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NEC code for 70V audio

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utimgr

utimgr

Electrical
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Anyone familiar with the section in NEC that discusses 70V audio? I was told it was grandfathered in, such that you do not need to have it in conduit, but looking for the article number to reference that.
 
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That may be a Class 2 system and not require a raceway, but it could also be a Class 1 system. Take a look at Article 725 in the NEC.
Don
 
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