Free guide to sizing conduit for cable

17 October 2019

Essentra Components Ltdvisit website


Calculating conduit fill is an essential part of any large-scale electrical installation – Essentra Components is delighted to offer a free guide to assist installers. The Essentra Components guide explains that conduit fill, also known as raceway fill, is the amount of a conduit’s cross-sectional area occupied, or filled, by a cable or multiple cables. The fill is based on the cable outside diameter (OD) and the conduit inside diameter (ID).

Determining cable conduit fill is critical for complying with the requirements of the National Electrical Code (NEC). Failing to do this correctly can lead to expensive and time-consuming rewiring at the very least, and at most, an electrical installation that is dangerous.

Other important factors to consider for a safety and best practice include conduit material choice, conduit size, calculating a cross-section and more, all covered in the guide.

Further information about Essentra Components and its products can be found at, and the guide can be accessed here.

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