Calculate Size of Conduit  

The Spreadsheet calculates the required number and size of conduits needed for 12 cables of varying sizes up to 400 sq mm. It determines that 6 conduits of 150 mm size are needed, with a maximum fill of 40% of the total conduit area. The largest cable diameter is 69.2 mm and the total area of all cables is 41814 sq mm.

Reference: Wikipedia https://en.wikipedia.org/wiki/Electrical_conduit

FAQs:

How to calculate conduit size according to NEC

Find total cables cross-sectional area: Total cables cross-sectional area = No. …
Find cross-sectional area for a suggested conduit size: Cross sectional area of a conduit = π x (conduit inner diameter/2)^2.
Find filling percentage:

How do I know my conduit size?

How to Choose the Conduit Size for Electrical Installations …
Step-by-Step Guide to Calculating Conduit Size
Determine the Total Area Required for the Wires. …
Measure the Cross-Sectional Area of the Conduit. …
Multiply the Cross-Sectional Area by the Conduit Fill Ratio. …
Compare the Maximum Fill Area with the Total Area Required.

What is the 40 percent rule for conduit?

The NEC conduit fill chart specifies these maximum conduit fill percentages: Maximum fill for one conductor is 53% of the space in the conduit. Maximum fill for two conductors is 31%. Maximum fill for more than two conductors is 40% of the conduit.

How to do conduit fill calculations?

To calculate conduit fill:
Get the 40% area value from the table corresponding to the type of conduit you’re using (Table 4).
Get the approximate area value for the size conductors you’re using (Table 5).
Divide the 40% conduit area by the conductor area, to determine the number of conductors allowed.

Title : Conduit Sizing Spredsheet For Wires & Cables

Type : Microsoft Excel Spreadsheet (xlsx)

Size : 53.0 KB