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参考UL62中的定义:
5 H: I) j8 Y( U0 INot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade
1 Q% l, ?+ d* m0 Gin mechanical serviceability.( X6 S. d! o0 l5 j
Hard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held
& t1 [, M" b! Q2 ]1 U5 R; `appliances and tools, classified as the medium grade in mechanical serviceability.
3 Z% R0 B3 V7 _Extra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances* u/ O4 h: W- i7 X3 r) V
and tools, classified as the highest grade in mechanical serviceability. |
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