Learn about conduit fill. Find tips and information on normal, type-A and type-B liquidtight flexible metal conduit, rigid nonmetallic conduit, conduit capacity, and more. From DIY Advice.

October 23, 2017

The number of wires you can safely put into conduit without overheating is called the conduit fill. Conduit fill depends on the wire size and type and the conduit size and type. While there are hundreds of possible combinations, you're likely to use only a few -- 14-, 12-, or 10-gauge wire, in one of four or five types of conduit. Conduit fill charts describe the allowable fill for common types of conduit.

Liquidtight Flexible Metal Conduit

Liquidtight flexible metal conduit (LFMC) has a liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core.

Type-A Liquidtight Flexible Nonmetallic Conduit

Type-A liquidtight flexible nonmetallic conduit (LFNC-A) has a smooth core, a reinforcing layer, and a cover.

Type-B Liquidtight Flexible Nonmetallic Conduit

Type-B liquidtight flexible nonmetallic conduit (LFNC-B) has a core with built-in reinforcement.

Electrical Metallic Tubing

Electrical metallic tubing (EMT) is a thin-walled metal pipe.

Rigid Nonmetallic Conduit

Rigid nonmetallic conduit (RNC) is PVC conduit.

Electrical Nonmetallic Tubing

Electrical nonmetallic tubing (ENT) is flexible, corrugated PVC.


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