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| DSH 754
3 K. m- s+ z/ t# ~. o3 B. }$ d | Screws, Creepage distance and clearance2 @& A" V) m. h1 W/ P$ Q
| 21.199 m" B- y/ { {! w+ u/ d
| 60745-1(ed.4); k# r8 z2 Z% b, O5 V
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. u0 g a9 E6 E3 [. U U. PStandard(s): e% M( s1 w ]) U5 m8 e8 P
IEC 60745-1:2006
5 F& x: ^! i1 a/ h6 E$ J4 M6 F' P1 @, CSub-clause(s):
% f5 V/ V, C& ~4 f8 X) M! I3 N. s21.19
( F6 [6 C% K4 z$ w& j3 TNo. Year1 Y$ j. x) y5 P* L. c/ ?, \+ ^# O4 w
DSH
1 M; T. @- R! p: ?* K; y, W2 d d. T. Q754& K) t! K8 k3 x |
2010) F/ _0 t8 X, q R3 }- P# g
Category: TOOL Developed by: ETF 1! m1 e. P/ f# d/ `' ?
Subject:( H- k) g. r0 I) K" M. _* ^+ F
Screws, Creepage
" t8 B0 [6 o) e+ H& {! bdistance and clearance
! M7 `4 H x5 z2 c% z) PKey words:7 h/ T% Y7 `3 N9 {7 h" F. B3 N
- Screws
6 |1 Y0 Z* V' Q+ C. _" r( d- force
6 m7 e U) l. ^, J0 N- i- Creepage distance and
9 I& |8 _2 F+ M, z. v( ]clearance
9 f/ h- C3 e+ g! tApproved at the 2010 CTL
1 g( [8 {8 {6 j2 l9 FPlenary Meeting
, ?3 v0 F k! W- Z( g8 ^Question:
! R2 X3 \; ?( I- k/ s1)
& b* X' h$ Z: {; s/ v8 d( B7 ~“Tools shall be so designed that the protection against electric shock is not affected when
9 N' }$ } \$ O; D0 xscrews intended for replacement from the outside during routine servicing are replaced by5 W) f9 A# Q+ C: l
screws having a greater length.”$ y$ m1 v {! b% f3 t- L9 t
What screw should be used? Only the screws from equipment under test or any other2 T+ C1 a3 u( J& t' |2 a6 |& m
possible screw?
1 i$ w, u$ D, y7 k9 T9 e+ o# G2)/ [2 \8 Q/ r: c2 D9 M& R# q* z' E, ^
“Compliance is checked by inserting longer screws, without appreciable force, after which) ?; s- q* T% J H3 v/ ?% s
creepage distances and clearances between live parts and accessible metal parts shall not; f2 A4 g1 K, J" ~. h/ C5 p
have been reduced below the values specified in 28.1”
4 Q/ f$ B+ H+ |! aWhat force is to be applied?
+ A+ b% \! n+ K# ADecision:( O& }0 h9 B/ `3 z/ f6 B4 M
1)# s2 p+ u# Z0 }$ m: M* v- d
The screw originally used on the equipment and any other longer screw that can be found6 J) P. d m2 B4 Q
on the equipment is to be used.+ E* O1 K4 l4 K& }& r
2)6 q& w$ ~, g6 ^# [6 x
The force values in Table 9 shall be applied.
& @- d+ m6 Y6 J8 ^# h9 J( r; E2 v- R T
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