DSH 754 Screws, Creepage distance and clearance

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DSH 754 2 V6 M2 y5 `& f

Screws, Creepage distance and clearance 9 n- f( u% q1 k1 [0 _5 u& n6 W9 H! G

21.19

60745-1(ed.4) 7 I" |9 }" |% `* K' x  c+ F

Standard(s):
* o- l6 j6 ~* l! O  {IEC 60745-1:2006
2 o: U! }0 U( P+ eSub-clause(s):
21.19
& e0 f: E/ e9 l/ ?No. Year
4 k6 u% t. v2 K3 e# pDSH
754
2010
: D3 b8 N+ k" J; aCategory: TOOL Developed by: ETF 1
1 H( h5 l# D7 f& VSubject:
Screws, Creepage
& _2 U- B: i1 v& Udistance and clearance
Key words:
- {6 N) ]2 C# _6 |: e- Screws
% D8 V/ y+ m: a- force
- Creepage distance and
, V- {5 @3 H/ r3 f% hclearance
* _9 K' ]6 T* OApproved at the 2010 CTL
$ e5 M+ T( i" p( J' {- E8 E$ TPlenary Meeting
Question:
; O/ ?. s2 j3 W+ H+ Y' ^5 j3 ]4 V1)
“Tools shall be so designed that the protection against electric shock is not affected when
$ D4 i* m/ m; V7 T* V- {: Cscrews intended for replacement from the outside during routine servicing are replaced by
; w6 x5 m0 c/ U$ r: bscrews having a greater length.”
What screw should be used? Only the screws from equipment under test or any other
: ^0 t# m7 ~9 R% E9 Jpossible screw?
2)
8 c) G. o) e0 u8 D( B% G8 H“Compliance is checked by inserting longer screws, without appreciable force, after which
) f- z, F) A: W' d5 i0 }1 ?creepage distances and clearances between live parts and accessible metal parts shall not
have been reduced below the values specified in 28.1”
- n$ J' Q/ i3 s! z) M6 aWhat force is to be applied?
Decision:
1)
- B9 u+ c* `# j1 ^+ r+ q: xThe screw originally used on the equipment and any other longer screw that can be found
, l# H8 J; M$ M. v* c5 Lon the equipment is to be used.
2)
The force values in Table 9 shall be applied.
2 d& A2 d. z+ j9 A, I0 \3 t4 R! Z