DSH 261 Requiremwents for parts providing earth continuity

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DSH 261 / E. G5 U: z6 S1 P. S7 Q- w # A% `+ x, P3 ^9 U6 r1 V1 `; b" O

Requiremwents for parts providing earth continuity

27, 28.3, 28.4 ( ]9 g/ `- r8 J1 `5 U

60335-1(ed.3) " `; `; ^$ y# P5 g' ?/ T

Standard: IEC60335-1, Ed. 3 Sub clauses: 27, 28.3, 28.4
1 ^9 d7 C% G( M9 nSheet n. 261
1 a$ W# J5 _) X* ~( `' DSubject: Requirements for parts providing earth continuity
* u5 ^  ~7 o. gKey words:
6 R# \* F+ u. `9 A% Y- resistance to corrosion
# f" ~  G- R' r2 w- space threaded screw
Decision n. 17 taken at 35th meeting/1998
3 G; ~5 n* n9 P+ S2 q. B0 ~# FQuestions:
0 S' C; p9 `  \4 f% s8 D1. Clause 27.4 requires that parts providing earth continuity shall have adequate resistance
6 d$ `/ `/ o' {3 y9 ]to corrosion. In particular, steel parts are required to have at least 5μm electroplating
4 P) A+ X- q+ M1 L6 Z+ n2 N/ |On what basis are laboratories stating compliance for this requirement?
8 k3 Y: P  v% o. y. [2 m. s5 P2. In the instance where a space threaded screw is used to provide earthing provision for a
5 b, P+ I' S, F0 q' Xmotor frame (for instance), is the use of a space threaded screw without the use of a spring
: y6 [5 a! f- ]) \& Rwasher a satisfactory earthing method for unpainted surfaces, considering the requirements
of clauses 28.3 and 28.4, with the example of figure below ?
Decisions:
1 – The adequate thickness of electroplated coating for steel part providing earth continuity
/ @% F- V' B, Dis checked as indicated in note 4, using ISO2178 or ISO1463. The manufacturer declaration
of compliance is also accepted.
# X0 U0 b5 }  Z+ Q- b$ k2- 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
required (§28.4). The use of only one space-threaded screw with spring washer is not in
accordance with the standard.


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