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参考UL62中的定义:
2 k7 k1 r' G" x- W" B- P% vNot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade
$ O1 t0 `7 X7 n& \in mechanical serviceability.
; O% X. \! O9 U: m8 mHard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held' y6 S. F2 q/ R2 G q1 E; l
appliances and tools, classified as the medium grade in mechanical serviceability.
6 d- ?# A4 B) ^% _& B# @2 ^Extra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances
6 k# B- v1 y' h4 ?( C( M5 [/ @and tools, classified as the highest grade in mechanical serviceability. |
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