator, other than plugs and socket -outlets complying with 60083, IEC
" L! Y2 h% q: T1 G, x, t. E60309 and IEC 60320 shall also be tested during disconnection. Where contact is not permitted in
8 J" l2 a; W' {3 ^4 othe above tests, there is no requirement for a minimum air gap between the tip of the test finger and
, v/ e. [8 H& Y2 U' Qthe part at a hazardous voltage not exceeding 1000 V a.c or 1500 V d.c./ W: z' U+ S8 t9 ~
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