The standard of UL attestation

Involve all phyletic products almost, it is the foundation of appraisal product. UL published a variety of 500 standards, among them 70% by association of American state level (ANSI) adopt for American state level.

1. The structure of UL standard
   Generally speaking, of UL standard can divide in structural substantially for:
   (1) the product range that standard place involves;
   (2) the structural demand of the product;
   (3) the raw material requirement that uses to product place;
   (4) the requirement of yuan of parts of an apparatus that uses to product place;
   (5) the requirement that UL lab tests an instrument to sample and test method;
   (6) the test equipment requirement to manufacturer factory and experiment method;
   (7) product mark and manual requirement.
   
   
2. Of UL standard edit
   UL standard is a file that perfects ceaselessly. Of UL standard edit the requirement is the personage that is interested by engineer of industrial group public figure, user, UL or other put forward.
   Industrial group modifies a program: When the certain content that needs modification UL standard, the requirement to the product can produce corresponding change, for this, UL made normal industry industry modify a program.
   The metropolis when publishing each UL standard to change a part announces date of expiration. Since active day, belong to UL to dog examine the related goods of the service must make corresponding change according to new requirement, so, stay between the date of expiration that the sun that revises from the standard rises to announce have enough time, so that the factory changes his product,hand over UL test again.
   After asking formally through change, edit with respect to executive industry group program. This program includes: Send the initial date of normal announcement, change to the applicant, produce tasted same method according to appraisal by UL engineer, help applicant checks a product to want modificatory part, and in revised UL factory effectively to dog a few days ago examine file.
   After new standard become effective, UL examines the delegate makes the visit the firm, by edit the part that asks to examine corresponding change.

So that get more concerns the information at UL standard,visit UL standard website please.

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