Related Resources: instrumentation

Conduit Wire Fill Tables for Wires of the Same Size

Instrumentation, Electronics and Control Sensors

Conduit and Tubing Fill Tables for Wire Conductors and Fixture Wires of the Same Size

National Electrical Code wire fill for Electrical metallic tubing.

This conduit and tubing conductor fill table calculator table is provided as an informational tool and is not part of the mandatory requirements National Electrical Code. The conductor Table calculator Maximum Number of Compact Conductors fill values specified are for Rigid Conduit.

The following conductor types are covered in this table calculator

• RHH, Thermoset
• RHW, Moisture-resistant thermoset
• RHW-2, Moisture-resistant thermoset
• TW, Moisture-resistant thermoplastic
• THHW, Moisture and heat-resistant thermoplastic
• THW, Moisture and heat-resistant thermoplastic
• THW-2, Moisture and heat-resistant thermoplastic
• THHN, Heat-resistant thermoplastic
• THWN, Moisture and heat-resistant thermoplastic
• THWN-2, Moisture and heat-resistant thermoplastic
• FEP, Fluorinated ethylene propylene
• FEPB, Fluorinated ethylene propylene
• PFA, Perfluoro-alkoxy
• PFAH, Perfluoro-alkoxy
• TFE, Extended polytetra-fluoro-ethylene
• Z, Modified ethylene tetrafluoro-ethylene
• XHH, Thermoset
• XHHW, Moisture-resistant thermoset
• XHHW-2, Moisture-resistant thermoset
• ZW, Modified ethylene tetrafluoro-ethylene
• XHH, Thermoset thermoset
• XHHW, Moisture-resistant
• XHHW-2, Moisture-resistant

Reference

• National Elelctrical Code Handbook
  Mark W. Earley, P.E., Editor-in-Chief
  Jeffrey S. Sargent, Senior Editor
  Joseph V. Sheehan, P.E. Editor
  John M. Caloggero, Editor

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