Running THHN through old steel water pipe?

[Allweather]

I am working on a circa 1900's home and its foundation has a old but still solid (and super thick) steel pipe running through the sandstone foundation that is no longer used. I am trying to add an external outlet in a 3R waterproof box to the exterior. The pipe itself is in good shape, is there any reason I couldnt use it as a metallic conduit? The walls are easily 1/4" thick on a 1/2" opening.

 

[Dennis Alwon]

Try diychatroom.com

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