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EN60950-1:2006. W$ O/ x0 [" g/ u# j2 i
4.2.7 Stress relief test) S7 u+ i) T) K u' N. |- d2 Y* k
ENCLOSURES of moulded or formed thermoplastic materials shall be so constructed that any
. M* x. z) g- k/ d+ _, D, Dshrinkage or distortion of the material due to release of internal stresses caused by the
) s s$ |# K8 E' I J I4 _0 Gmoulding or forming operation does not result in the exposure of hazardous parts or in the
- P7 \& k% z8 e0 X4 vreduction of CLEARANCES or CREEPAGE DISTANCES below the values specified in 2.10 (or, t* U* l; k+ N5 j" o; @, j f
Annex G).
1 ~/ v' H+ b. _8 ACompliance is checked by the test procedure described below or by the inspection of the
# }& g: B0 h8 e1 Rconstruction and the available data where appropriate.1 F2 M% w4 g0 l2 `1 ]3 X2 `
One sample consisting of the complete equipment, or of the complete ENCLOSURE together
6 @) K# {: \8 }' C. E) d6 vwith any supporting framework, is placed in a circulating air oven (according to. g7 [/ q$ M! y7 H+ y# j
IEC 60216-4-1) at a temperature 10 K higher than the maximum temperature observed on the
: |+ s( K8 }. C. eENCLOSURE during the test of 4.5.2, but not less than 70 ° C, for a period of 7 h, then permitted2 L+ n6 q) o0 W7 f( M6 y" i, }
to cool to room temperature.! Q' g$ `' Y1 W9 {: T/ T0 Q( \
With the concurrence of the manufacturer, it is permitted to increase the above time duration.
( K D9 o; n K0 b' GFor large equipment where it is impractical to condition a complete ENCLOSURE, it is permitted0 |5 x$ }) c, C; s7 P3 Y
to use a portion of the ENCLOSURE representative of the complete assembly with regard to
! m. W4 D8 o; @! f4 r5 j) I1 ythickness and shape, including any mechanical support members.
1 X& a+ x7 g. vNOTE Relative humidity need not be maintained at a specific value during this test.
7 T. L! `) I2 D3 d! {: s/ e$ n6 X5 HIf the above test is conducted, the compliance criteria of 4.2.1 apply. |
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