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参考UL62中的定义:
, k5 N# s* n6 w& l- DNot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade
4 S9 p% V7 w* z- u2 r, v' t- f! Hin mechanical serviceability.' \5 G! E* k( h' B9 k
Hard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held
, D9 D9 V5 v% p: G( W" n( aappliances and tools, classified as the medium grade in mechanical serviceability.
" m( c5 ^" O5 u1 h: D; TExtra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances
0 A2 C. x( O( C' |$ ]and tools, classified as the highest grade in mechanical serviceability. |
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