electrician.com Racewayfill Calculator
by electrician.com
This program calculates the number of same size conductors using the .8 roundoff method. In the Auto Mode this program limits the fill to 40 per cent for over 2 conductors, 31 per cent for only two conductors, and 53 percent for one conductor. Note: THWN, THHN, and THWN-2 have the same areas. RHH, RHW, and RHW-2 without coverings and THW-2, THW, and THHW have the same areas. RH, RHH, RHW, and RHW-2 with covering have the same areas. (This program does not calculate for 3/8 inch FMC and LTFMC - Open Table 348.22 below)
Enter conductor information starting at the top of the form.
ALL AREAS ARE IN SQUARE INCHES.
Select
Insulation		Select SizeEnter No.
Conductors		Wire AreaTotal Area
(1)
(2)
(3)
(4)
(5)
Total: Grand Total Area:
Select Raceway
Select Fill Value
Auto
60 Per Cent (nipples)
25 Per Cent (sealoffs)
Minimum Raceway Size:
Allowed Raceway area:
Available Raceway area:
Maximum number of same size wires at the Per Cent Fill:
Per Cent Fill:
JAM RATIO (for 3 conductors only):
JAM RATIO between 2.8 and 3.2

To View Table 348.22 for 3/8 inch Flexible Metal and Liquidtight Flexible Metal Conduit

Open Table 348.22    Close Table 348.22