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参考UL62中的定义:
4 c/ w; S5 [6 c" n' l+ vNot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade, }9 ?# D, I: u) k3 N+ L7 }
in mechanical serviceability.
% `2 _8 |4 `/ M0 p1 }Hard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held" D- j& l, p: _; _1 O( A
appliances and tools, classified as the medium grade in mechanical serviceability.
' q# m1 [* h6 Z% yExtra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances4 I8 ]' g( Y; I8 d" x N+ F8 t4 X
and tools, classified as the highest grade in mechanical serviceability. |
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