ECN Forum Forums Code Related Discussion NEC & other Code issues BX..... How did it get its name?

BTW - "EMF" can also stand for Electro-Magnetic Field"

BTW, BX (Type AC) is still made - the fact that it's not used by anybody but old timers and DIY'ers is a testament to good PR and eae of use of Greenfield (FMC)! Check out the following link:
http://www.alflex.com/catalog/details/duraclad_type_ac.pdf

Cool site, and good introductory quiz!