DSH 261 Requiremwents for parts providing earth continuity

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DSH 261

Requiremwents for parts providing earth continuity

27, 28.3, 28.4

60335-1(ed.3) " v* Y, d5 Q7 \3 |: Y/ V$ A0 l+ A

Standard: IEC60335-1, Ed. 3 Sub clauses: 27, 28.3, 28.4
1 G6 m% h6 D6 @1 P" A; D. V+ ASheet n. 261
$ N& b2 n5 i+ M( h6 Y5 ^! XSubject: Requirements for parts providing earth continuity
0 ?: I: W3 ?! f1 @Key words:
- resistance to corrosion
- ?, q  ^4 b9 M, \" i! c- space threaded screw
Decision n. 17 taken at 35th meeting/1998
Questions:
  S- ^; |. j1 T) H5 ]8 F, _+ ^1. Clause 27.4 requires that parts providing earth continuity shall have adequate resistance
to corrosion. In particular, steel parts are required to have at least 5μm electroplating
) p5 e* r( n6 @2 [6 z: m% EOn what basis are laboratories stating compliance for this requirement?
1 \6 z% o: T: G. ]5 y2. In the instance where a space threaded screw is used to provide earthing provision for a
' |' a3 w9 n2 Z; Pmotor frame (for instance), is the use of a space threaded screw without the use of a spring
$ X4 A' ]( g) V2 j& h% Cwasher a satisfactory earthing method for unpainted surfaces, considering the requirements
+ M7 Z0 }: h: y! G3 c, _& i, Pof clauses 28.3 and 28.4, with the example of figure below ?
0 B# W  i  `/ A' V  k  H. ADecisions:
7 C$ {9 e6 P0 M1 – The adequate thickness of electroplated coating for steel part providing earth continuity
1 M8 a# K: {) Mis checked as indicated in note 4, using ISO2178 or ISO1463. The manufacturer declaration
5 \' u* X# D' F& P7 ~0 F( lof compliance is also accepted.
3 L* |/ _6 D- K, j0 p2- The construction presented is not acceptable. The use of space threaded screws is only
acceptable if two space-threaded screw are used (§28.3). In this case, no spring washer is
! k* w8 n/ U) s+ P; ?, N" Rrequired (§28.4). The use of only one space-threaded screw with spring washer is not in
, V; b) D% R% f4 M& `accordance with the standard.

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