Conduit Fill

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artm

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Looking to clarify conduit fill for class 1 signaling ckts.Is 60% fill acceptable for this install.Thnx
 
The wiring methods for a class 1 circuit need to be in a Chapter three wiring method and comply with the applicable Articles of Chapter 3. (See 725.25)

Typically the conduit fill can't exceed 40% for over two conductors. Take a look at the xxx.22 sections of the conduit articles for conductor fill, these will direct you to Table 1, Chapter 9.

60% fill is only allowed for short conduit nipples less than 24" in length. (See Note 4 to Table 1, Chapter 9.)

Also pay attention to Notes (5) and (9) of Table 1, Chapter 9.

Chris
 
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