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| DSH 754
2 E" |: Y# O# P; r | Screws, Creepage distance and clearance B2 k9 l1 i* F' s# N. F. P* n
| 21.196 P& ?' u, Q& C' A# h0 v1 ?& _
| 60745-1(ed.4)
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Standard(s):/ [. S6 `$ {9 I# S9 V, W4 V
IEC 60745-1:2006
: o/ G. g7 d0 j1 s; KSub-clause(s):
2 _9 s, v9 k$ ]0 O7 z- r21.19' O/ j6 u' y, @
No. Year
& }, u1 r% G" q" R* j1 DDSH, ^7 ~! d( S& X4 E1 t/ R
754
' z; f2 K$ ^: F% U# u) A4 I! D D2010; G1 Q ]) p* M* _0 ^& k
Category: TOOL Developed by: ETF 1
) p0 m# Y; @8 R4 D4 pSubject:
) z9 N$ j" n) y+ PScrews, Creepage% r6 \5 d0 z- O; j
distance and clearance
) x3 D1 L Q5 B+ m% [% EKey words:
# y4 s7 M) i% h+ ?- Screws
- B; z9 q {1 Q- force
; ~3 z. f/ d: | t3 U- Creepage distance and7 r* J) J+ c6 U @. ?+ Q( O2 A
clearance
" `( w$ V2 q; m2 yApproved at the 2010 CTL) \& \0 Z( j' ~) t e! G
Plenary Meeting& N& e6 e" \3 Q* v+ F; Q* F1 Q& [$ C7 S
Question:+ K, Y" c$ s* P+ A! D/ {
1)
' E8 Q4 o2 l7 d9 I“Tools shall be so designed that the protection against electric shock is not affected when8 t/ V4 M1 y4 W7 r! r
screws intended for replacement from the outside during routine servicing are replaced by
* S! l2 X1 e" S$ Sscrews having a greater length.”# }# L. p. g O2 |
What screw should be used? Only the screws from equipment under test or any other
$ R8 l$ V& }6 ]$ Jpossible screw?. t) P) _0 G! P) p h
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“Compliance is checked by inserting longer screws, without appreciable force, after which
3 Z* _; I; q" T6 P1 F4 q. v, F7 Zcreepage distances and clearances between live parts and accessible metal parts shall not
4 l! e1 Z# n; [' X% A mhave been reduced below the values specified in 28.1”, z/ T9 D; l+ Q! t' V/ _
What force is to be applied?
/ e( i& u$ x; n, V9 h) L+ Z/ i* NDecision:) \( K7 t3 V0 u1 m& ]% U
1)! p! g! v9 B7 |: u. } A3 C, z, m
The screw originally used on the equipment and any other longer screw that can be found2 k. w2 y T( T' }3 u/ u
on the equipment is to be used.
7 u5 x" O9 I, M) b c% [; n. k2 i1 Z* |2)
- k% F" q5 G }8 \8 J6 Z9 vThe force values in Table 9 shall be applied.
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