UL分类，英文意思，求具体和区别，实物最好。

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Main ELBZ - Cord Sets & Power-supply Cords
Level 1 - ELDW - Cord Restraint Devices
Level 1 - ELEI - Outdoor Seasonal-use Cord-connected Wiring Devices
Level 1 - ELEV - Seasonal-use Cord Sets
Level 1 - ELFT - Utility Service Cord Sets

Main ELBZ2 - Cord Sets & Power-supply Cords - Component

Main ELBZ7 - Cord Sets & Power-supply Cords Certified for Canada
Level 1 - ELEI7 - Outdoor Seasonal-use Cord-connected Wiring Devices Certified for Canada
Level 1 - ELEV7 - Seasonal-use Cord Sets Certified for Canada