NFPA 72

[robfree67]

According to NFPA 72, what are the differnces i wiring/conduit between style 4, 6, and 7?

Also,
According to NFPA 72 what are the differences in functionality between style 4, 6, and 7? HELP PLEASE!!!

 

[Stallzer]

Didn't NFPA 72 2010 do away with Circuit styles ? I was under the assumption they went back to Class only.

 

[nhfire77]

According to NFPA 72, what are the differnces i wiring/conduit between style 4, 6, and 7?

Also,
According to NFPA 72 what are the differences in functionality between style 4, 6, and 7? HELP PLEASE!!!

In the 2010 it's just class a or b.


Essentially:

Style 4 =class B

Style 6 = class A

Style 7= class A with isolator modules in between every device.