"Bronco" is kind of a code name for a type of triplex or quadruplex we use out in the oilfields for 480V overhead linework. CME is a UL listed mfr., with most, if not all it's products made south of the border (Their romex says "Proudly made in North America [Linked Image] )

here's a link http://www.cmewire.com/products/ix600sdc.asp

Funny though... they list the 336.4 as "NannyNose" [Linked Image]

BTW... I dont think this is made for in the home use