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7.2.4 Earthing terminals shall comply with the requirements of 4.7.3. The connection shall be* B. D4 u; X, d$ y3 p. y: I/ B* f
adequately locked against accidental loosening.
+ |) o; g( m+ l$ cFor screw terminals, it shall not be possible to loosen the clamping means by hand.0 e0 U% M' b- Q' g6 j9 k# O
For screwless terminals, it shall not be possible to loosen the clamping means unintentionally.3 V2 t& W6 c0 P! l4 q
Compliance is checked by inspection, by manual test and by the tests specified in 4.7.3.0 Y P" e$ q7 ~7 S3 _* [
NOTE In general, the designs commonly used for current-carrying terminals provide sufficient resilience to comply2 a Z& U& Y" J1 g
with this requirement; for other designs, special provisions, such as the use of an adequately resilient part which is7 J) k2 q# P+ s
not likely to be removed inadvertently, may be necessary.
1 y0 g' W0 N6 p% ]& HFor terminal blocks with integrated screwless earthing contacts, the additional tests of Annex V. t+ J: h" j4 `' z* O) E- O
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