All questions and answers are based on the 2011 NEC.
Q. What wiring methods does the NEC permit in a Class I, Div. 2 location?
A. Only the following wiring methods are permitted within a Class I, Div. 2 location [501.10(B)(1)]:
1) Wiring methods permitted in Class I, Div. 1 locations [501.10(A)].
2) Enclosed gasketed busways and enclosed gasketed wireways.
3) PLTC and Type PLTC-ER cabl