Question?
Article 336.26 states that type "NM" cable must be amperage rated using the 60c column on table 310.16
Article 336-30.(b) states that NM cable having the "-B" extension have their conductors insulation rated at 90c.
If I have a 200 amp main panel feeding a subpanel and both terminal ratings (on the breaker and lugs on the subpanel)are rated @ 75c, can I use 6-3 NM-B romex as the subfeeder conductors using a 70 amp breaker in the main panel?
Thanx..
Curtis
