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参考UL62中的定义:
) W: T0 z! m% }# nNot-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade
; `- o- n8 u) d7 C! sin mechanical serviceability.9 O2 o+ P: i) E4 \: j8 |( c; Z
Hard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held
9 A/ w/ [3 o2 H) Y& cappliances and tools, classified as the medium grade in mechanical serviceability.
5 m8 H$ t8 i; l( c/ y. gExtra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances
* ]: @# @: J- K- {! C% R5 eand tools, classified as the highest grade in mechanical serviceability. |
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