fire alarm conduit percentage of fill

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vmax dave

New User
Location
pa
Occupation
security
if the percentage of fill is 40% for fire alarm wiring on an existing system, is there anything in the code that says this percentage can increase for any new future wiring?
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
No. Many decades ago there were two percentages for wire fill in the code. There was a 25% fill for new work, and a 40% fill for re-work where additional conductors were added after the original installation.
Now there is just a 40% fill and that applies for both new and re-work.
 
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