ul 1660

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That is the name of the standard under which UL evaluates the product. Any such product with a UL lable on it complies with the standard. The standard assumes the product is installed according to NEC rules.
 
minimum breaking strength of flexible coruggated conduit

minimum breaking strength of flexible coruggated conduit

What is the minimum breaking strength of flexible nonmetallic conduit (corrugated) under UL 1660?
 
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