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SIMpull 1-ft 4 -AWG Red Stranded Copper THHN wire ( By-the-foot )

Southwire SIMpull 1-ft 4 -AWG Red Stranded Copper THHN wire ( By-the-foot )

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Can this be used in conduit for underground installation?


Hello, and thank you for your question. Yes — Southwire SIMpull 4 AWG THHN is approved for underground installation as long as it is installed inside conduit. THHN by itself is not rated for direct burial, but it becomes THWN‑2 (wet‑location rated) when installed in conduit, making it fully suitable for underground runs. If you have any additional questions or feedback, please reach out to us at consumersupport@southwire.com.

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Yes, #4 THHN can be used underground in conduit as long as it is dual rated as THHN/THWN. Most THHN is dual rated, but it never hurts to double check, the markings on the insulation will provide the information.

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Yes, this can be used in conduit for underground installation.

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