Conduit Filler

The Conduit Filler is designed to help electrical tradespeople with their conduit fill calculations and with conduit sizing for various gage of wires. Select the conduit type, conduit size and wire type you are using to find out the maximum number of allowable conductors. For conduit sizing simply select the conduit type, wire type and add the amount of wires for each gage.
New for 2024, we added a section for electricians in the United Kingdom with Conduit and Trunking calculations.
All calculations are done in accordance with the 2023 USA National Electrical Code, the 2024 Canadian Electrical Code and the British Standard BS 7671,

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