DSH 754 Screws, Creepage distance and clearance

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DSH 754 5 `; c. B$ W0 ?# J: Y$ K

Screws, Creepage distance and clearance

21.19 1 H' F8 P. Z; E- {* {3 J4 s

60745-1(ed.4)

Standard(s):
IEC 60745-1:2006
Sub-clause(s):
21.19
) y: N% |4 r3 F& UNo. Year
DSH
$ ]% G" H$ k9 Q) D4 I- x+ O754
2010
Category: TOOL Developed by: ETF 1
Subject:
; c  v" b) }* I* D, a3 B  ?" TScrews, Creepage
distance and clearance
7 c1 b0 L) \! w$ z0 AKey words:
3 M( }3 P8 T  m( P3 y1 |) O9 H- Screws
- force
3 V0 O( h! Y! Z7 K. S- Creepage distance and
$ E! b; N$ s9 l' ]3 n' j/ lclearance
: Y9 P2 {. B4 |+ T/ r. q' GApproved at the 2010 CTL
- U7 L" f7 m1 A) k  N$ L* |) b" yPlenary Meeting
, N3 u4 o: _- v2 F" @Question:
9 U& W7 }1 M% t; I( ^& O( e1)
- e- y6 ~4 V# @# z7 G% R“Tools shall be so designed that the protection against electric shock is not affected when
: o& j( i) ]1 ?! Z7 }4 Y5 Xscrews intended for replacement from the outside during routine servicing are replaced by
screws having a greater length.”
7 U7 T& H! K) d: w  ~2 c2 q. c7 LWhat screw should be used? Only the screws from equipment under test or any other
- r9 d. g6 I: m" M4 B! P5 Gpossible screw?
2)
“Compliance is checked by inserting longer screws, without appreciable force, after which
creepage distances and clearances between live parts and accessible metal parts shall not
$ Y$ b1 Z% z" W1 Bhave been reduced below the values specified in 28.1”
/ N7 \: }1 Q* g# V4 A$ E1 z7 oWhat force is to be applied?
+ W# f% o; ^2 zDecision:
* p- [  o: A# d* z' r3 Y7 m% o) j1)
/ u! ^  Q+ O, d& n* P% V5 V! MThe screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
2)
& u+ c2 N) Y" vThe force values in Table 9 shall be applied.